[apple/cf.git] / CFRunLoop.c

/*
 * Copyright (c) 2008 Apple Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*      CFRunLoop.c
        Copyright 1998-2002, Apple, Inc. All rights reserved.
        Responsibility: Christopher Kane
*/

#if (DEPLOYMENT_TARGET_MACOSX) || defined(__WIN32__)

#include <CoreFoundation/CFRunLoop.h>
#include <CoreFoundation/CFSet.h>
#include <CoreFoundation/CFBag.h>
#include "CFInternal.h"
#include <math.h>
#include <stdio.h>
#include <limits.h>
#if DEPLOYMENT_TARGET_MACOSX
#include <mach/mach.h>
#include <mach/clock_types.h>
#include <mach/clock.h>
#include <unistd.h>
#include <dlfcn.h>
#else
#if !defined(__MINGW32__) && !defined(__CYGWIN__)
// With the MS headers, turning off Standard-C gets you macros for stat vs _stat.
// Strictly speaking, this is supposed to control traditional vs ANSI C features.
#undef __STDC__
#endif
#include <windows.h>
#include <pthread.h>
#include <process.h>
#if !defined(__MINGW32__) && !defined(__CYGWIN__)
#define __STDC__
#endif
#endif

static int _LogCFRunLoop = 0;

#if 0 || 0
static pthread_t kNilPthreadT = { nil, nil };
#define pthreadPointer(a) a.p
#define lockCount(a) a.LockCount
#else
static pthread_t kNilPthreadT = (pthread_t)0;
#define pthreadPointer(a) a
#define lockCount(a) a
#endif


#if DEPLOYMENT_TARGET_MACOSX
#include <sys/types.h>
#include <sys/event.h>

typedef struct {
    CFIndex     version;
    void *      info;
    const void *(*retain)(const void *info);
    void        (*release)(const void *info);
    CFStringRef (*copyDescription)(const void *info);
    Boolean     (*equal)(const void *info1, const void *info2);
    CFHashCode  (*hash)(const void *info);
    void        (*perform)(const struct kevent *kev, void *info);
    struct kevent event;
} CFRunLoopSourceContext2;

// The bits in the flags field in the kevent structure are cleared except for EV_ONESHOT and EV_CLEAR.
// Do not use the udata field of the kevent structure -- that field is smashed by CFRunLoop.
// There is no way to EV_ENABLE or EV_DISABLE a kevent.
// The "autoinvalidation" of EV_ONESHOT is not handled properly by CFRunLoop yet.
// The "autoinvalidation" of EV_DELETE on the last close of a file descriptor is not handled properly by CFRunLoop yet.
// There is no way to reset the state in a kevent (such as clearing the EV_EOF state for fifos).
#endif

extern bool CFDictionaryGetKeyIfPresent(CFDictionaryRef dict, const void *key, const void **actualkey);

// In order to reuse most of the code across Mach and Windows v1 RunLoopSources, we define a
// simple abstraction layer spanning Mach ports and Windows HANDLES
#if DEPLOYMENT_TARGET_MACOSX

typedef mach_port_t __CFPort;
#define CFPORT_NULL MACH_PORT_NULL
typedef mach_port_t __CFPortSet;

static __CFPort __CFPortAllocate(void) {
    __CFPort result;
    kern_return_t ret;
    ret = mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &result);
    if (KERN_SUCCESS == ret) {
        ret = mach_port_insert_right(mach_task_self(), result, result, MACH_MSG_TYPE_MAKE_SEND);
    }
    if (KERN_SUCCESS == ret) {
        mach_port_limits_t limits;
        limits.mpl_qlimit = 1;
        ret = mach_port_set_attributes(mach_task_self(), result, MACH_PORT_LIMITS_INFO, (mach_port_info_t)&limits, MACH_PORT_LIMITS_INFO_COUNT);
    }
    return (KERN_SUCCESS == ret) ? result : CFPORT_NULL;
}

CF_INLINE void __CFPortFree(__CFPort port) {
    mach_port_destroy(mach_task_self(), port);
}

CF_INLINE __CFPortSet __CFPortSetAllocate(void) {
    __CFPortSet result;
    kern_return_t ret = mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_PORT_SET, &result);
    return (KERN_SUCCESS == ret) ? result : CFPORT_NULL;
}

CF_INLINE Boolean __CFPortSetInsert(__CFPort port, __CFPortSet portSet) {
    kern_return_t ret = mach_port_insert_member(mach_task_self(), port, portSet);
    return (KERN_SUCCESS == ret);
}

CF_INLINE Boolean __CFPortSetRemove(__CFPort port, __CFPortSet portSet) {
    kern_return_t ret = mach_port_extract_member(mach_task_self(), port, portSet);
    return (KERN_SUCCESS == ret);
}

CF_INLINE void __CFPortSetFree(__CFPortSet portSet) {
    kern_return_t ret;
    mach_port_name_array_t array;
    mach_msg_type_number_t idx, number;

    ret = mach_port_get_set_status(mach_task_self(), portSet, &array, &number);
    if (KERN_SUCCESS == ret) {
        for (idx = 0; idx < number; idx++) {
            mach_port_extract_member(mach_task_self(), array[idx], portSet);
        }
        vm_deallocate(mach_task_self(), (vm_address_t)array, number * sizeof(mach_port_name_t));
    }
    mach_port_destroy(mach_task_self(), portSet);
}

#elif defined(__WIN32__)

typedef HANDLE __CFPort;
#define CFPORT_NULL NULL

// A simple dynamic array of HANDLEs, which grows to a high-water mark
typedef struct ___CFPortSet {
    uint16_t    used;
    uint16_t    size;
    HANDLE      *handles;
    CFSpinLock_t lock;          // insert and remove must be thread safe, like the Mach calls
} *__CFPortSet;

CF_INLINE __CFPort __CFPortAllocate(void) {
    return CreateEvent(NULL, true, false, NULL);
}

CF_INLINE void __CFPortFree(__CFPort port) {
    CloseHandle(port);
}

static __CFPortSet __CFPortSetAllocate(void) {
    __CFPortSet result = CFAllocatorAllocate(kCFAllocatorSystemDefault, sizeof(struct ___CFPortSet), 0);
    result->used = 0;
    result->size = 4;
    result->handles = CFAllocatorAllocate(kCFAllocatorSystemDefault, result->size * sizeof(HANDLE), 0);
    CF_SPINLOCK_INIT_FOR_STRUCTS(result->lock);
    return result;
}

static void __CFPortSetFree(__CFPortSet portSet) {
    CFAllocatorDeallocate(kCFAllocatorSystemDefault, portSet->handles);
    CFAllocatorDeallocate(kCFAllocatorSystemDefault, portSet);
}

// Returns portBuf if ports fit in that space, else returns another ptr that must be freed
static __CFPort *__CFPortSetGetPorts(__CFPortSet portSet, __CFPort *portBuf, uint32_t bufSize, uint32_t *portsUsed) {
    __CFSpinLock(&(portSet->lock));
    __CFPort *result = portBuf;
    if (bufSize > portSet->used)
        result = CFAllocatorAllocate(kCFAllocatorSystemDefault, portSet->used * sizeof(HANDLE), 0);
    memmove(result, portSet->handles, portSet->used * sizeof(HANDLE));
    *portsUsed = portSet->used;
    __CFSpinUnlock(&(portSet->lock));
    return result;
}

static Boolean __CFPortSetInsert(__CFPort port, __CFPortSet portSet) {
    __CFSpinLock(&(portSet->lock));
    if (portSet->used >= portSet->size) {
        portSet->size += 4;
        portSet->handles = CFAllocatorReallocate(kCFAllocatorSystemDefault, portSet->handles, portSet->size * sizeof(HANDLE), 0);
    }
    if (portSet->used >= MAXIMUM_WAIT_OBJECTS)
        CFLog(kCFLogLevelWarning, CFSTR("*** More than MAXIMUM_WAIT_OBJECTS (%d) ports add to a port set.  The last ones will be ignored."), MAXIMUM_WAIT_OBJECTS);
    portSet->handles[portSet->used++] = port;
    __CFSpinUnlock(&(portSet->lock));
    return true;
}

static Boolean __CFPortSetRemove(__CFPort port, __CFPortSet portSet) {
    int i, j;
    __CFSpinLock(&(portSet->lock));
    for (i = 0; i < portSet->used; i++) {
        if (portSet->handles[i] == port) {
            for (j = i+1; j < portSet->used; j++) {
                portSet->handles[j-1] = portSet->handles[j];
            }
            portSet->used--;
            __CFSpinUnlock(&(portSet->lock));
            return true;
        }
    }
    __CFSpinUnlock(&(portSet->lock));
    return false;
}

#endif

#if DEPLOYMENT_TARGET_MACOSX
extern mach_port_name_t mk_timer_create(void);
extern kern_return_t mk_timer_destroy(mach_port_name_t name);
extern kern_return_t mk_timer_arm(mach_port_name_t name, AbsoluteTime expire_time);
extern kern_return_t mk_timer_cancel(mach_port_name_t name, AbsoluteTime *result_time);

CF_INLINE AbsoluteTime __CFUInt64ToAbsoluteTime(int64_t x) {
    AbsoluteTime a;
    a.hi = x >> 32;
    a.lo = x & (int64_t)0xFFFFFFFF;
    return a;
}

static uint32_t __CFSendTrivialMachMessage(mach_port_t port, uint32_t msg_id, CFOptionFlags options, uint32_t timeout) {
    kern_return_t result;
    mach_msg_header_t header;
    header.msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, 0);
    header.msgh_size = sizeof(mach_msg_header_t);
    header.msgh_remote_port = port;
    header.msgh_local_port = MACH_PORT_NULL;
    header.msgh_id = msg_id;
    result = mach_msg(&header, MACH_SEND_MSG|options, header.msgh_size, 0, MACH_PORT_NULL, timeout, MACH_PORT_NULL);
    if (result == MACH_SEND_TIMED_OUT) mach_msg_destroy(&header);
    return result;
}
#endif

/* unlock a run loop and modes before doing callouts/sleeping */
/* never try to take the run loop lock with a mode locked */
/* be very careful of common subexpression elimination and compacting code, particular across locks and unlocks! */
/* run loop mode structures should never be deallocated, even if they become empty */

static CFTypeID __kCFRunLoopModeTypeID = _kCFRuntimeNotATypeID;
static CFTypeID __kCFRunLoopTypeID = _kCFRuntimeNotATypeID;
static CFTypeID __kCFRunLoopSourceTypeID = _kCFRuntimeNotATypeID;
static CFTypeID __kCFRunLoopObserverTypeID = _kCFRuntimeNotATypeID;
static CFTypeID __kCFRunLoopTimerTypeID = _kCFRuntimeNotATypeID;

typedef struct __CFRunLoopMode *CFRunLoopModeRef;

struct __CFRunLoopMode {
    CFRuntimeBase _base;
    CFSpinLock_t _lock; /* must have the run loop locked before locking this */
    CFStringRef _name;
    Boolean _stopped;
    char _padding[3];
    CFMutableSetRef _sources;
    CFMutableSetRef _observers;
    CFMutableSetRef _timers;
    CFMutableArrayRef _submodes; // names of the submodes
    __CFPortSet _portSet;
#if DEPLOYMENT_TARGET_MACOSX
    int _kq;
#endif
};

static int64_t __CFRunLoopGetNextTimerFireTSR(CFRunLoopRef rl, CFRunLoopModeRef rlm);

CF_INLINE void __CFRunLoopModeLock(CFRunLoopModeRef rlm) {
    __CFSpinLock(&(rlm->_lock));
}

CF_INLINE void __CFRunLoopModeUnlock(CFRunLoopModeRef rlm) {
    __CFSpinUnlock(&(rlm->_lock));
}

static Boolean __CFRunLoopModeEqual(CFTypeRef cf1, CFTypeRef cf2) {
    CFRunLoopModeRef rlm1 = (CFRunLoopModeRef)cf1;
    CFRunLoopModeRef rlm2 = (CFRunLoopModeRef)cf2;
    return CFEqual(rlm1->_name, rlm2->_name);
}

static CFHashCode __CFRunLoopModeHash(CFTypeRef cf) {
    CFRunLoopModeRef rlm = (CFRunLoopModeRef)cf;
    return CFHash(rlm->_name);
}

static CFStringRef __CFRunLoopModeCopyDescription(CFTypeRef cf) {
    CFRunLoopModeRef rlm = (CFRunLoopModeRef)cf;
    CFMutableStringRef result;
    result = CFStringCreateMutable(kCFAllocatorSystemDefault, 0);
    CFStringAppendFormat(result, NULL, CFSTR("<CFRunLoopMode %p [%p]>{name = %@, locked = %s, "), rlm, CFGetAllocator(rlm), rlm->_name, lockCount(rlm->_lock) ? "true" : "false");
    CFStringAppendFormat(result, NULL, CFSTR("port set = %p,"), rlm->_portSet);
    CFStringAppendFormat(result, NULL, CFSTR("\n\tsources = %@,\n\tobservers == %@,\n\ttimers = %@\n},\n"), rlm->_sources, rlm->_observers, rlm->_timers);
    return result;
}

static void __CFRunLoopModeDeallocate(CFTypeRef cf) {
    CFRunLoopModeRef rlm = (CFRunLoopModeRef)cf;
    if (NULL != rlm->_sources) CFRelease(rlm->_sources);
    if (NULL != rlm->_observers) CFRelease(rlm->_observers);
    if (NULL != rlm->_timers) CFRelease(rlm->_timers);
    if (NULL != rlm->_submodes) CFRelease(rlm->_submodes);
    CFRelease(rlm->_name);
    __CFPortSetFree(rlm->_portSet);
#if DEPLOYMENT_TARGET_MACOSX
    if (-1 != rlm->_kq) close(rlm->_kq);
#endif
}

struct __CFRunLoop {
    CFRuntimeBase _base;
    CFSpinLock_t _lock;                 /* locked for accessing mode list */
    __CFPort _wakeUpPort;                       // used for CFRunLoopWakeUp 
    volatile uint32_t *_stopped;
    CFMutableSetRef _commonModes;
    CFMutableSetRef _commonModeItems;
    CFRunLoopModeRef _currentMode;
    CFMutableSetRef _modes;
    void *_counterpart;
};

/* Bit 0 of the base reserved bits is used for stopped state */
/* Bit 1 of the base reserved bits is used for sleeping state */
/* Bit 2 of the base reserved bits is used for deallocating state */

CF_INLINE Boolean __CFRunLoopIsStopped(CFRunLoopRef rl) {
    return (rl->_stopped && rl->_stopped[2]) ? true : false;
}

CF_INLINE void __CFRunLoopSetStopped(CFRunLoopRef rl) {
    if (rl->_stopped) rl->_stopped[2] = 0x53544F50;     // 'STOP'
}

CF_INLINE void __CFRunLoopUnsetStopped(CFRunLoopRef rl) {
    if (rl->_stopped) rl->_stopped[2] = 0x0;
}

CF_INLINE Boolean __CFRunLoopIsSleeping(CFRunLoopRef rl) {
    return (Boolean)__CFBitfieldGetValue(((const CFRuntimeBase *)rl)->_cfinfo[CF_INFO_BITS], 1, 1);
}

CF_INLINE void __CFRunLoopSetSleeping(CFRunLoopRef rl) {
    __CFBitfieldSetValue(((CFRuntimeBase *)rl)->_cfinfo[CF_INFO_BITS], 1, 1, 1);
}

CF_INLINE void __CFRunLoopUnsetSleeping(CFRunLoopRef rl) {
    __CFBitfieldSetValue(((CFRuntimeBase *)rl)->_cfinfo[CF_INFO_BITS], 1, 1, 0);
}

CF_INLINE Boolean __CFRunLoopIsDeallocating(CFRunLoopRef rl) {
    return (Boolean)__CFBitfieldGetValue(((const CFRuntimeBase *)rl)->_cfinfo[CF_INFO_BITS], 2, 2);
}

CF_INLINE void __CFRunLoopSetDeallocating(CFRunLoopRef rl) {
    __CFBitfieldSetValue(((CFRuntimeBase *)rl)->_cfinfo[CF_INFO_BITS], 2, 2, 1);
}

CF_INLINE void __CFRunLoopLock(CFRunLoopRef rl) {
    __CFSpinLock(&(((CFRunLoopRef)rl)->_lock));
}

CF_INLINE void __CFRunLoopUnlock(CFRunLoopRef rl) {
    __CFSpinUnlock(&(((CFRunLoopRef)rl)->_lock));
}

static CFStringRef __CFRunLoopCopyDescription(CFTypeRef cf) {
    CFRunLoopRef rl = (CFRunLoopRef)cf;
    CFMutableStringRef result;
    result = CFStringCreateMutable(kCFAllocatorSystemDefault, 0);
    CFStringAppendFormat(result, NULL, CFSTR("<CFRunLoop %p [%p]>{locked = %s, wait port = 0x%x, stopped = %s,\ncurrent mode = %@,\n"), cf, CFGetAllocator(cf), lockCount(rl->_lock) ? "true" : "false", rl->_wakeUpPort, (rl->_stopped && (rl->_stopped[2] == 0x53544F50)) ? "true" : "false", rl->_currentMode ? rl->_currentMode->_name : CFSTR("(none)"));
    CFStringAppendFormat(result, NULL, CFSTR("common modes = %@,\ncommon mode items = %@,\nmodes = %@}\n"), rl->_commonModes, rl->_commonModeItems, rl->_modes);
    return result;
}

/* call with rl locked */
static CFRunLoopModeRef __CFRunLoopFindMode(CFRunLoopRef rl, CFStringRef modeName, Boolean create) {
    CHECK_FOR_FORK();
    CFRunLoopModeRef rlm;
    struct __CFRunLoopMode srlm;
    srlm._base._cfisa = __CFISAForTypeID(__kCFRunLoopModeTypeID);
    srlm._base._cfinfo[CF_INFO_BITS] = 0;
    _CFRuntimeSetInstanceTypeID(&srlm, __kCFRunLoopModeTypeID);
    srlm._name = modeName;
    rlm = (CFRunLoopModeRef)CFSetGetValue(rl->_modes, &srlm);
    if (NULL != rlm) {
        __CFRunLoopModeLock(rlm);
        return rlm;
    }
    if (!create) {
        return NULL;
    }
    rlm = (CFRunLoopModeRef)_CFRuntimeCreateInstance(CFGetAllocator(rl), __kCFRunLoopModeTypeID, sizeof(struct __CFRunLoopMode) - sizeof(CFRuntimeBase), NULL);
    if (NULL == rlm) {
        return NULL;
    }
    CF_SPINLOCK_INIT_FOR_STRUCTS(rlm->_lock);
    rlm->_name = CFStringCreateCopy(CFGetAllocator(rlm), modeName);
    rlm->_stopped = false;
    rlm->_sources = NULL;
    rlm->_observers = NULL;
    rlm->_timers = NULL;
    rlm->_submodes = NULL;
    rlm->_portSet = __CFPortSetAllocate();
    if (CFPORT_NULL == rlm->_portSet) HALT;
    if (!__CFPortSetInsert(rl->_wakeUpPort, rlm->_portSet)) HALT;
#if DEPLOYMENT_TARGET_MACOSX
    rlm->_kq = -1;
#endif
    CFSetAddValue(rl->_modes, rlm);
    CFRelease(rlm);
    __CFRunLoopModeLock(rlm);   /* return mode locked */
    return rlm;
}


// expects rl and rlm locked
static Boolean __CFRunLoopModeIsEmpty(CFRunLoopRef rl, CFRunLoopModeRef rlm) {
    CHECK_FOR_FORK();
    if (NULL == rlm) return true;
    if (NULL != rlm->_sources && 0 < CFSetGetCount(rlm->_sources)) return false;
    if (NULL != rlm->_timers && 0 < CFSetGetCount(rlm->_timers)) return false;
    if (NULL != rlm->_submodes) {
        CFIndex idx, cnt;
        for (idx = 0, cnt = CFArrayGetCount(rlm->_submodes); idx < cnt; idx++) {
            CFStringRef modeName = (CFStringRef)CFArrayGetValueAtIndex(rlm->_submodes, idx);
            CFRunLoopModeRef subrlm;
            Boolean subIsEmpty;
            subrlm = __CFRunLoopFindMode(rl, modeName, false);
            subIsEmpty = (NULL != subrlm) ? __CFRunLoopModeIsEmpty(rl, subrlm) : true;
            if (NULL != subrlm) __CFRunLoopModeUnlock(subrlm);
            if (!subIsEmpty) return false;
        }
    }
    return true;
}

/* Bit 3 in the base reserved bits is used for invalid state in run loop objects */

CF_INLINE Boolean __CFIsValid(const void *cf) {
    return (Boolean)__CFBitfieldGetValue(((const CFRuntimeBase *)cf)->_cfinfo[CF_INFO_BITS], 3, 3);
}

CF_INLINE void __CFSetValid(void *cf) {
    __CFBitfieldSetValue(((CFRuntimeBase *)cf)->_cfinfo[CF_INFO_BITS], 3, 3, 1);
}

CF_INLINE void __CFUnsetValid(void *cf) {
    __CFBitfieldSetValue(((CFRuntimeBase *)cf)->_cfinfo[CF_INFO_BITS], 3, 3, 0);
}

struct __CFRunLoopSource {
    CFRuntimeBase _base;
    uint32_t _bits;
    CFSpinLock_t _lock;
    CFIndex _order;                     /* immutable */
    CFMutableBagRef _runLoops;
    union {
        CFRunLoopSourceContext version0;        /* immutable, except invalidation */
        CFRunLoopSourceContext1 version1;       /* immutable, except invalidation */
    } _context;
};

/* Bit 1 of the base reserved bits is used for signalled state */

CF_INLINE Boolean __CFRunLoopSourceIsSignaled(CFRunLoopSourceRef rls) {
    return (Boolean)__CFBitfieldGetValue(rls->_bits, 1, 1);
}

CF_INLINE void __CFRunLoopSourceSetSignaled(CFRunLoopSourceRef rls) {
    __CFBitfieldSetValue(rls->_bits, 1, 1, 1);
}

CF_INLINE void __CFRunLoopSourceUnsetSignaled(CFRunLoopSourceRef rls) {
    __CFBitfieldSetValue(rls->_bits, 1, 1, 0);
}

CF_INLINE void __CFRunLoopSourceLock(CFRunLoopSourceRef rls) {
    __CFSpinLock(&(rls->_lock));
}

CF_INLINE void __CFRunLoopSourceUnlock(CFRunLoopSourceRef rls) {
    __CFSpinUnlock(&(rls->_lock));
}

/* rlm is not locked */
static void __CFRunLoopSourceSchedule(CFRunLoopSourceRef rls, CFRunLoopRef rl, CFRunLoopModeRef rlm) {  /* DOES CALLOUT */
    __CFRunLoopSourceLock(rls);
    if (NULL == rls->_runLoops) {
        rls->_runLoops = CFBagCreateMutable(kCFAllocatorSystemDefault, 0, NULL);
    }
    CFBagAddValue(rls->_runLoops, rl);
    __CFRunLoopSourceUnlock(rls);       // have to unlock before the callout -- cannot help clients with safety
    if (0 == rls->_context.version0.version) {
        if (NULL != rls->_context.version0.schedule) {
            rls->_context.version0.schedule(rls->_context.version0.info, rl, rlm->_name);
        }
    } else if (1 == rls->_context.version0.version) {
        __CFPort port = rls->_context.version1.getPort(rls->_context.version1.info);    /* CALLOUT */
        if (CFPORT_NULL != port) {
            __CFPortSetInsert(port, rlm->_portSet);
        }
    }
}

/* rlm is not locked */
static void __CFRunLoopSourceCancel(CFRunLoopSourceRef rls, CFRunLoopRef rl, CFRunLoopModeRef rlm) {    /* DOES CALLOUT */
    if (0 == rls->_context.version0.version) {
        if (NULL != rls->_context.version0.cancel) {
            rls->_context.version0.cancel(rls->_context.version0.info, rl, rlm->_name); /* CALLOUT */
        }
    } else if (1 == rls->_context.version0.version) {
        __CFPort port = rls->_context.version1.getPort(rls->_context.version1.info);    /* CALLOUT */
        if (CFPORT_NULL != port) {
            __CFPortSetRemove(port, rlm->_portSet);
        }
    }
    __CFRunLoopSourceLock(rls);
    if (NULL != rls->_runLoops) {
        CFBagRemoveValue(rls->_runLoops, rl);
    }
    __CFRunLoopSourceUnlock(rls);
}

struct __CFRunLoopObserver {
    CFRuntimeBase _base;
    CFSpinLock_t _lock;
    CFRunLoopRef _runLoop;
    CFIndex _rlCount;
    CFOptionFlags _activities;          /* immutable */
    CFIndex _order;                     /* immutable */
    CFRunLoopObserverCallBack _callout; /* immutable */
    CFRunLoopObserverContext _context;  /* immutable, except invalidation */
};

/* Bit 0 of the base reserved bits is used for firing state */
/* Bit 1 of the base reserved bits is used for repeats state */

CF_INLINE Boolean __CFRunLoopObserverIsFiring(CFRunLoopObserverRef rlo) {
    return (Boolean)__CFBitfieldGetValue(((const CFRuntimeBase *)rlo)->_cfinfo[CF_INFO_BITS], 0, 0);
}

CF_INLINE void __CFRunLoopObserverSetFiring(CFRunLoopObserverRef rlo) {
    __CFBitfieldSetValue(((CFRuntimeBase *)rlo)->_cfinfo[CF_INFO_BITS], 0, 0, 1);
}

CF_INLINE void __CFRunLoopObserverUnsetFiring(CFRunLoopObserverRef rlo) {
    __CFBitfieldSetValue(((CFRuntimeBase *)rlo)->_cfinfo[CF_INFO_BITS], 0, 0, 0);
}

CF_INLINE Boolean __CFRunLoopObserverRepeats(CFRunLoopObserverRef rlo) {
    return (Boolean)__CFBitfieldGetValue(((const CFRuntimeBase *)rlo)->_cfinfo[CF_INFO_BITS], 1, 1);
}

CF_INLINE void __CFRunLoopObserverSetRepeats(CFRunLoopObserverRef rlo) {
    __CFBitfieldSetValue(((CFRuntimeBase *)rlo)->_cfinfo[CF_INFO_BITS], 1, 1, 1);
}

CF_INLINE void __CFRunLoopObserverUnsetRepeats(CFRunLoopObserverRef rlo) {
    __CFBitfieldSetValue(((CFRuntimeBase *)rlo)->_cfinfo[CF_INFO_BITS], 1, 1, 0);
}

CF_INLINE void __CFRunLoopObserverLock(CFRunLoopObserverRef rlo) {
    __CFSpinLock(&(rlo->_lock));
}

CF_INLINE void __CFRunLoopObserverUnlock(CFRunLoopObserverRef rlo) {
    __CFSpinUnlock(&(rlo->_lock));
}

static void __CFRunLoopObserverSchedule(CFRunLoopObserverRef rlo, CFRunLoopRef rl, CFRunLoopModeRef rlm) {
    __CFRunLoopObserverLock(rlo);
    if (0 == rlo->_rlCount) {
        rlo->_runLoop = rl;
    }
    rlo->_rlCount++;
    __CFRunLoopObserverUnlock(rlo);
}

static void __CFRunLoopObserverCancel(CFRunLoopObserverRef rlo, CFRunLoopRef rl, CFRunLoopModeRef rlm) {
    __CFRunLoopObserverLock(rlo);
    rlo->_rlCount--;
    if (0 == rlo->_rlCount) {
        rlo->_runLoop = NULL;
    }
    __CFRunLoopObserverUnlock(rlo);
}

struct __CFRunLoopTimer {
    CFRuntimeBase _base;
    CFSpinLock_t _lock;
    CFRunLoopRef _runLoop;
    CFIndex _rlCount;
#if DEPLOYMENT_TARGET_MACOSX
    mach_port_name_t _port;
#endif
    CFIndex _order;                     /* immutable */
    int64_t _fireTSR;                   /* TSR units */
    int64_t _intervalTSR;               /* immutable; 0 means non-repeating; TSR units */
    CFRunLoopTimerCallBack _callout;    /* immutable */
    CFRunLoopTimerContext _context;     /* immutable, except invalidation */
};

/* Bit 0 of the base reserved bits is used for firing state */
/* Bit 1 of the base reserved bits is used for fired-during-callout state */

CF_INLINE Boolean __CFRunLoopTimerIsFiring(CFRunLoopTimerRef rlt) {
    return (Boolean)__CFBitfieldGetValue(((const CFRuntimeBase *)rlt)->_cfinfo[CF_INFO_BITS], 0, 0);
}

CF_INLINE void __CFRunLoopTimerSetFiring(CFRunLoopTimerRef rlt) {
    __CFBitfieldSetValue(((CFRuntimeBase *)rlt)->_cfinfo[CF_INFO_BITS], 0, 0, 1);
}

CF_INLINE void __CFRunLoopTimerUnsetFiring(CFRunLoopTimerRef rlt) {
    __CFBitfieldSetValue(((CFRuntimeBase *)rlt)->_cfinfo[CF_INFO_BITS], 0, 0, 0);
}

CF_INLINE Boolean __CFRunLoopTimerDidFire(CFRunLoopTimerRef rlt) {
    return (Boolean)__CFBitfieldGetValue(((const CFRuntimeBase *)rlt)->_cfinfo[CF_INFO_BITS], 1, 1);
}

CF_INLINE void __CFRunLoopTimerSetDidFire(CFRunLoopTimerRef rlt) {
    __CFBitfieldSetValue(((CFRuntimeBase *)rlt)->_cfinfo[CF_INFO_BITS], 1, 1, 1);
}

CF_INLINE void __CFRunLoopTimerUnsetDidFire(CFRunLoopTimerRef rlt) {
    __CFBitfieldSetValue(((CFRuntimeBase *)rlt)->_cfinfo[CF_INFO_BITS], 1, 1, 0);
}

CF_INLINE void __CFRunLoopTimerLock(CFRunLoopTimerRef rlt) {
    __CFSpinLock(&(rlt->_lock));
}

CF_INLINE void __CFRunLoopTimerUnlock(CFRunLoopTimerRef rlt) {
    __CFSpinUnlock(&(rlt->_lock));
}

static CFSpinLock_t __CFRLTFireTSRLock = CFSpinLockInit;

CF_INLINE void __CFRunLoopTimerFireTSRLock(void) {
    __CFSpinLock(&__CFRLTFireTSRLock);
}

CF_INLINE void __CFRunLoopTimerFireTSRUnlock(void) {
    __CFSpinUnlock(&__CFRLTFireTSRLock);
}

#if DEPLOYMENT_TARGET_MACOSX
static CFMutableDictionaryRef __CFRLTPortMap = NULL;
static CFSpinLock_t __CFRLTPortMapLock = CFSpinLockInit;

CF_INLINE void __CFRunLoopTimerPortMapLock(void) {
    __CFSpinLock(&__CFRLTPortMapLock);
}

CF_INLINE void __CFRunLoopTimerPortMapUnlock(void) {
    __CFSpinUnlock(&__CFRLTPortMapLock);
}
#endif

static void __CFRunLoopTimerSchedule(CFRunLoopTimerRef rlt, CFRunLoopRef rl, CFRunLoopModeRef rlm) {
#if DEPLOYMENT_TARGET_MACOSX
    __CFRunLoopTimerLock(rlt);
    if (0 == rlt->_rlCount) {
        rlt->_runLoop = rl;
        if (MACH_PORT_NULL == rlt->_port) {
            rlt->_port = mk_timer_create();
        }
        __CFRunLoopTimerPortMapLock();
        if (NULL == __CFRLTPortMap) {
            __CFRLTPortMap = CFDictionaryCreateMutable(kCFAllocatorSystemDefault, 0, NULL, NULL);
        }
        CFDictionarySetValue(__CFRLTPortMap, (void *)(uintptr_t)rlt->_port, rlt);
        __CFRunLoopTimerPortMapUnlock();
    }
    rlt->_rlCount++;
    mach_port_insert_member(mach_task_self(), rlt->_port, rlm->_portSet);
    mk_timer_arm(rlt->_port, __CFUInt64ToAbsoluteTime(rlt->_fireTSR));
    __CFRunLoopTimerUnlock(rlt);
#endif
}

static void __CFRunLoopTimerCancel(CFRunLoopTimerRef rlt, CFRunLoopRef rl, CFRunLoopModeRef rlm) {
#if DEPLOYMENT_TARGET_MACOSX
    __CFRunLoopTimerLock(rlt);
    __CFPortSetRemove(rlt->_port, rlm->_portSet);
    rlt->_rlCount--;
    if (0 == rlt->_rlCount) {
        __CFRunLoopTimerPortMapLock();
        if (NULL != __CFRLTPortMap) {
            CFDictionaryRemoveValue(__CFRLTPortMap, (void *)(uintptr_t)rlt->_port);
        }
        __CFRunLoopTimerPortMapUnlock();
        rlt->_runLoop = NULL;
        mk_timer_cancel(rlt->_port, NULL);
    }
    __CFRunLoopTimerUnlock(rlt);
#endif
}

// Caller must hold the Timer lock for safety
static void __CFRunLoopTimerRescheduleWithAllModes(CFRunLoopTimerRef rlt, CFRunLoopRef rl) {
#if DEPLOYMENT_TARGET_MACOSX
    mk_timer_arm(rlt->_port, __CFUInt64ToAbsoluteTime(rlt->_fireTSR));
#endif
}

/* CFRunLoop */

CONST_STRING_DECL(kCFRunLoopDefaultMode, "kCFRunLoopDefaultMode")
CONST_STRING_DECL(kCFRunLoopCommonModes, "kCFRunLoopCommonModes")

struct _findsource {
    __CFPort port;
    CFRunLoopSourceRef result;
};

static void __CFRunLoopFindSource(const void *value, void *ctx) {
    CFRunLoopSourceRef rls = (CFRunLoopSourceRef)value;
    struct _findsource *context = (struct _findsource *)ctx;
    __CFPort port;
    if (NULL != context->result) return;
    if (1 != rls->_context.version0.version) return;
    __CFRunLoopSourceLock(rls);
    port = rls->_context.version1.getPort(rls->_context.version1.info);
    if (port == context->port) {
        context->result = rls;
    }
    __CFRunLoopSourceUnlock(rls);
}

// call with rl and rlm locked
static CFRunLoopSourceRef __CFRunLoopModeFindSourceForMachPort(CFRunLoopRef rl, CFRunLoopModeRef rlm, __CFPort port) {  /* DOES CALLOUT */
    CHECK_FOR_FORK();
    struct _findsource context = {port, NULL};
    if (NULL != rlm->_sources) {
        CFSetApplyFunction(rlm->_sources, (__CFRunLoopFindSource), &context);
    }
    if (NULL == context.result && NULL != rlm->_submodes) {
        CFIndex idx, cnt;
        for (idx = 0, cnt = CFArrayGetCount(rlm->_submodes); idx < cnt; idx++) {
            CFRunLoopSourceRef source = NULL;
            CFStringRef modeName = (CFStringRef)CFArrayGetValueAtIndex(rlm->_submodes, idx);
            CFRunLoopModeRef subrlm;
            subrlm = __CFRunLoopFindMode(rl, modeName, false);
            if (NULL != subrlm) {
                source = __CFRunLoopModeFindSourceForMachPort(rl, subrlm, port);
                __CFRunLoopModeUnlock(subrlm);
            }
            if (NULL != source) {
                context.result = source;
                break;
            }
        }
    }
    return context.result;
}

#if DEPLOYMENT_TARGET_MACOSX
// call with rl and rlm locked
static CFRunLoopTimerRef __CFRunLoopModeFindTimerForMachPort(CFRunLoopModeRef rlm, __CFPort port) {
    CHECK_FOR_FORK();
    CFRunLoopTimerRef result = NULL;
    __CFRunLoopTimerPortMapLock();
    if (NULL != __CFRLTPortMap) {
        result = (CFRunLoopTimerRef)CFDictionaryGetValue(__CFRLTPortMap, (void *)(uintptr_t)port);
    }
    __CFRunLoopTimerPortMapUnlock();
    return result;
}
#endif

// Remove backreferences the mode's sources have to the rl (context);
// the primary purpose of rls->_runLoops is so that Invalidation can remove
// the source from the run loops it is in, but during deallocation of a
// run loop, we already know that the sources are going to be punted
// from it, so invalidation of sources does not need to remove from a
// deallocating run loop.
static void __CFRunLoopCleanseSources(const void *value, void *context) {
    CFRunLoopModeRef rlm = (CFRunLoopModeRef)value;
    CFRunLoopRef rl = (CFRunLoopRef)context;
    CFIndex idx, cnt;
    const void **list, *buffer[256];
    if (NULL == rlm->_sources) return;
    cnt = CFSetGetCount(rlm->_sources);
    list = (cnt <= 256) ? buffer : CFAllocatorAllocate(kCFAllocatorSystemDefault, cnt * sizeof(void *), 0);
    CFSetGetValues(rlm->_sources, list);
    for (idx = 0; idx < cnt; idx++) {
        CFRunLoopSourceRef rls = (CFRunLoopSourceRef)list[idx];
        __CFRunLoopSourceLock(rls);
        if (NULL != rls->_runLoops) {
            CFBagRemoveValue(rls->_runLoops, rl);
        }
        __CFRunLoopSourceUnlock(rls);
    }
    if (list != buffer) CFAllocatorDeallocate(kCFAllocatorSystemDefault, list);
}

static void __CFRunLoopDeallocateSources(const void *value, void *context) {
    CFRunLoopModeRef rlm = (CFRunLoopModeRef)value;
    CFRunLoopRef rl = (CFRunLoopRef)context;
    CFIndex idx, cnt;
    const void **list, *buffer[256];
    if (NULL == rlm->_sources) return;
    cnt = CFSetGetCount(rlm->_sources);
    list = (cnt <= 256) ? buffer : CFAllocatorAllocate(kCFAllocatorSystemDefault, cnt * sizeof(void *), 0);
    CFSetGetValues(rlm->_sources, list);
    for (idx = 0; idx < cnt; idx++) {
        CFRetain(list[idx]);
    }
    CFSetRemoveAllValues(rlm->_sources);
    for (idx = 0; idx < cnt; idx++) {
        __CFRunLoopSourceCancel((CFRunLoopSourceRef)list[idx], rl, rlm);
        CFRelease(list[idx]);
    }
    if (list != buffer) CFAllocatorDeallocate(kCFAllocatorSystemDefault, list);
}

static void __CFRunLoopDeallocateObservers(const void *value, void *context) {
    CFRunLoopModeRef rlm = (CFRunLoopModeRef)value;
    CFRunLoopRef rl = (CFRunLoopRef)context;
    CFIndex idx, cnt;
    const void **list, *buffer[256];
    if (NULL == rlm->_observers) return;
    cnt = CFSetGetCount(rlm->_observers);
    list = (cnt <= 256) ? buffer : CFAllocatorAllocate(kCFAllocatorSystemDefault, cnt * sizeof(void *), 0);
    CFSetGetValues(rlm->_observers, list);
    for (idx = 0; idx < cnt; idx++) {
        CFRetain(list[idx]);
    }
    CFSetRemoveAllValues(rlm->_observers);
    for (idx = 0; idx < cnt; idx++) {
        __CFRunLoopObserverCancel((CFRunLoopObserverRef)list[idx], rl, rlm);
        CFRelease(list[idx]);
    }
    if (list != buffer) CFAllocatorDeallocate(kCFAllocatorSystemDefault, list);
}

static void __CFRunLoopDeallocateTimers(const void *value, void *context) {
    CFRunLoopModeRef rlm = (CFRunLoopModeRef)value;
    CFRunLoopRef rl = (CFRunLoopRef)context;
    CFIndex idx, cnt;
    const void **list, *buffer[256];
    if (NULL == rlm->_timers) return;
    cnt = CFSetGetCount(rlm->_timers);
    list = (cnt <= 256) ? buffer : CFAllocatorAllocate(kCFAllocatorSystemDefault, cnt * sizeof(void *), 0);
    CFSetGetValues(rlm->_timers, list);
    for (idx = 0; idx < cnt; idx++) {
        CFRetain(list[idx]);
    }
    CFSetRemoveAllValues(rlm->_timers);
    for (idx = 0; idx < cnt; idx++) {
        __CFRunLoopTimerCancel((CFRunLoopTimerRef)list[idx], rl, rlm);
        CFRelease(list[idx]);
    }
    if (list != buffer) CFAllocatorDeallocate(kCFAllocatorSystemDefault, list);
}

static void __CFRunLoopDeallocate(CFTypeRef cf) {
    CFRunLoopRef rl = (CFRunLoopRef)cf;
    /* We try to keep the run loop in a valid state as long as possible,
       since sources may have non-retained references to the run loop.
       Another reason is that we don't want to lock the run loop for
       callback reasons, if we can get away without that.  We start by
       eliminating the sources, since they are the most likely to call
       back into the run loop during their "cancellation". Common mode
       items will be removed from the mode indirectly by the following
       three lines. */
    __CFRunLoopSetDeallocating(rl);
    if (NULL != rl->_modes) {
        CFSetApplyFunction(rl->_modes, (__CFRunLoopCleanseSources), rl); // remove references to rl
        CFSetApplyFunction(rl->_modes, (__CFRunLoopDeallocateSources), rl);
        CFSetApplyFunction(rl->_modes, (__CFRunLoopDeallocateObservers), rl);
        CFSetApplyFunction(rl->_modes, (__CFRunLoopDeallocateTimers), rl);
    }
    __CFRunLoopLock(rl);
    if (NULL != rl->_commonModeItems) {
        CFRelease(rl->_commonModeItems);
    }
    if (NULL != rl->_commonModes) {
        CFRelease(rl->_commonModes);
    }
    if (NULL != rl->_modes) {
        CFRelease(rl->_modes);
    }
    __CFPortFree(rl->_wakeUpPort);
    rl->_wakeUpPort = CFPORT_NULL;
    __CFRunLoopUnlock(rl);
}

static const CFRuntimeClass __CFRunLoopModeClass = {
    0,
    "CFRunLoopMode",
    NULL,      // init
    NULL,      // copy
    __CFRunLoopModeDeallocate,
    __CFRunLoopModeEqual,
    __CFRunLoopModeHash,
    NULL,      // 
    __CFRunLoopModeCopyDescription
};

static const CFRuntimeClass __CFRunLoopClass = {
    0,
    "CFRunLoop",
    NULL,      // init
    NULL,      // copy
    __CFRunLoopDeallocate,
    NULL,
    NULL,
    NULL,      // 
    __CFRunLoopCopyDescription
};

__private_extern__ void __CFRunLoopInitialize(void) {
    __kCFRunLoopTypeID = _CFRuntimeRegisterClass(&__CFRunLoopClass);
    __kCFRunLoopModeTypeID = _CFRuntimeRegisterClass(&__CFRunLoopModeClass);
}
 
CFTypeID CFRunLoopGetTypeID(void) {
    return __kCFRunLoopTypeID;
}

static CFRunLoopRef __CFRunLoopCreate(void) {
    CFRunLoopRef loop = NULL;
    CFRunLoopModeRef rlm;
    uint32_t size = sizeof(struct __CFRunLoop) - sizeof(CFRuntimeBase);
    loop = (CFRunLoopRef)_CFRuntimeCreateInstance(kCFAllocatorSystemDefault, __kCFRunLoopTypeID, size, NULL);
    if (NULL == loop) {
        return NULL;
    }
    loop->_stopped = NULL;
    CF_SPINLOCK_INIT_FOR_STRUCTS(loop->_lock);
    loop->_wakeUpPort = __CFPortAllocate();
    if (CFPORT_NULL == loop->_wakeUpPort) HALT;
    loop->_commonModes = CFSetCreateMutable(CFGetAllocator(loop), 0, &kCFTypeSetCallBacks);
    CFSetAddValue(loop->_commonModes, kCFRunLoopDefaultMode);
    loop->_commonModeItems = NULL;
    loop->_currentMode = NULL;
    loop->_modes = CFSetCreateMutable(CFGetAllocator(loop), 0, &kCFTypeSetCallBacks);
    _CFSetSetCapacity(loop->_modes, 10);
    loop->_counterpart = NULL;
    rlm = __CFRunLoopFindMode(loop, kCFRunLoopDefaultMode, true);
    if (NULL != rlm) __CFRunLoopModeUnlock(rlm);
    return loop;
}

static void __CFRunLoopRemoveAllSources(CFRunLoopRef rl, CFStringRef modeName);

static CFMutableDictionaryRef __CFRunLoops = NULL;
static char setMainLoop = 0;
static CFSpinLock_t loopsLock = CFSpinLockInit;

// If this is called on a non-main thread, and the main thread pthread_t is passed in,
// and this has not yet beed called on the main thread (since the last fork(), this will
// produce a different run loop that will probably be tossed away eventually, than the
// main thread run loop. There's nothing much we can do about that, without a call to
// fetch the main thread's pthread_t from the pthreads subsystem.

// t==0 is a synonym for "main thread" that always works
static CFRunLoopRef _CFRunLoop0(pthread_t t) {
    CFRunLoopRef loop;
    __CFSpinLock(&loopsLock);
    if (!__CFRunLoops) {
        __CFSpinUnlock(&loopsLock);
        CFMutableDictionaryRef dict = CFDictionaryCreateMutable(kCFAllocatorSystemDefault, 0, NULL, &kCFTypeDictionaryValueCallBacks);
        CFRunLoopRef mainLoop = __CFRunLoopCreate();
        CFDictionarySetValue(dict, pthreadPointer(kNilPthreadT), mainLoop);
        if (!OSAtomicCompareAndSwapPtrBarrier(NULL, dict, (void * volatile *)&__CFRunLoops)) {
            CFRelease(dict);
        }
        CFRelease(mainLoop);
        __CFSpinLock(&loopsLock);
    }
    if (pthread_main_np() && pthread_equal(t, pthread_self())) {
        t = kNilPthreadT;
    }
    loop = (CFRunLoopRef)CFDictionaryGetValue(__CFRunLoops, pthreadPointer(t));
    if (!loop) {
        __CFSpinUnlock(&loopsLock);
        CFRunLoopRef newLoop = __CFRunLoopCreate();
        __CFSpinLock(&loopsLock);
        loop = (CFRunLoopRef)CFDictionaryGetValue(__CFRunLoops, pthreadPointer(t));
        if (!loop) {
            CFDictionarySetValue(__CFRunLoops, pthreadPointer(t), newLoop);
            loop = newLoop;
        }
        CFRelease(newLoop);
    }
    if (!setMainLoop && pthread_main_np()) {
        if (pthread_equal(t, kNilPthreadT)) {
            CFDictionarySetValue(__CFRunLoops, pthreadPointer(pthread_self()), loop);
        } else {
            CFRunLoopRef mainLoop = (CFRunLoopRef)CFDictionaryGetValue(__CFRunLoops, pthreadPointer(kNilPthreadT));
            CFDictionarySetValue(__CFRunLoops, pthreadPointer(pthread_self()), mainLoop);
        }
        setMainLoop = 1;
    }
    __CFSpinUnlock(&loopsLock);
    return loop;
}

// Called for each thread as it exits
static void __CFFinalizeRunLoop(void *arg) {
    CFRunLoopRef rl = NULL;
    __CFSpinLock(&loopsLock);
    if (__CFRunLoops) {
        rl = (CFRunLoopRef)CFDictionaryGetValue(__CFRunLoops, pthreadPointer(pthread_self()));
        if (rl) CFRetain(rl);
        CFDictionaryRemoveValue(__CFRunLoops, pthreadPointer(pthread_self()));
        }
    __CFSpinUnlock(&loopsLock);
    if (rl && CFRunLoopGetMain() != rl) {
        // purge all sources before deallocation
        CFArrayRef array = CFRunLoopCopyAllModes(rl);
        for (CFIndex idx = CFArrayGetCount(array); idx--;) {
            CFStringRef modeName = CFArrayGetValueAtIndex(array, idx);
            __CFRunLoopRemoveAllSources(rl, modeName);
        }
        __CFRunLoopRemoveAllSources(rl, kCFRunLoopCommonModes);
        CFRelease(array);
    }
    if (rl) {
        CFRelease(rl);
    }
}

__private_extern__ void _CFRunLoop1(void) { __CFFinalizeRunLoop(0); }

void _CFRunLoopSetCurrent(CFRunLoopRef rl) {
    CFRunLoopRef currentLoop = CFRunLoopGetCurrent();
    if (rl != currentLoop) {
        __CFSpinLock(&loopsLock);
        if (rl) {
            CFDictionarySetValue(__CFRunLoops, pthreadPointer(pthread_self()), rl);
        } else {
            CFDictionaryRemoveValue(__CFRunLoops, pthreadPointer(pthread_self()));
    }
    __CFSpinUnlock(&loopsLock);
    }
}

CFRunLoopRef CFRunLoopGetMain(void) {
    CHECK_FOR_FORK();
    return _CFRunLoop0(kNilPthreadT);
}

CFRunLoopRef CFRunLoopGetCurrent(void) {
    CHECK_FOR_FORK();
    return _CFRunLoop0(pthread_self());
}

CFStringRef CFRunLoopCopyCurrentMode(CFRunLoopRef rl) {
    CHECK_FOR_FORK();
    CFStringRef result = NULL;
    __CFRunLoopLock(rl);
    if (NULL != rl->_currentMode) {
        result = CFRetain(rl->_currentMode->_name);
    }
    __CFRunLoopUnlock(rl);
    return result;
}

static void __CFRunLoopGetModeName(const void *value, void *context) {
    CFRunLoopModeRef rlm = (CFRunLoopModeRef)value;
    CFMutableArrayRef array = (CFMutableArrayRef)context;
    CFArrayAppendValue(array, rlm->_name);
}

CFArrayRef CFRunLoopCopyAllModes(CFRunLoopRef rl) {
    CHECK_FOR_FORK();
    CFMutableArrayRef array;
    __CFRunLoopLock(rl);
    array = CFArrayCreateMutable(kCFAllocatorSystemDefault, CFSetGetCount(rl->_modes), &kCFTypeArrayCallBacks);
    CFSetApplyFunction(rl->_modes, (__CFRunLoopGetModeName), array);
    __CFRunLoopUnlock(rl);
    return array;
}

static void __CFRunLoopAddItemsToCommonMode(const void *value, void *ctx) {
    CFTypeRef item = (CFTypeRef)value;
    CFRunLoopRef rl = (CFRunLoopRef)(((CFTypeRef *)ctx)[0]);
    CFStringRef modeName = (CFStringRef)(((CFTypeRef *)ctx)[1]);
    if (CFGetTypeID(item) == __kCFRunLoopSourceTypeID) {
        CFRunLoopAddSource(rl, (CFRunLoopSourceRef)item, modeName);
    } else if (CFGetTypeID(item) == __kCFRunLoopObserverTypeID) {
        CFRunLoopAddObserver(rl, (CFRunLoopObserverRef)item, modeName);
    } else if (CFGetTypeID(item) == __kCFRunLoopTimerTypeID) {
        CFRunLoopAddTimer(rl, (CFRunLoopTimerRef)item, modeName);
    }
}

static void __CFRunLoopAddItemToCommonModes(const void *value, void *ctx) {
    CFStringRef modeName = (CFStringRef)value;
    CFRunLoopRef rl = (CFRunLoopRef)(((CFTypeRef *)ctx)[0]);
    CFTypeRef item = (CFTypeRef)(((CFTypeRef *)ctx)[1]);
    if (CFGetTypeID(item) == __kCFRunLoopSourceTypeID) {
        CFRunLoopAddSource(rl, (CFRunLoopSourceRef)item, modeName);
    } else if (CFGetTypeID(item) == __kCFRunLoopObserverTypeID) {
        CFRunLoopAddObserver(rl, (CFRunLoopObserverRef)item, modeName);
    } else if (CFGetTypeID(item) == __kCFRunLoopTimerTypeID) {
        CFRunLoopAddTimer(rl, (CFRunLoopTimerRef)item, modeName);
    }
}

static void __CFRunLoopRemoveItemFromCommonModes(const void *value, void *ctx) {
    CFStringRef modeName = (CFStringRef)value;
    CFRunLoopRef rl = (CFRunLoopRef)(((CFTypeRef *)ctx)[0]);
    CFTypeRef item = (CFTypeRef)(((CFTypeRef *)ctx)[1]);
    if (CFGetTypeID(item) == __kCFRunLoopSourceTypeID) {
        CFRunLoopRemoveSource(rl, (CFRunLoopSourceRef)item, modeName);
    } else if (CFGetTypeID(item) == __kCFRunLoopObserverTypeID) {
        CFRunLoopRemoveObserver(rl, (CFRunLoopObserverRef)item, modeName);
    } else if (CFGetTypeID(item) == __kCFRunLoopTimerTypeID) {
        CFRunLoopRemoveTimer(rl, (CFRunLoopTimerRef)item, modeName);
    }
}

Boolean _CFRunLoop01(CFRunLoopRef rl, CFStringRef modeName) {
    __CFRunLoopLock(rl);
    Boolean present = CFSetContainsValue(rl->_commonModes, modeName);
    __CFRunLoopUnlock(rl);
    return present; 
}

void *_CFRunLoop02(CFRunLoopRef rl) {
    return rl->_counterpart;
}

void _CFRunLoop03(CFRunLoopRef rl, void *ns) {
    rl->_counterpart = ns;
}

void CFRunLoopAddCommonMode(CFRunLoopRef rl, CFStringRef modeName) {
    CHECK_FOR_FORK();
    if (__CFRunLoopIsDeallocating(rl)) return;
    __CFRunLoopLock(rl);
    if (!CFSetContainsValue(rl->_commonModes, modeName)) {
        CFSetRef set = rl->_commonModeItems ? CFSetCreateCopy(kCFAllocatorSystemDefault, rl->_commonModeItems) : NULL;
        CFSetAddValue(rl->_commonModes, modeName);
        __CFRunLoopUnlock(rl);
        if (NULL != set) {
            CFTypeRef context[2] = {rl, modeName};
            /* add all common-modes items to new mode */
            CFSetApplyFunction(set, (__CFRunLoopAddItemsToCommonMode), (void *)context);
            CFRelease(set);
        }
    } else {
        __CFRunLoopUnlock(rl);
    }
}

static CFComparisonResult __CFRunLoopObserverQSortComparator(const void *val1, const void *val2, void *context) {
    CFRunLoopObserverRef o1 = *((CFRunLoopObserverRef *)val1);
    CFRunLoopObserverRef o2 = *((CFRunLoopObserverRef *)val2);
    if (!o1) {
        return (!o2) ? kCFCompareEqualTo : kCFCompareLessThan;
    }
    if (!o2) {
        return kCFCompareGreaterThan;
    }
    if (o1->_order < o2->_order) return kCFCompareLessThan;
    if (o2->_order < o1->_order) return kCFCompareGreaterThan;
    return kCFCompareEqualTo;
}


/* rl is unlocked, rlm is locked on entrance and exit */
/* ALERT: this should collect all the candidate observers from the top level
 * and all submodes, recursively, THEN start calling them, in order to obey
 * the ordering parameter. */
static void __CFRunLoopDoObservers(CFRunLoopRef rl, CFRunLoopModeRef rlm, CFRunLoopActivity activity) { /* DOES CALLOUT */
    CHECK_FOR_FORK();
    CFIndex idx, cnt;
    CFArrayRef submodes;

    /* Fire the observers */
    submodes = (NULL != rlm->_submodes && 0 < CFArrayGetCount(rlm->_submodes)) ? CFArrayCreateCopy(kCFAllocatorSystemDefault, rlm->_submodes) : NULL;
    if (NULL != rlm->_observers) {
        cnt = CFSetGetCount(rlm->_observers);
        if (0 < cnt) {
            CFRunLoopObserverRef buffer[(cnt <= 1024) ? cnt : 1];
            CFRunLoopObserverRef *collectedObservers = (cnt <= 1024) ? buffer : CFAllocatorAllocate(kCFAllocatorSystemDefault, cnt * sizeof(CFRunLoopObserverRef), 0);
            CFSetGetValues(rlm->_observers, (const void **)collectedObservers);
            for (idx = 0; idx < cnt; idx++) {
                CFRunLoopObserverRef rlo = collectedObservers[idx];
                if (0 != (rlo->_activities & activity) && __CFIsValid(rlo) && !__CFRunLoopObserverIsFiring(rlo)) {
                    CFRetain(rlo);
                } else {
                    /* We're not interested in this one - set it to NULL so we don't process it later */
                    collectedObservers[idx] = NULL;
                }
            }
            __CFRunLoopModeUnlock(rlm);
            CFQSortArray(collectedObservers, cnt, sizeof(CFRunLoopObserverRef), __CFRunLoopObserverQSortComparator, NULL);
            for (idx = 0; idx < cnt; idx++) {
                CFRunLoopObserverRef rlo = collectedObservers[idx];
                if (rlo) {
                    __CFRunLoopObserverLock(rlo);
                    if (__CFIsValid(rlo)) {
                        __CFRunLoopObserverUnlock(rlo);
                        __CFRunLoopObserverSetFiring(rlo);
                        rlo->_callout(rlo, activity, rlo->_context.info);       /* CALLOUT */
                        __CFRunLoopObserverUnsetFiring(rlo);
                        if (!__CFRunLoopObserverRepeats(rlo)) {
                            CFRunLoopObserverInvalidate(rlo);
                        }
                    } else {
                        __CFRunLoopObserverUnlock(rlo);
                    }
                    CFRelease(rlo);
                }
            }
            __CFRunLoopModeLock(rlm);
            if (collectedObservers != buffer) CFAllocatorDeallocate(kCFAllocatorSystemDefault, collectedObservers);
        }
    }
    if (NULL != submodes) {
        __CFRunLoopModeUnlock(rlm);
        for (idx = 0, cnt = CFArrayGetCount(submodes); idx < cnt; idx++) {
            CFStringRef modeName = (CFStringRef)CFArrayGetValueAtIndex(submodes, idx);
            CFRunLoopModeRef subrlm;
            __CFRunLoopLock(rl);
            subrlm = __CFRunLoopFindMode(rl, modeName, false);
            __CFRunLoopUnlock(rl);
            if (NULL != subrlm) {
                __CFRunLoopDoObservers(rl, subrlm, activity);
                __CFRunLoopModeUnlock(subrlm);
            }
        }
        CFRelease(submodes);
        __CFRunLoopModeLock(rlm);
    }
}

static CFComparisonResult __CFRunLoopSourceComparator(const void *val1, const void *val2, void *context) {
    CFRunLoopSourceRef o1 = (CFRunLoopSourceRef)val1;
    CFRunLoopSourceRef o2 = (CFRunLoopSourceRef)val2;
    if (o1->_order < o2->_order) return kCFCompareLessThan;
    if (o2->_order < o1->_order) return kCFCompareGreaterThan;
    return kCFCompareEqualTo;
}

static void __CFRunLoopCollectSources0(const void *value, void *context) {
    CFRunLoopSourceRef rls = (CFRunLoopSourceRef)value;
    CFTypeRef *sources = (CFTypeRef *)context;
    if (0 == rls->_context.version0.version && __CFIsValid(rls) && __CFRunLoopSourceIsSignaled(rls)) {
        if (NULL == *sources) {
            *sources = CFRetain(rls);
        } else if (CFGetTypeID(*sources) == __kCFRunLoopSourceTypeID) {
            CFTypeRef oldrls = *sources;
            *sources = CFArrayCreateMutable(kCFAllocatorSystemDefault, 0, &kCFTypeArrayCallBacks);
            CFArrayAppendValue((CFMutableArrayRef)*sources, oldrls);
            CFArrayAppendValue((CFMutableArrayRef)*sources, rls);
            CFRelease(oldrls);
        } else {
            CFArrayAppendValue((CFMutableArrayRef)*sources, rls);
        }
    }
}

/* rl is unlocked, rlm is locked on entrance and exit */
static Boolean __CFRunLoopDoSources0(CFRunLoopRef rl, CFRunLoopModeRef rlm, Boolean stopAfterHandle) {  /* DOES CALLOUT */
    CHECK_FOR_FORK();
    CFTypeRef sources = NULL;
    Boolean sourceHandled = false;
    CFIndex idx, cnt;

    __CFRunLoopModeUnlock(rlm); // locks have to be taken in order
    __CFRunLoopLock(rl);
    __CFRunLoopModeLock(rlm);
    /* Fire the version 0 sources */
    if (NULL != rlm->_sources && 0 < CFSetGetCount(rlm->_sources)) {
        CFSetApplyFunction(rlm->_sources, (__CFRunLoopCollectSources0), &sources);
    }
    for (idx = 0, cnt = (NULL != rlm->_submodes) ? CFArrayGetCount(rlm->_submodes) : 0; idx < cnt; idx++) {
        CFStringRef modeName = (CFStringRef)CFArrayGetValueAtIndex(rlm->_submodes, idx);
        CFRunLoopModeRef subrlm;
        subrlm = __CFRunLoopFindMode(rl, modeName, false);
        if (NULL != subrlm) {
            if (NULL != subrlm->_sources && 0 < CFSetGetCount(subrlm->_sources)) {
                CFSetApplyFunction(subrlm->_sources, (__CFRunLoopCollectSources0), &sources);
            }
            __CFRunLoopModeUnlock(subrlm);
        }
    }
    __CFRunLoopUnlock(rl);
    if (NULL != sources) {
        // sources is either a single (retained) CFRunLoopSourceRef or an array of (retained) CFRunLoopSourceRef
        __CFRunLoopModeUnlock(rlm);
        if (CFGetTypeID(sources) == __kCFRunLoopSourceTypeID) {
            CFRunLoopSourceRef rls = (CFRunLoopSourceRef)sources;
            __CFRunLoopSourceLock(rls);
            __CFRunLoopSourceUnsetSignaled(rls);
            if (__CFIsValid(rls)) {
                __CFRunLoopSourceUnlock(rls);
                if (NULL != rls->_context.version0.perform) {
                    rls->_context.version0.perform(rls->_context.version0.info); /* CALLOUT */
                    CHECK_FOR_FORK();
                }
                sourceHandled = true;
            } else {
                __CFRunLoopSourceUnlock(rls);
            }
        } else {
            cnt = CFArrayGetCount(sources);
            CFArraySortValues((CFMutableArrayRef)sources, CFRangeMake(0, cnt), (__CFRunLoopSourceComparator), NULL);
            for (idx = 0; idx < cnt; idx++) {
                CFRunLoopSourceRef rls = (CFRunLoopSourceRef)CFArrayGetValueAtIndex(sources, idx);
                __CFRunLoopSourceLock(rls);
                __CFRunLoopSourceUnsetSignaled(rls);
                if (__CFIsValid(rls)) {
                    __CFRunLoopSourceUnlock(rls);
                    if (NULL != rls->_context.version0.perform) {
                        rls->_context.version0.perform(rls->_context.version0.info); /* CALLOUT */
                        CHECK_FOR_FORK();
                    }
                    sourceHandled = true;
                } else {
                    __CFRunLoopSourceUnlock(rls);
                }
                if (stopAfterHandle && sourceHandled) {
                    break;
                }
            }
        }
        CFRelease(sources);
        __CFRunLoopModeLock(rlm);
    }
    return sourceHandled;
}

// msg, size and reply are unused on Windows
static Boolean __CFRunLoopDoSource1(CFRunLoopRef rl, CFRunLoopModeRef rlm, CFRunLoopSourceRef rls
#if DEPLOYMENT_TARGET_MACOSX
                                    , mach_msg_header_t *msg, CFIndex size, mach_msg_header_t **reply
#endif
                                    ) { /* DOES CALLOUT */
    CHECK_FOR_FORK();
    Boolean sourceHandled = false;

    /* Fire a version 1 source */
    CFRetain(rls);
    __CFRunLoopModeUnlock(rlm);
    __CFRunLoopSourceLock(rls);
    if (__CFIsValid(rls)) {
        __CFRunLoopSourceUnsetSignaled(rls);
        __CFRunLoopSourceUnlock(rls);
        if (NULL != rls->_context.version1.perform) {
#if DEPLOYMENT_TARGET_MACOSX
            *reply = rls->_context.version1.perform(msg, size, kCFAllocatorSystemDefault, rls->_context.version1.info); /* CALLOUT */
            CHECK_FOR_FORK();
#else
            if (_LogCFRunLoop) { CFLog(kCFLogLevelDebug, CFSTR("%p (%s) __CFRunLoopDoSource1 performing rls %p"), CFRunLoopGetCurrent(), *_CFGetProgname(), rls); }
            rls->_context.version1.perform(rls->_context.version1.info); /* CALLOUT */
            CHECK_FOR_FORK();
#endif
        } else {
        if (_LogCFRunLoop) { CFLog(kCFLogLevelDebug, CFSTR("%p (%s) __CFRunLoopDoSource1 perform is NULL"), CFRunLoopGetCurrent(), *_CFGetProgname()); }
    }
        sourceHandled = true;
    } else {
        if (_LogCFRunLoop) { CFLog(kCFLogLevelDebug, CFSTR("%p (%s) __CFRunLoopDoSource1 rls %p is invalid"), CFRunLoopGetCurrent(), *_CFGetProgname(), rls); }
        __CFRunLoopSourceUnlock(rls);
    }
    CFRelease(rls);
    __CFRunLoopModeLock(rlm);
    return sourceHandled;
}

static Boolean __CFRunLoopDoTimer(CFRunLoopRef rl, CFRunLoopModeRef rlm, CFRunLoopTimerRef rlt) {       /* DOES CALLOUT */
    Boolean timerHandled = false;
    int64_t oldFireTSR = 0;

    /* Fire a timer */
    CFRetain(rlt);
    __CFRunLoopModeUnlock(rlm);
    __CFRunLoopTimerLock(rlt);
    if (__CFIsValid(rlt) && !__CFRunLoopTimerIsFiring(rlt)) {
        __CFRunLoopTimerUnsetDidFire(rlt);
        __CFRunLoopTimerSetFiring(rlt);
        __CFRunLoopTimerUnlock(rlt);
        __CFRunLoopTimerFireTSRLock();
        oldFireTSR = rlt->_fireTSR;
        __CFRunLoopTimerFireTSRUnlock();
        rlt->_callout(rlt, rlt->_context.info); /* CALLOUT */
        CHECK_FOR_FORK();
        __CFRunLoopTimerUnsetFiring(rlt);
        timerHandled = true;
    } else {
        // If the timer fires while it is firing in a higher activiation,
        // it is not allowed to fire, but we have to remember that fact.
        // Later, if the timer's fire date is being handled manually, we
        // need to re-arm the kernel timer, since it has possibly already
        // fired (this firing which is being skipped, say) and the timer
        // will permanently stop if we completely drop this firing.
        if (__CFRunLoopTimerIsFiring(rlt)) __CFRunLoopTimerSetDidFire(rlt);
        __CFRunLoopTimerUnlock(rlt);
    }
    if (__CFIsValid(rlt) && timerHandled) {
        if (0 == rlt->_intervalTSR) {
            CFRunLoopTimerInvalidate(rlt);      /* DOES CALLOUT */
        } else {
            /* This is just a little bit tricky: we want to support calling
             * CFRunLoopTimerSetNextFireDate() from within the callout and
             * honor that new time here if it is a later date, otherwise
             * it is completely ignored. */
            int64_t currentFireTSR;
            __CFRunLoopTimerFireTSRLock();
            currentFireTSR = rlt->_fireTSR;
            if (oldFireTSR < currentFireTSR) {
                /* Next fire TSR was set, and set to a date after the previous
                 * fire date, so we honor it. */
                if (__CFRunLoopTimerDidFire(rlt)) {
                    __CFRunLoopTimerRescheduleWithAllModes(rlt, rl);
                    __CFRunLoopTimerUnsetDidFire(rlt);
                }
            } else {
                if ((uint64_t)LLONG_MAX <= (uint64_t)oldFireTSR + (uint64_t)rlt->_intervalTSR) {
                    currentFireTSR = LLONG_MAX;
                } else {
                    int64_t currentTSR = (int64_t)__CFReadTSR();
                    currentFireTSR = oldFireTSR;
                    while (currentFireTSR <= currentTSR) {
                        currentFireTSR += rlt->_intervalTSR;
                    }
                }
                rlt->_fireTSR = currentFireTSR;
                __CFRunLoopTimerRescheduleWithAllModes(rlt, rl);
            }
            __CFRunLoopTimerFireTSRUnlock();
        }
    }
    CFRelease(rlt);
    __CFRunLoopModeLock(rlm);
    return timerHandled;
}

CF_EXPORT Boolean _CFRunLoopFinished(CFRunLoopRef rl, CFStringRef modeName) {
    CHECK_FOR_FORK();
    CFRunLoopModeRef rlm;
    Boolean result = false;
    __CFRunLoopLock(rl);
    rlm = __CFRunLoopFindMode(rl, modeName, false);
    if (NULL == rlm || __CFRunLoopModeIsEmpty(rl, rlm)) {
        result = true;
    }
    __CFRunLoopUnlock(rl);
    if (rlm) __CFRunLoopModeUnlock(rlm);
    return result;
}

// rl is locked, rlm is locked on entry and exit
static void __CFRunLoopModeAddPortsToPortSet(CFRunLoopRef rl, CFRunLoopModeRef rlm, __CFPortSet portSet) {
    CFIndex idx, cnt;
    const void **list, *buffer[256];

    // Timers and version 1 sources go into the portSet currently
    if (NULL != rlm->_sources) {
        cnt = CFSetGetCount(rlm->_sources);
        list = (cnt <= 256) ? buffer : CFAllocatorAllocate(kCFAllocatorSystemDefault, cnt * sizeof(void *), 0);
        CFSetGetValues(rlm->_sources, list);
        for (idx = 0; idx < cnt; idx++) {
            CFRunLoopSourceRef rls = (CFRunLoopSourceRef)list[idx];
            if (1 == rls->_context.version0.version) {
                __CFPort port = rls->_context.version1.getPort(rls->_context.version1.info);    /* CALLOUT */
                if (CFPORT_NULL != port) {
                    __CFPortSetInsert(port, portSet);
                }
            }
        }
        if (list != buffer) CFAllocatorDeallocate(kCFAllocatorSystemDefault, list);
    }
#if DEPLOYMENT_TARGET_MACOSX
    if (NULL != rlm->_timers) {
        cnt = CFSetGetCount(rlm->_timers);
        list = (cnt <= 256) ? buffer : CFAllocatorAllocate(kCFAllocatorSystemDefault, cnt * sizeof(void *), 0);
        CFSetGetValues(rlm->_timers, list);
        for (idx = 0; idx < cnt; idx++) {
            CFRunLoopTimerRef rlt = (CFRunLoopTimerRef)list[idx];
            if (MACH_PORT_NULL != rlt->_port) {
                mach_port_insert_member(mach_task_self(), rlt->_port, portSet);
            }
        }
        if (list != buffer) CFAllocatorDeallocate(kCFAllocatorSystemDefault, list);
    }
#endif
    // iterate over submodes
    for (idx = 0, cnt = NULL != rlm->_submodes ? CFArrayGetCount(rlm->_submodes) : 0; idx < cnt; idx++) {
        CFStringRef modeName = (CFStringRef)CFArrayGetValueAtIndex(rlm->_submodes, idx);
        CFRunLoopModeRef subrlm;
        subrlm = __CFRunLoopFindMode(rl, modeName, false);
        if (NULL != subrlm) {
            __CFRunLoopModeAddPortsToPortSet(rl, subrlm, portSet);
            __CFRunLoopModeUnlock(subrlm);
        }
    }
}

static __CFPortSet _LastMainWaitSet = 0;

// return NO if we're the main runloop and there are no messages waiting on the port set
int _CFRunLoopInputsReady(void) {
    CHECK_FOR_FORK();
    // XXX_PCB:  the following 2 lines aren't safe to call during GC, because another
    // thread may have entered CFRunLoopGetMain(), which grabs a spink lock, and then
    // is suspended by the GC. We can check for the main thread more directly
    // by calling pthread_main_np().
    // CFRunLoopRef current = CFRunLoopGetMain()
    // if (current != CFRunLoopGetMain()) return true;
#if DEPLOYMENT_TARGET_MACOSX
    if (!pthread_main_np()) return true;

    // XXX_PCB:  can't be any messages waiting if the wait set is NULL.
    if (_LastMainWaitSet == MACH_PORT_NULL) return false;
 
    // prepare a message header with no space for any data, nor a trailer
    mach_msg_header_t msg;
    msg.msgh_size = sizeof(msg);    // just the header, ma'am
    // need the waitset, actually XXX
    msg.msgh_local_port = _LastMainWaitSet;
    msg.msgh_remote_port = MACH_PORT_NULL;
    msg.msgh_id = 0;
    
    kern_return_t ret = mach_msg(&msg, MACH_RCV_MSG | MACH_RCV_TIMEOUT | MACH_RCV_LARGE, 0, msg.msgh_size, _LastMainWaitSet, 0, MACH_PORT_NULL);
    
    return (MACH_RCV_TOO_LARGE == ret);
#endif
    return true;
}

#if 0
static void print_msg_scan_header(void) {
    printf("======== ======== ======== ========\n");
    printf("description\tport\tport type\t\treferences\n");
}

static void print_one_port_info(const char *desc, mach_port_t port, mach_msg_type_name_t type) {
    mach_port_urefs_t refs;
    kern_return_t ret = mach_port_get_refs(mach_task_self(), port, MACH_PORT_RIGHT_SEND, &refs);
    if (ret != KERN_SUCCESS) refs = 0;
    const char *type_name = "???";
    switch (type) {
    case MACH_MSG_TYPE_MOVE_SEND: type_name = "MACH_MSG_TYPE_MOVE_SEND"; break;
    case MACH_MSG_TYPE_MOVE_SEND_ONCE: type_name = "MACH_MSG_TYPE_MOVE_SEND_ONCE"; break;
    case MACH_MSG_TYPE_MOVE_RECEIVE: type_name = "MACH_MSG_TYPE_MOVE_RECEIVE"; break;
    case MACH_MSG_TYPE_MAKE_SEND: type_name = "MACH_MSG_TYPE_MAKE_SEND"; break;
    case MACH_MSG_TYPE_MAKE_SEND_ONCE: type_name = "MACH_MSG_TYPE_MAKE_SEND_ONCE"; break;
    }
    printf("%s\t%p\t%-20s\t%u\n", desc, port, type_name, refs);
}

static void mach_msg_scan(mach_msg_header_t *msg, int clean) {
    Boolean printed_header = false;
    /*
     *  The msgh_local_port field doesn't hold a port right.
     *  The receive operation consumes the destination port right.
     */
    if (MACH_PORT_NULL != msg->msgh_remote_port) {
        if (! printed_header) print_msg_scan_header();
        printed_header = true;
        print_one_port_info("msg->msgh_remote_port", msg->msgh_remote_port, MACH_MSGH_BITS_REMOTE(msg->msgh_bits));
    }
    if (msg->msgh_bits & MACH_MSGH_BITS_COMPLEX) {
        mach_msg_body_t *body = (mach_msg_body_t *) (msg + 1);
        mach_msg_descriptor_t *saddr = (mach_msg_descriptor_t *) ((mach_msg_base_t *) msg + 1);
        mach_msg_descriptor_t *eaddr =  saddr + body->msgh_descriptor_count;
        for  ( ; saddr < eaddr; saddr++) {
            switch (saddr->type.type) {
            case MACH_MSG_PORT_DESCRIPTOR:;
                mach_msg_port_descriptor_t *dsc = &saddr->port;
                if (! printed_header) print_msg_scan_header();
                printed_header = true;
                print_one_port_info("port in body", dsc->name, dsc->disposition);
//              if (clean) mach_port_deallocate(mach_task_self(), dsc->name);
                break;
            case MACH_MSG_OOL_PORTS_DESCRIPTOR:;
                    mach_msg_ool_ports_descriptor_t *dsc2 = &saddr->ool_ports;
                    mach_port_t *ports = (mach_port_t *) dsc2->address;
                    for (mach_msg_type_number_t j = 0; j < dsc2->count; j++, ports++)  {
                        if (! printed_header) print_msg_scan_header();
                        printed_header = true;
                        print_one_port_info("port in OOL ports", *ports, dsc2->disposition);
                    }
                    break;
            }
        }
    }
}
#endif

/* rl is unlocked, rlm locked on entrance and exit */
static int32_t __CFRunLoopRun(CFRunLoopRef rl, CFRunLoopModeRef rlm, CFTimeInterval seconds, Boolean stopAfterHandle, Boolean waitIfEmpty) {  /* DOES CALLOUT */
    int64_t termTSR;
#if DEPLOYMENT_TARGET_MACOSX
    mach_port_name_t timeoutPort = MACH_PORT_NULL;
    Boolean timeoutPortAdded = false;
#endif
    Boolean poll = false;
    Boolean firstPass = true;

    if (__CFRunLoopIsStopped(rl)) {
        return kCFRunLoopRunStopped;
    } else if (rlm->_stopped) {
        rlm->_stopped = false;
        return kCFRunLoopRunStopped;
    }
    if (seconds <= 0.0) {
        termTSR = 0;
    } else if (3.1556952e+9 < seconds) {
        termTSR = LLONG_MAX;
    } else {
        termTSR = (int64_t)__CFReadTSR() + __CFTimeIntervalToTSR(seconds);
#if DEPLOYMENT_TARGET_MACOSX
        timeoutPort = mk_timer_create();
        mk_timer_arm(timeoutPort, __CFUInt64ToAbsoluteTime(termTSR));
#endif
    }
    if (seconds <= 0.0) {
        poll = true;
    }
    if (rl == CFRunLoopGetMain()) _LastMainWaitSet = CFPORT_NULL;
    for (;;) {
        __CFPortSet waitSet = CFPORT_NULL;
        waitSet = CFPORT_NULL;
        Boolean destroyWaitSet = false;
        CFRunLoopSourceRef rls;
#if DEPLOYMENT_TARGET_MACOSX
        mach_msg_header_t *msg;
        kern_return_t ret;
        uint8_t buffer[1024 + 80] = {0};        // large enough for 1k of inline payload; must be zeroed for GC
#else
        CFArrayRef timersToCall = NULL;
#endif
        int32_t returnValue = 0;
        Boolean sourceHandledThisLoop = false;

        __CFRunLoopDoObservers(rl, rlm, kCFRunLoopBeforeTimers);
        __CFRunLoopDoObservers(rl, rlm, kCFRunLoopBeforeSources);

        sourceHandledThisLoop = __CFRunLoopDoSources0(rl, rlm, stopAfterHandle);

        if (sourceHandledThisLoop) {
            poll = true;
        }

        if (!poll) {
            __CFRunLoopDoObservers(rl, rlm, kCFRunLoopBeforeWaiting);
            __CFRunLoopSetSleeping(rl);
        }
        if (NULL != rlm->_submodes) {
            // !!! what do we do if this doesn't succeed?
            waitSet = __CFPortSetAllocate();
            if (CFPORT_NULL == waitSet) HALT;
            __CFRunLoopModeUnlock(rlm);
            __CFRunLoopLock(rl);
            __CFRunLoopModeLock(rlm);
            __CFRunLoopModeAddPortsToPortSet(rl, rlm, waitSet);
            __CFRunLoopUnlock(rl);
#if DEPLOYMENT_TARGET_MACOSX
            if (CFPORT_NULL != timeoutPort) {
                __CFPortSetInsert(timeoutPort, waitSet);
            }
#endif
            destroyWaitSet = true;
        } else {
            waitSet = rlm->_portSet;
#if DEPLOYMENT_TARGET_MACOSX
            if (!timeoutPortAdded && CFPORT_NULL != timeoutPort) {
                __CFPortSetInsert(timeoutPort, waitSet);
                timeoutPortAdded = true;
            }
#endif
        }
        if (rl == CFRunLoopGetMain()) _LastMainWaitSet = waitSet;
        __CFRunLoopModeUnlock(rlm);

#if DEPLOYMENT_TARGET_MACOSX
        msg = (mach_msg_header_t *)buffer;
        msg->msgh_size = sizeof(buffer);

        /* In that sleep of death what nightmares may come ... */
        try_receive:
        msg->msgh_bits = 0;
        msg->msgh_local_port = waitSet;
        msg->msgh_remote_port = MACH_PORT_NULL;
        msg->msgh_id = 0;
        ret = mach_msg(msg, MACH_RCV_MSG|MACH_RCV_LARGE|(poll ? MACH_RCV_TIMEOUT : 0)|MACH_RCV_TRAILER_TYPE(MACH_MSG_TRAILER_FORMAT_0)|MACH_RCV_TRAILER_ELEMENTS(MACH_RCV_TRAILER_AUDIT), 0, msg->msgh_size, waitSet, 0, MACH_PORT_NULL);
        if (MACH_RCV_TOO_LARGE == ret) {
            uint32_t newSize = round_msg(msg->msgh_size) + sizeof(mach_msg_audit_trailer_t);
            if (msg == (mach_msg_header_t *)buffer) msg = NULL;
            msg = CFAllocatorReallocate(kCFAllocatorSystemDefault, msg, newSize, 0);
            msg->msgh_size = newSize;
            goto try_receive;
        } else if (MACH_RCV_TIMED_OUT == ret) {
            // timeout, for poll
            if (msg != (mach_msg_header_t *)buffer) CFAllocatorDeallocate(kCFAllocatorSystemDefault, msg);
            msg = NULL;
        } else if (MACH_MSG_SUCCESS != ret) {
            HALT;
        }
#elif defined(__WIN32__)
        DWORD waitResult = WAIT_TIMEOUT;
        HANDLE handleBuf[MAXIMUM_WAIT_OBJECTS];
        HANDLE *handles;
        uint32_t handleCount;
        Boolean freeHandles;
        if (destroyWaitSet) {
            // wait set is a local, no one else could modify it, no need to copy handles
            handles = waitSet->handles;
            handleCount = waitSet->used;
            freeHandles = FALSE;
        } else {
            // copy out the handles to be safe from other threads at work
            handles = __CFPortSetGetPorts(waitSet, handleBuf, MAXIMUM_WAIT_OBJECTS, &handleCount);
            freeHandles = (handles != handleBuf);
        }
        // should msgQMask be an OR'ing of this and all submodes' masks?
        if (0 == GetQueueStatus(rlm->_msgQMask)) {
            DWORD timeout;
            if (poll)
                timeout = 0;
            else {
                __CFRunLoopModeLock(rlm);
                int64_t nextStop = __CFRunLoopGetNextTimerFireTSR(rl, rlm);
                if (nextStop <= 0)
                    nextStop = termTSR;
                else if (nextStop > termTSR)
                    nextStop = termTSR;
                // else the next stop is dictated by the next timer
                int64_t timeoutTSR = nextStop - __CFReadTSR();
                if (timeoutTSR < 0)
                    timeout = 0;
                else {
                    CFTimeInterval timeoutCF = __CFTSRToTimeInterval(timeoutTSR) * 1000;
                    if (timeoutCF > MAXDWORD)
                        timeout = INFINITE;
                    else
                        timeout = timeoutCF;
                }
            }
        if (_LogCFRunLoop) { CFLog(kCFLogLevelDebug, CFSTR("%p (%s)- about to wait for %d objects, wakeupport is %p"), CFRunLoopGetCurrent(), *_CFGetProgname(), handleCount, rl->_wakeUpPort); }
        if (_LogCFRunLoop) { CFLog(kCFLogLevelDebug, CFSTR("All RLM sources = %@"), rlm->_sources); }
        waitResult = MsgWaitForMultipleObjects(__CFMin(handleCount, MAXIMUM_WAIT_OBJECTS), handles, false, timeout, rlm->_msgQMask);
        if (_LogCFRunLoop) { CFLog(kCFLogLevelDebug, CFSTR("%p (%s)- waitResult was %d"), CFRunLoopGetCurrent(), *_CFGetProgname(), waitResult); }
        }
        ResetEvent(rl->_wakeUpPort);
#endif
        if (destroyWaitSet) {
            __CFPortSetFree(waitSet);
            if (rl == CFRunLoopGetMain()) _LastMainWaitSet = 0;
        }
        __CFRunLoopLock(rl);
        __CFRunLoopModeLock(rlm);
        __CFRunLoopUnlock(rl);
        if (!poll) {
            __CFRunLoopUnsetSleeping(rl);
            __CFRunLoopDoObservers(rl, rlm, kCFRunLoopAfterWaiting);
        }
        poll = false;
        __CFRunLoopModeUnlock(rlm);
        __CFRunLoopLock(rl);
        __CFRunLoopModeLock(rlm);

        __CFPort livePort = CFPORT_NULL;
#if DEPLOYMENT_TARGET_MACOSX
        if (NULL != msg) {
            livePort = msg->msgh_local_port;
        }
#elif defined(__WIN32__)
        CFAssert2(waitResult != WAIT_FAILED, __kCFLogAssertion, "%s(): error %d from MsgWaitForMultipleObjects", __PRETTY_FUNCTION__, GetLastError());
        if (waitResult == WAIT_TIMEOUT) {
            // do nothing, just return to caller
        } else if (waitResult >= WAIT_OBJECT_0 && waitResult < WAIT_OBJECT_0+handleCount) {
            // a handle was signalled
            livePort = handles[waitResult-WAIT_OBJECT_0];
            if (_LogCFRunLoop) { CFLog(kCFLogLevelDebug, CFSTR("%p (%s)- Resetting event %p"), CFRunLoopGetCurrent(), *_CFGetProgname(), livePort); }
        } else if (waitResult == WAIT_OBJECT_0+handleCount) {
            // windows message received - the CFWindowsMessageQueue will pick this up when
            // the v0 RunLoopSources get their chance
        } else if (waitResult >= WAIT_ABANDONED_0 && waitResult < WAIT_ABANDONED_0+handleCount) {
            // an "abandoned mutex object"
            livePort = handles[waitResult-WAIT_ABANDONED_0];
        } else {
            CFAssert2(waitResult == WAIT_FAILED, __kCFLogAssertion, "%s(): unexpected result from MsgWaitForMultipleObjects: %d", __PRETTY_FUNCTION__, waitResult);
        }
        if (freeHandles)
            CFAllocatorDeallocate(kCFAllocatorSystemDefault, handles);
        timersToCall = __CFRunLoopTimersToFire(rl, rlm);
#endif

        if (CFPORT_NULL == livePort) {
            __CFRunLoopUnlock(rl);
        } else if (livePort == rl->_wakeUpPort) {
            // wakeup
                if (_LogCFRunLoop) { CFLog(kCFLogLevelDebug, CFSTR("wakeupPort was signalled")); }        
            __CFRunLoopUnlock(rl);
        }
#if DEPLOYMENT_TARGET_MACOSX
        else if (livePort == timeoutPort) {
            returnValue = kCFRunLoopRunTimedOut;
            __CFRunLoopUnlock(rl);
        } else if (NULL != (rls = __CFRunLoopModeFindSourceForMachPort(rl, rlm, livePort))) {
            mach_msg_header_t *reply = NULL;
            __CFRunLoopUnlock(rl);
//              mach_msg_scan(msg, 0);
            if (__CFRunLoopDoSource1(rl, rlm, rls, msg, msg->msgh_size, &reply)) {
                sourceHandledThisLoop = true;
            }
//              mach_msg_scan(msg, 1);
            if (NULL != reply) {
                ret = mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0, MACH_PORT_NULL, 0, MACH_PORT_NULL);
//#warning CF: what should be done with the return value?
                CFAllocatorDeallocate(kCFAllocatorSystemDefault, reply);
            }
        } else {
            CFRunLoopTimerRef rlt;
            rlt = __CFRunLoopModeFindTimerForMachPort(rlm, livePort);
            __CFRunLoopUnlock(rl);
            if (NULL != rlt) {
                __CFRunLoopDoTimer(rl, rlm, rlt);
            }
        }
        if (msg != (mach_msg_header_t *)buffer) CFAllocatorDeallocate(kCFAllocatorSystemDefault, msg);
#else
        else if (NULL != (rls = __CFRunLoopModeFindSourceForMachPort(rl, rlm, livePort))) {
            __CFRunLoopUnlock(rl);
                if (_LogCFRunLoop) { CFLog(kCFLogLevelDebug, CFSTR("Source %@ was signalled"), rls); }
            if (__CFRunLoopDoSource1(rl, rlm, rls)) {
                sourceHandledThisLoop = true;
            }
        }
#endif

        __CFRunLoopModeUnlock(rlm);     // locks must be taken in order
        __CFRunLoopLock(rl);
        __CFRunLoopModeLock(rlm);
        if (sourceHandledThisLoop && stopAfterHandle) {
            returnValue = kCFRunLoopRunHandledSource;
        // If we're about to timeout, but we just did a zero-timeout poll that only found our own
        // internal wakeup signal on the first look at the portset, we'll go around the loop one
        // more time, so as not to starve a v1 source that was just added along with a runloop wakeup.
        } else if (0 != returnValue || (uint64_t)termTSR <= __CFReadTSR()) {
            returnValue = kCFRunLoopRunTimedOut;
        } else if (__CFRunLoopIsStopped(rl)) {
            returnValue = kCFRunLoopRunStopped;
        } else if (rlm->_stopped) {
            rlm->_stopped = false;
            returnValue = kCFRunLoopRunStopped;
        } else if (!waitIfEmpty && __CFRunLoopModeIsEmpty(rl, rlm)) {
            returnValue = kCFRunLoopRunFinished;
        }
        __CFRunLoopUnlock(rl);
        if (0 != returnValue) {
#if DEPLOYMENT_TARGET_MACOSX
            if (MACH_PORT_NULL != timeoutPort) {
                if (!destroyWaitSet) __CFPortSetRemove(timeoutPort, waitSet);
                mk_timer_destroy(timeoutPort);
            }
#endif
            return returnValue;
        }
        firstPass = false;
    }
}

SInt32 CFRunLoopRunSpecific(CFRunLoopRef rl, CFStringRef modeName, CFTimeInterval seconds, Boolean returnAfterSourceHandled) {     /* DOES CALLOUT */
    CHECK_FOR_FORK();
    if (__CFRunLoopIsDeallocating(rl)) return kCFRunLoopRunFinished;
    __CFRunLoopLock(rl);
    CFRunLoopModeRef currentMode = __CFRunLoopFindMode(rl, modeName, false);
    if (NULL == currentMode || __CFRunLoopModeIsEmpty(rl, currentMode)) {
        if (currentMode) __CFRunLoopModeUnlock(currentMode);
        __CFRunLoopUnlock(rl);
        return kCFRunLoopRunFinished;
    }
    uint32_t *previousStopped = (uint32_t *)rl->_stopped;
    rl->_stopped = CFAllocatorAllocate(kCFAllocatorSystemDefault, 4 * sizeof(uint32_t), 0);
    rl->_stopped[0] = 0x4346524C;
    rl->_stopped[1] = 0x4346524C; // 'CFRL'
    rl->_stopped[2] = 0x00000000; // here the value is stored
    rl->_stopped[3] = 0x4346524C;
    CFRunLoopModeRef previousMode = rl->_currentMode;
    rl->_currentMode = currentMode;
    __CFRunLoopUnlock(rl);
    int32_t result;
    __CFRunLoopDoObservers(rl, currentMode, kCFRunLoopEntry);
    result = __CFRunLoopRun(rl, currentMode, seconds, returnAfterSourceHandled, false);
    __CFRunLoopDoObservers(rl, currentMode, kCFRunLoopExit);
    __CFRunLoopModeUnlock(currentMode);
    __CFRunLoopLock(rl);
    CFAllocatorDeallocate(kCFAllocatorSystemDefault, (uint32_t *)rl->_stopped);
    rl->_stopped = previousStopped;
    rl->_currentMode = previousMode;
    __CFRunLoopUnlock(rl);
    return result;
}

void CFRunLoopRun(void) {       /* DOES CALLOUT */
    int32_t result;
    do {
        result = CFRunLoopRunSpecific(CFRunLoopGetCurrent(), kCFRunLoopDefaultMode, 1.0e10, false);
        CHECK_FOR_FORK();
    } while (kCFRunLoopRunStopped != result && kCFRunLoopRunFinished != result);
}

SInt32 CFRunLoopRunInMode(CFStringRef modeName, CFTimeInterval seconds, Boolean returnAfterSourceHandled) {     /* DOES CALLOUT */
    CHECK_FOR_FORK();
    return CFRunLoopRunSpecific(CFRunLoopGetCurrent(), modeName, seconds, returnAfterSourceHandled);
}

static void __CFRunLoopFindMinTimer(const void *value, void *ctx) {
    CFRunLoopTimerRef rlt = (CFRunLoopTimerRef)value;
    if (__CFIsValid(rlt)) {
        CFRunLoopTimerRef *result = ctx;
        if (NULL == *result || rlt->_fireTSR < (*result)->_fireTSR) {
            *result = rlt;
        }
    }
}

static int64_t __CFRunLoopGetNextTimerFireTSR(CFRunLoopRef rl, CFRunLoopModeRef rlm) {
    CFRunLoopTimerRef result = NULL;
    int64_t fireTime = 0;
    if (rlm) {
        if (NULL != rlm->_timers && 0 < CFSetGetCount(rlm->_timers)) {
            __CFRunLoopTimerFireTSRLock();
            CFSetApplyFunction(rlm->_timers, (__CFRunLoopFindMinTimer), &result);
            if (result)
                fireTime = result->_fireTSR;
            __CFRunLoopTimerFireTSRUnlock();
        }
        if (NULL != rlm->_submodes) {
            CFIndex idx, cnt;
            for (idx = 0, cnt = CFArrayGetCount(rlm->_submodes); idx < cnt; idx++) {
                CFStringRef modeName = (CFStringRef)CFArrayGetValueAtIndex(rlm->_submodes, idx);
                CFRunLoopModeRef subrlm;
                subrlm = __CFRunLoopFindMode(rl, modeName, false);
                if (NULL != subrlm) {
                    int64_t newFireTime = __CFRunLoopGetNextTimerFireTSR(rl, subrlm);
                    __CFRunLoopModeUnlock(subrlm);
                    if (fireTime == 0 || (newFireTime != 0 && newFireTime < fireTime))
                        fireTime = newFireTime;
                }
            }
        }
        __CFRunLoopModeUnlock(rlm);
    }
    return fireTime;
}

CFAbsoluteTime CFRunLoopGetNextTimerFireDate(CFRunLoopRef rl, CFStringRef modeName) {
    CHECK_FOR_FORK();
    CFRunLoopModeRef rlm;
    int64_t fireTSR;
    __CFRunLoopLock(rl);
    rlm = __CFRunLoopFindMode(rl, modeName, false);
    __CFRunLoopUnlock(rl);
    fireTSR = __CFRunLoopGetNextTimerFireTSR(rl, rlm);
    int64_t now2 = (int64_t)mach_absolute_time();
    CFAbsoluteTime now1 = CFAbsoluteTimeGetCurrent();
    return (0 == fireTSR) ? 0.0 : (now1 + __CFTSRToTimeInterval(fireTSR - now2));
}

Boolean CFRunLoopIsWaiting(CFRunLoopRef rl) {
    CHECK_FOR_FORK();
    return __CFRunLoopIsSleeping(rl);
}

void CFRunLoopWakeUp(CFRunLoopRef rl) {
    CHECK_FOR_FORK();
#if DEPLOYMENT_TARGET_MACOSX
    kern_return_t ret;
    /* We unconditionally try to send the message, since we don't want
     * to lose a wakeup, but the send may fail if there is already a
     * wakeup pending, since the queue length is 1. */
    ret = __CFSendTrivialMachMessage(rl->_wakeUpPort, 0, MACH_SEND_TIMEOUT, 0);
    if (ret != MACH_MSG_SUCCESS && ret != MACH_SEND_TIMED_OUT) {
        HALT;
    }
#else
    SetEvent(rl->_wakeUpPort);
#endif
}

void CFRunLoopStop(CFRunLoopRef rl) {
    CHECK_FOR_FORK();
    __CFRunLoopLock(rl);
    __CFRunLoopSetStopped(rl);
    __CFRunLoopUnlock(rl);
    CFRunLoopWakeUp(rl);
}

CF_EXPORT void _CFRunLoopStopMode(CFRunLoopRef rl, CFStringRef modeName) {
    CHECK_FOR_FORK();
    CFRunLoopModeRef rlm;
    __CFRunLoopLock(rl);
    rlm = __CFRunLoopFindMode(rl, modeName, true);
    __CFRunLoopUnlock(rl);
    if (NULL != rlm) {
        rlm->_stopped = true;
        __CFRunLoopModeUnlock(rlm);
    }
    CFRunLoopWakeUp(rl);
}

CF_EXPORT Boolean _CFRunLoopModeContainsMode(CFRunLoopRef rl, CFStringRef modeName, CFStringRef candidateContainedName) {
    CHECK_FOR_FORK();
    CFRunLoopModeRef rlm;
    if (modeName == kCFRunLoopCommonModes || candidateContainedName == kCFRunLoopCommonModes) {
        return false;
    } else if (CFEqual(modeName, candidateContainedName)) {
        return true;
    }
    __CFRunLoopLock(rl);
    rlm = __CFRunLoopFindMode(rl, modeName, true);
    __CFRunLoopUnlock(rl);
    if (NULL != rlm) {
        CFArrayRef submodes;
        if (NULL == rlm->_submodes) {
            __CFRunLoopModeUnlock(rlm);
            return false;
        }
        if (CFArrayContainsValue(rlm->_submodes, CFRangeMake(0, CFArrayGetCount(rlm->_submodes)), candidateContainedName)) {
            __CFRunLoopModeUnlock(rlm);
            return true;
        }
        submodes = (NULL != rlm->_submodes && 0 < CFArrayGetCount(rlm->_submodes)) ? CFArrayCreateCopy(kCFAllocatorSystemDefault, rlm->_submodes) : NULL;
        __CFRunLoopModeUnlock(rlm);
        if (NULL != submodes) {
            CFIndex idx, cnt;
            for (idx = 0, cnt = CFArrayGetCount(submodes); idx < cnt; idx++) {
                CFStringRef subname = (CFStringRef)CFArrayGetValueAtIndex(submodes, idx);
                if (_CFRunLoopModeContainsMode(rl, subname, candidateContainedName)) {
                    CFRelease(submodes);
                    return true;
                }
            }
            CFRelease(submodes);
        }
    }
    return false;
}

CF_EXPORT void _CFRunLoopAddModeToMode(CFRunLoopRef rl, CFStringRef modeName, CFStringRef toModeName) {
    CHECK_FOR_FORK();
    CFRunLoopModeRef rlm;
    if (__CFRunLoopIsDeallocating(rl)) return;
    // should really do a recursive check here, to make sure that a cycle isn't
    // introduced; of course, if that happens, you aren't going to get very far.
    if (modeName == kCFRunLoopCommonModes || toModeName == kCFRunLoopCommonModes || CFEqual(modeName, toModeName)) {
        return;
    } else {
        __CFRunLoopLock(rl);
        rlm = __CFRunLoopFindMode(rl, toModeName, true);
        __CFRunLoopUnlock(rl);
        if (NULL != rlm) {
            if (NULL == rlm->_submodes) {
                rlm->_submodes = CFArrayCreateMutable(CFGetAllocator(rlm), 0, &kCFTypeArrayCallBacks);
            }
            if (!CFArrayContainsValue(rlm->_submodes, CFRangeMake(0, CFArrayGetCount(rlm->_submodes)), modeName)) {
                CFArrayAppendValue(rlm->_submodes, modeName);
            }
            __CFRunLoopModeUnlock(rlm);
        }
    }
}

CF_EXPORT void _CFRunLoopRemoveModeFromMode(CFRunLoopRef rl, CFStringRef modeName, CFStringRef fromModeName) {
    CHECK_FOR_FORK();
    CFRunLoopModeRef rlm;
    // should really do a recursive check here, to make sure that a cycle isn't
    // introduced; of course, if that happens, you aren't going to get very far.
    if (modeName == kCFRunLoopCommonModes || fromModeName == kCFRunLoopCommonModes || CFEqual(modeName, fromModeName)) {
        return;
    } else {
        __CFRunLoopLock(rl);
        rlm = __CFRunLoopFindMode(rl, fromModeName, true);
        __CFRunLoopUnlock(rl);
        if (NULL != rlm) {
            if (NULL != rlm->_submodes) {
                CFIndex idx, cnt = CFArrayGetCount(rlm->_submodes);
                idx = CFArrayGetFirstIndexOfValue(rlm->_submodes, CFRangeMake(0, cnt), modeName);
                if (0 <= idx) CFArrayRemoveValueAtIndex(rlm->_submodes, idx);
            }
            __CFRunLoopModeUnlock(rlm);
        }
    }
}

Boolean CFRunLoopContainsSource(CFRunLoopRef rl, CFRunLoopSourceRef rls, CFStringRef modeName) {
    CHECK_FOR_FORK();
    CFRunLoopModeRef rlm;
    Boolean hasValue = false;
    __CFRunLoopLock(rl);
    if (modeName == kCFRunLoopCommonModes) {
        if (NULL != rl->_commonModeItems) {
            hasValue = CFSetContainsValue(rl->_commonModeItems, rls);
        }
        __CFRunLoopUnlock(rl);
    } else {
        rlm = __CFRunLoopFindMode(rl, modeName, false);
        __CFRunLoopUnlock(rl);
        if (NULL != rlm && NULL != rlm->_sources) {
            hasValue = CFSetContainsValue(rlm->_sources, rls);
            __CFRunLoopModeUnlock(rlm);
        } else if (NULL != rlm) {
            __CFRunLoopModeUnlock(rlm);
        }
    }
    return hasValue;
}

void CFRunLoopAddSource(CFRunLoopRef rl, CFRunLoopSourceRef rls, CFStringRef modeName) {        /* DOES CALLOUT */
    CHECK_FOR_FORK();
    CFRunLoopModeRef rlm;
    if (__CFRunLoopIsDeallocating(rl)) return;
    if (!__CFIsValid(rls)) return;
    __CFRunLoopLock(rl);
    if (modeName == kCFRunLoopCommonModes) {
        CFSetRef set = rl->_commonModes ? CFSetCreateCopy(kCFAllocatorSystemDefault, rl->_commonModes) : NULL;
        if (NULL == rl->_commonModeItems) {
            rl->_commonModeItems = CFSetCreateMutable(CFGetAllocator(rl), 0, &kCFTypeSetCallBacks);
            _CFSetSetCapacity(rl->_commonModeItems, 20);
        }
        CFSetAddValue(rl->_commonModeItems, rls);
        __CFRunLoopUnlock(rl);
        if (NULL != set) {
            CFTypeRef context[2] = {rl, rls};
            /* add new item to all common-modes */
            CFSetApplyFunction(set, (__CFRunLoopAddItemToCommonModes), (void *)context);
            CFRelease(set);
        }
    } else {
        rlm = __CFRunLoopFindMode(rl, modeName, true);
        __CFRunLoopUnlock(rl);
        if (NULL != rlm && NULL == rlm->_sources) {
            rlm->_sources = CFSetCreateMutable(CFGetAllocator(rlm), 0, &kCFTypeSetCallBacks);
            _CFSetSetCapacity(rlm->_sources, 10);
        }
        if (NULL != rlm && !CFSetContainsValue(rlm->_sources, rls)) {
            CFSetAddValue(rlm->_sources, rls);
            __CFRunLoopModeUnlock(rlm);
            __CFRunLoopSourceSchedule(rls, rl, rlm);    /* DOES CALLOUT */
        } else if (NULL != rlm) {
            __CFRunLoopModeUnlock(rlm);
        }
    }
}

void CFRunLoopRemoveSource(CFRunLoopRef rl, CFRunLoopSourceRef rls, CFStringRef modeName) {     /* DOES CALLOUT */
    CHECK_FOR_FORK();
    CFRunLoopModeRef rlm;
    __CFRunLoopLock(rl);
    if (modeName == kCFRunLoopCommonModes) {
        if (NULL != rl->_commonModeItems && CFSetContainsValue(rl->_commonModeItems, rls)) {
            CFSetRef set = rl->_commonModes ? CFSetCreateCopy(kCFAllocatorSystemDefault, rl->_commonModes) : NULL;
            CFSetRemoveValue(rl->_commonModeItems, rls);
            __CFRunLoopUnlock(rl);
            if (NULL != set) {
                CFTypeRef context[2] = {rl, rls};
                /* remove new item from all common-modes */
                CFSetApplyFunction(set, (__CFRunLoopRemoveItemFromCommonModes), (void *)context);
                CFRelease(set);
            }
        } else {
            __CFRunLoopUnlock(rl);
        }
    } else {
        rlm = __CFRunLoopFindMode(rl, modeName, false);
        __CFRunLoopUnlock(rl);
        if (NULL != rlm && NULL != rlm->_sources && CFSetContainsValue(rlm->_sources, rls)) {
            CFRetain(rls);
            CFSetRemoveValue(rlm->_sources, rls);
            __CFRunLoopModeUnlock(rlm);
            __CFRunLoopSourceCancel(rls, rl, rlm);      /* DOES CALLOUT */
            CFRelease(rls);
        } else if (NULL != rlm) {
            __CFRunLoopModeUnlock(rlm);
        }
    }
}

static void __CFRunLoopRemoveSourcesFromCommonMode(const void *value, void *ctx) {
    CFStringRef modeName = (CFStringRef)value;
    CFRunLoopRef rl = (CFRunLoopRef)ctx;
    __CFRunLoopRemoveAllSources(rl, modeName);
}

static void __CFRunLoopRemoveSourceFromMode(const void *value, void *ctx) {
    CFRunLoopSourceRef rls = (CFRunLoopSourceRef)value;
    CFRunLoopRef rl = (CFRunLoopRef)(((CFTypeRef *)ctx)[0]);
    CFStringRef modeName = (CFStringRef)(((CFTypeRef *)ctx)[1]);
    CFRunLoopRemoveSource(rl, rls, modeName);
}

static void __CFRunLoopRemoveAllSources(CFRunLoopRef rl, CFStringRef modeName) {
    CHECK_FOR_FORK();
    CFRunLoopModeRef rlm;
    __CFRunLoopLock(rl);
    if (modeName == kCFRunLoopCommonModes) {
        if (NULL != rl->_commonModeItems) {
            CFSetRef set = rl->_commonModes ? CFSetCreateCopy(kCFAllocatorSystemDefault, rl->_commonModes) : NULL;
            __CFRunLoopUnlock(rl);
            if (NULL != set) {
                CFSetApplyFunction(set, (__CFRunLoopRemoveSourcesFromCommonMode), (void *)rl);
                CFRelease(set);
            }
        } else {
            __CFRunLoopUnlock(rl);
        }
    } else {
        rlm = __CFRunLoopFindMode(rl, modeName, false);
        __CFRunLoopUnlock(rl);
        if (NULL != rlm && NULL != rlm->_sources) {
            CFSetRef set = CFSetCreateCopy(kCFAllocatorSystemDefault, rlm->_sources);
            __CFRunLoopModeUnlock(rlm);
            CFTypeRef context[2] = {rl, modeName};
            CFSetApplyFunction(set, (__CFRunLoopRemoveSourceFromMode), (void *)context);
            CFRelease(set);
        } else if (NULL != rlm) {
            __CFRunLoopModeUnlock(rlm);
        }
    }
}

Boolean CFRunLoopContainsObserver(CFRunLoopRef rl, CFRunLoopObserverRef rlo, CFStringRef modeName) {
    CHECK_FOR_FORK();
    CFRunLoopModeRef rlm;
    Boolean hasValue = false;
    __CFRunLoopLock(rl);
    if (modeName == kCFRunLoopCommonModes) {
        if (NULL != rl->_commonModeItems) {
            hasValue = CFSetContainsValue(rl->_commonModeItems, rlo);
        }
        __CFRunLoopUnlock(rl);
    } else {
        rlm = __CFRunLoopFindMode(rl, modeName, false);
        __CFRunLoopUnlock(rl);
        if (NULL != rlm && NULL != rlm->_observers) {
            hasValue = CFSetContainsValue(rlm->_observers, rlo);
            __CFRunLoopModeUnlock(rlm);
        } else if (NULL != rlm) {
            __CFRunLoopModeUnlock(rlm);
        }
    }
    return hasValue;
}

void CFRunLoopAddObserver(CFRunLoopRef rl, CFRunLoopObserverRef rlo, CFStringRef modeName) {
    CHECK_FOR_FORK();
    CFRunLoopModeRef rlm;
    if (__CFRunLoopIsDeallocating(rl)) return;
    if (!__CFIsValid(rlo) || (NULL != rlo->_runLoop && rlo->_runLoop != rl)) return;
    __CFRunLoopLock(rl);
    if (modeName == kCFRunLoopCommonModes) {
        CFSetRef set = rl->_commonModes ? CFSetCreateCopy(kCFAllocatorSystemDefault, rl->_commonModes) : NULL;
        if (NULL == rl->_commonModeItems) {
            rl->_commonModeItems = CFSetCreateMutable(CFGetAllocator(rl), 0, &kCFTypeSetCallBacks);
        }
        CFSetAddValue(rl->_commonModeItems, rlo);
        __CFRunLoopUnlock(rl);
        if (NULL != set) {
            CFTypeRef context[2] = {rl, rlo};
            /* add new item to all common-modes */
            CFSetApplyFunction(set, (__CFRunLoopAddItemToCommonModes), (void *)context);
            CFRelease(set);
        }
    } else {
        rlm = __CFRunLoopFindMode(rl, modeName, true);
        __CFRunLoopUnlock(rl);
        if (NULL != rlm && NULL == rlm->_observers) {
            rlm->_observers = CFSetCreateMutable(CFGetAllocator(rlm), 0, &kCFTypeSetCallBacks);
        }
        if (NULL != rlm && !CFSetContainsValue(rlm->_observers, rlo)) {
            CFSetAddValue(rlm->_observers, rlo);
            __CFRunLoopModeUnlock(rlm);
            __CFRunLoopObserverSchedule(rlo, rl, rlm);
        } else if (NULL != rlm) {
            __CFRunLoopModeUnlock(rlm);
        }
    }
}

void CFRunLoopRemoveObserver(CFRunLoopRef rl, CFRunLoopObserverRef rlo, CFStringRef modeName) {
    CHECK_FOR_FORK();
    CFRunLoopModeRef rlm;
    __CFRunLoopLock(rl);
    if (modeName == kCFRunLoopCommonModes) {
        if (NULL != rl->_commonModeItems && CFSetContainsValue(rl->_commonModeItems, rlo)) {
            CFSetRef set = rl->_commonModes ? CFSetCreateCopy(kCFAllocatorSystemDefault, rl->_commonModes) : NULL;
            CFSetRemoveValue(rl->_commonModeItems, rlo);
            __CFRunLoopUnlock(rl);
            if (NULL != set) {
                CFTypeRef context[2] = {rl, rlo};
                /* remove new item from all common-modes */
                CFSetApplyFunction(set, (__CFRunLoopRemoveItemFromCommonModes), (void *)context);
                CFRelease(set);
            }
        } else {
            __CFRunLoopUnlock(rl);
        }
    } else {
        rlm = __CFRunLoopFindMode(rl, modeName, false);
        __CFRunLoopUnlock(rl);
        if (NULL != rlm && NULL != rlm->_observers && CFSetContainsValue(rlm->_observers, rlo)) {
            CFRetain(rlo);
            CFSetRemoveValue(rlm->_observers, rlo);
            __CFRunLoopModeUnlock(rlm);
            __CFRunLoopObserverCancel(rlo, rl, rlm);
            CFRelease(rlo);
        } else if (NULL != rlm) {
            __CFRunLoopModeUnlock(rlm);
        }
    }
}

Boolean CFRunLoopContainsTimer(CFRunLoopRef rl, CFRunLoopTimerRef rlt, CFStringRef modeName) {
    CHECK_FOR_FORK();
    CFRunLoopModeRef rlm;
    Boolean hasValue = false;
    __CFRunLoopLock(rl);
    if (modeName == kCFRunLoopCommonModes) {
        if (NULL != rl->_commonModeItems) {
            hasValue = CFSetContainsValue(rl->_commonModeItems, rlt);
        }
        __CFRunLoopUnlock(rl);
    } else {
        rlm = __CFRunLoopFindMode(rl, modeName, false);
        __CFRunLoopUnlock(rl);
        if (NULL != rlm && NULL != rlm->_timers) {
            hasValue = CFSetContainsValue(rlm->_timers, rlt);
            __CFRunLoopModeUnlock(rlm);
        } else if (NULL != rlm) {
            __CFRunLoopModeUnlock(rlm);
        }
    }
    return hasValue;
}

void CFRunLoopAddTimer(CFRunLoopRef rl, CFRunLoopTimerRef rlt, CFStringRef modeName) {
    CHECK_FOR_FORK();
    CFRunLoopModeRef rlm;
    if (__CFRunLoopIsDeallocating(rl)) return;
    if (!__CFIsValid(rlt) || (NULL != rlt->_runLoop && rlt->_runLoop != rl)) return;
    __CFRunLoopLock(rl);
    if (modeName == kCFRunLoopCommonModes) {
        CFSetRef set = rl->_commonModes ? CFSetCreateCopy(kCFAllocatorSystemDefault, rl->_commonModes) : NULL;
        if (NULL == rl->_commonModeItems) {
            rl->_commonModeItems = CFSetCreateMutable(CFGetAllocator(rl), 0, &kCFTypeSetCallBacks);
        }
        CFSetAddValue(rl->_commonModeItems, rlt);
        __CFRunLoopUnlock(rl);
        if (NULL != set) {
            CFTypeRef context[2] = {rl, rlt};
            /* add new item to all common-modes */
            CFSetApplyFunction(set, (__CFRunLoopAddItemToCommonModes), (void *)context);
            CFRelease(set);
        }
    } else {
        rlm = __CFRunLoopFindMode(rl, modeName, true);
        __CFRunLoopUnlock(rl);
        if (NULL != rlm && NULL == rlm->_timers) {
            rlm->_timers = CFSetCreateMutable(CFGetAllocator(rlm), 0, &kCFTypeSetCallBacks);
        }
        if (NULL != rlm && !CFSetContainsValue(rlm->_timers, rlt)) {
            CFSetAddValue(rlm->_timers, rlt);
            __CFRunLoopModeUnlock(rlm);
            __CFRunLoopTimerSchedule(rlt, rl, rlm);
        } else if (NULL != rlm) {
            __CFRunLoopModeUnlock(rlm);
        }
    }
}

void CFRunLoopRemoveTimer(CFRunLoopRef rl, CFRunLoopTimerRef rlt, CFStringRef modeName) {
    CHECK_FOR_FORK();
    CFRunLoopModeRef rlm;
    __CFRunLoopLock(rl);
    if (modeName == kCFRunLoopCommonModes) {
        if (NULL != rl->_commonModeItems && CFSetContainsValue(rl->_commonModeItems, rlt)) {
            CFSetRef set = rl->_commonModes ? CFSetCreateCopy(kCFAllocatorSystemDefault, rl->_commonModes) : NULL;
            CFSetRemoveValue(rl->_commonModeItems, rlt);
            __CFRunLoopUnlock(rl);
            if (NULL != set) {
                CFTypeRef context[2] = {rl, rlt};
                /* remove new item from all common-modes */
                CFSetApplyFunction(set, (__CFRunLoopRemoveItemFromCommonModes), (void *)context);
                CFRelease(set);
            }
        } else {
            __CFRunLoopUnlock(rl);
        }
    } else {
        rlm = __CFRunLoopFindMode(rl, modeName, false);
        __CFRunLoopUnlock(rl);
        if (NULL != rlm && NULL != rlm->_timers && CFSetContainsValue(rlm->_timers, rlt)) {
            CFRetain(rlt);
            CFSetRemoveValue(rlm->_timers, rlt);
            __CFRunLoopModeUnlock(rlm);
            __CFRunLoopTimerCancel(rlt, rl, rlm);
            CFRelease(rlt);
        } else if (NULL != rlm) {
            __CFRunLoopModeUnlock(rlm);
        }
    }
}


/* CFRunLoopSource */

static Boolean __CFRunLoopSourceEqual(CFTypeRef cf1, CFTypeRef cf2) {   /* DOES CALLOUT */
    CFRunLoopSourceRef rls1 = (CFRunLoopSourceRef)cf1;
    CFRunLoopSourceRef rls2 = (CFRunLoopSourceRef)cf2;
    if (rls1 == rls2) return true;
    if (rls1->_order != rls2->_order) return false;
    if (rls1->_context.version0.version != rls2->_context.version0.version) return false;
    if (rls1->_context.version0.hash != rls2->_context.version0.hash) return false;
    if (rls1->_context.version0.equal != rls2->_context.version0.equal) return false;
    if (0 == rls1->_context.version0.version && rls1->_context.version0.perform != rls2->_context.version0.perform) return false;
    if (1 == rls1->_context.version0.version && rls1->_context.version1.perform != rls2->_context.version1.perform) return false;
    if (rls1->_context.version0.equal)
        return rls1->_context.version0.equal(rls1->_context.version0.info, rls2->_context.version0.info);
    return (rls1->_context.version0.info == rls2->_context.version0.info);
}

static CFHashCode __CFRunLoopSourceHash(CFTypeRef cf) { /* DOES CALLOUT */
    CFRunLoopSourceRef rls = (CFRunLoopSourceRef)cf;
    if (rls->_context.version0.hash)
        return rls->_context.version0.hash(rls->_context.version0.info);
    return (CFHashCode)rls->_context.version0.info;
}

static CFStringRef __CFRunLoopSourceCopyDescription(CFTypeRef cf) {     /* DOES CALLOUT */
    CFRunLoopSourceRef rls = (CFRunLoopSourceRef)cf;
    CFStringRef result;
    CFStringRef contextDesc = NULL;
    if (NULL != rls->_context.version0.copyDescription) {
        contextDesc = rls->_context.version0.copyDescription(rls->_context.version0.info);
    }
    if (NULL == contextDesc) {
        void *addr = rls->_context.version0.version == 0 ? (void *)rls->_context.version0.perform : (rls->_context.version0.version == 1 ? (void *)rls->_context.version1.perform : NULL);
#if DEPLOYMENT_TARGET_MACOSX
        Dl_info info;
        const char *name = (dladdr(addr, &info) && info.dli_saddr == addr && info.dli_sname) ? info.dli_sname : "???";
        contextDesc = CFStringCreateWithFormat(CFGetAllocator(rls), NULL, CFSTR("<CFRunLoopSource context>{version = %ld, info = %p, callout = %s (%p)}"), rls->_context.version0.version, rls->_context.version0.info, name, addr);
#else
#error Unknown or unspecified DEPLOYMENT_TARGET
#endif
    }
result = CFStringCreateWithFormat(CFGetAllocator(rls), NULL, CFSTR("<CFRunLoopSource %p [%p]>{locked = %s, signalled = %s, valid = %s, order = %d, context = %@}"), cf, CFGetAllocator(rls), lockCount(rls->_lock) ? "Yes" : "No", __CFRunLoopSourceIsSignaled(rls) ? "Yes" : "No", __CFIsValid(rls) ? "Yes" : "No", rls->_order, contextDesc);
    CFRelease(contextDesc);
    return result;
}

static void __CFRunLoopSourceDeallocate(CFTypeRef cf) { /* DOES CALLOUT */
    CFRunLoopSourceRef rls = (CFRunLoopSourceRef)cf;
    CFRunLoopSourceInvalidate(rls);
    if (rls->_context.version0.release) {
        rls->_context.version0.release(rls->_context.version0.info);
    }
}

static const CFRuntimeClass __CFRunLoopSourceClass = {
    _kCFRuntimeScannedObject,
    "CFRunLoopSource",
    NULL,      // init
    NULL,      // copy
    __CFRunLoopSourceDeallocate,
    __CFRunLoopSourceEqual,
    __CFRunLoopSourceHash,
    NULL,      // 
    __CFRunLoopSourceCopyDescription
};

__private_extern__ void __CFRunLoopSourceInitialize(void) {
    __kCFRunLoopSourceTypeID = _CFRuntimeRegisterClass(&__CFRunLoopSourceClass);
}

CFTypeID CFRunLoopSourceGetTypeID(void) {
    return __kCFRunLoopSourceTypeID;
}

CFRunLoopSourceRef CFRunLoopSourceCreate(CFAllocatorRef allocator, CFIndex order, CFRunLoopSourceContext *context) {
    CHECK_FOR_FORK();
    CFRunLoopSourceRef memory;
    uint32_t size;
    if (NULL == context) HALT;
    size = sizeof(struct __CFRunLoopSource) - sizeof(CFRuntimeBase);
    memory = (CFRunLoopSourceRef)_CFRuntimeCreateInstance(allocator, __kCFRunLoopSourceTypeID, size, NULL);
    if (NULL == memory) {
        return NULL;
    }
    __CFSetValid(memory);
    __CFRunLoopSourceUnsetSignaled(memory);
    CF_SPINLOCK_INIT_FOR_STRUCTS(memory->_lock);
    memory->_bits = 0;
    memory->_order = order;
    memory->_runLoops = NULL;
    size = 0;
    switch (context->version) {
    case 0:
        size = sizeof(CFRunLoopSourceContext);
        break;
    case 1:
        size = sizeof(CFRunLoopSourceContext1);
        break;
#if DEPLOYMENT_TARGET_MACOSX
    case 2:
        size = sizeof(CFRunLoopSourceContext2);
        break;
#endif
    }
    CF_WRITE_BARRIER_MEMMOVE(&memory->_context, context, size);
    if (context->retain) {
        memory->_context.version0.info = (void *)context->retain(context->info);
    }
    return memory;
}

CFIndex CFRunLoopSourceGetOrder(CFRunLoopSourceRef rls) {
    CHECK_FOR_FORK();
    __CFGenericValidateType(rls, __kCFRunLoopSourceTypeID);
    return rls->_order;
}

static void __CFRunLoopSourceRemoveFromRunLoop(const void *value, void *context) {
    CFRunLoopRef rl = (CFRunLoopRef)value;
    CFTypeRef *params = context;
    CFRunLoopSourceRef rls = (CFRunLoopSourceRef)params[0];
    CFArrayRef array;
    CFIndex idx;
    if (rl == params[1]) return;
    array = CFRunLoopCopyAllModes(rl);
    for (idx = CFArrayGetCount(array); idx--;) {
        CFStringRef modeName = CFArrayGetValueAtIndex(array, idx);
        CFRunLoopRemoveSource(rl, rls, modeName);
    }
    CFRunLoopRemoveSource(rl, rls, kCFRunLoopCommonModes);
    CFRelease(array);
    params[1] = rl;
}

void CFRunLoopSourceInvalidate(CFRunLoopSourceRef rls) {
    CHECK_FOR_FORK();
    __CFGenericValidateType(rls, __kCFRunLoopSourceTypeID);
    CFRetain(rls);
    __CFRunLoopSourceLock(rls);
    if (__CFIsValid(rls)) {
        __CFUnsetValid(rls);
        __CFRunLoopSourceUnsetSignaled(rls);
        if (NULL != rls->_runLoops) {
            CFTypeRef params[2] = {rls, NULL};
            CFBagRef bag = CFBagCreateCopy(kCFAllocatorSystemDefault, rls->_runLoops);
            CFRelease(rls->_runLoops);
            rls->_runLoops = NULL;
            __CFRunLoopSourceUnlock(rls);
            CFBagApplyFunction(bag, (__CFRunLoopSourceRemoveFromRunLoop), params);
            CFRelease(bag);
        } else {
            __CFRunLoopSourceUnlock(rls);
        }
        /* for hashing- and equality-use purposes, can't actually release the context here */
    } else {
        __CFRunLoopSourceUnlock(rls);
    }
    CFRelease(rls);
}

Boolean CFRunLoopSourceIsValid(CFRunLoopSourceRef rls) {
    CHECK_FOR_FORK();
    __CFGenericValidateType(rls, __kCFRunLoopSourceTypeID);
    return __CFIsValid(rls);
}

void CFRunLoopSourceGetContext(CFRunLoopSourceRef rls, CFRunLoopSourceContext *context) {
    CHECK_FOR_FORK();
    __CFGenericValidateType(rls, __kCFRunLoopSourceTypeID);
    CFAssert1(0 == context->version || 1 == context->version, __kCFLogAssertion, "%s(): context version not initialized to 0 or 1", __PRETTY_FUNCTION__);
    CFIndex size = 0;
    switch (context->version) {
    case 0:
        size = sizeof(CFRunLoopSourceContext);
        break;
    case 1:
        size = sizeof(CFRunLoopSourceContext1);
        break;
#if DEPLOYMENT_TARGET_MACOSX
    case 2:
        size = sizeof(CFRunLoopSourceContext2);
        break;
#endif
    }
    memmove(context, &rls->_context, size);
}

void CFRunLoopSourceSignal(CFRunLoopSourceRef rls) {
    CHECK_FOR_FORK();
    __CFRunLoopSourceLock(rls);
    if (__CFIsValid(rls)) {
        __CFRunLoopSourceSetSignaled(rls);
    }
    __CFRunLoopSourceUnlock(rls);
}

Boolean CFRunLoopSourceIsSignalled(CFRunLoopSourceRef rls) {
    CHECK_FOR_FORK();
    __CFRunLoopSourceLock(rls);
    Boolean ret = __CFRunLoopSourceIsSignaled(rls) ? true : false;
    __CFRunLoopSourceUnlock(rls);
    return ret;
}

/* CFRunLoopObserver */

static CFStringRef __CFRunLoopObserverCopyDescription(CFTypeRef cf) {   /* DOES CALLOUT */
    CFRunLoopObserverRef rlo = (CFRunLoopObserverRef)cf;
    CFStringRef result;
    CFStringRef contextDesc = NULL;
    if (NULL != rlo->_context.copyDescription) {
        contextDesc = rlo->_context.copyDescription(rlo->_context.info);
    }
    if (!contextDesc) {
        contextDesc = CFStringCreateWithFormat(CFGetAllocator(rlo), NULL, CFSTR("<CFRunLoopObserver context %p>"), rlo->_context.info);
    }
#if DEPLOYMENT_TARGET_MACOSX
    void *addr = rlo->_callout;
    Dl_info info;
    const char *name = (dladdr(addr, &info) && info.dli_saddr == addr && info.dli_sname) ? info.dli_sname : "???";
    result = CFStringCreateWithFormat(CFGetAllocator(rlo), NULL, CFSTR("<CFRunLoopObserver %p [%p]>{locked = %s, valid = %s, activities = 0x%x, repeats = %s, order = %d, callout = %s (%p), context = %@}"), cf, CFGetAllocator(rlo), lockCount(rlo->_lock) ? "Yes" : "No", __CFIsValid(rlo) ? "Yes" : "No", rlo->_activities, __CFRunLoopObserverRepeats(rlo) ? "Yes" : "No", rlo->_order, name, addr, contextDesc);
#else
#error Unknown or unspecified DEPLOYMENT_TARGET
#endif
    CFRelease(contextDesc);
    return result;
}

static void __CFRunLoopObserverDeallocate(CFTypeRef cf) {       /* DOES CALLOUT */
    CFRunLoopObserverRef rlo = (CFRunLoopObserverRef)cf;
    CFRunLoopObserverInvalidate(rlo);
}

static const CFRuntimeClass __CFRunLoopObserverClass = {
    0,
    "CFRunLoopObserver",
    NULL,      // init
    NULL,      // copy
    __CFRunLoopObserverDeallocate,
    NULL,
    NULL,
    NULL,      // 
    __CFRunLoopObserverCopyDescription
};

__private_extern__ void __CFRunLoopObserverInitialize(void) {
    __kCFRunLoopObserverTypeID = _CFRuntimeRegisterClass(&__CFRunLoopObserverClass);
}

CFTypeID CFRunLoopObserverGetTypeID(void) {
    return __kCFRunLoopObserverTypeID;
}

CFRunLoopObserverRef CFRunLoopObserverCreate(CFAllocatorRef allocator, CFOptionFlags activities, Boolean repeats, CFIndex order, CFRunLoopObserverCallBack callout, CFRunLoopObserverContext *context) {
    CHECK_FOR_FORK();
    CFRunLoopObserverRef memory;
    UInt32 size;
    size = sizeof(struct __CFRunLoopObserver) - sizeof(CFRuntimeBase);
    memory = (CFRunLoopObserverRef)_CFRuntimeCreateInstance(allocator, __kCFRunLoopObserverTypeID, size, NULL);
    if (NULL == memory) {
        return NULL;
    }
    __CFSetValid(memory);
    __CFRunLoopObserverUnsetFiring(memory);
    if (repeats) {
        __CFRunLoopObserverSetRepeats(memory);
    } else {
        __CFRunLoopObserverUnsetRepeats(memory);
    }
    CF_SPINLOCK_INIT_FOR_STRUCTS(memory->_lock);
    memory->_runLoop = NULL;
    memory->_rlCount = 0;
    memory->_activities = activities;
    memory->_order = order;
    memory->_callout = callout;
    if (context) {
        if (context->retain) {
            memory->_context.info = (void *)context->retain(context->info);
        } else {
            memory->_context.info = context->info;
        }
        memory->_context.retain = context->retain;
        memory->_context.release = context->release;
        memory->_context.copyDescription = context->copyDescription;
    } else {
        memory->_context.info = 0;
        memory->_context.retain = 0;
        memory->_context.release = 0;
        memory->_context.copyDescription = 0;
    }
    return memory;
}

CFOptionFlags CFRunLoopObserverGetActivities(CFRunLoopObserverRef rlo) {
    CHECK_FOR_FORK();
    __CFGenericValidateType(rlo, __kCFRunLoopObserverTypeID);
    return rlo->_activities;
}

CFIndex CFRunLoopObserverGetOrder(CFRunLoopObserverRef rlo) {
    CHECK_FOR_FORK();
    __CFGenericValidateType(rlo, __kCFRunLoopObserverTypeID);
    return rlo->_order;
}

Boolean CFRunLoopObserverDoesRepeat(CFRunLoopObserverRef rlo) {
    CHECK_FOR_FORK();
    __CFGenericValidateType(rlo, __kCFRunLoopObserverTypeID);
    return __CFRunLoopObserverRepeats(rlo);
}

void CFRunLoopObserverInvalidate(CFRunLoopObserverRef rlo) {    /* DOES CALLOUT */
    CHECK_FOR_FORK();
    __CFGenericValidateType(rlo, __kCFRunLoopObserverTypeID);
    CFRetain(rlo);
    __CFRunLoopObserverLock(rlo);
    if (__CFIsValid(rlo)) {
        CFRunLoopRef rl = rlo->_runLoop;
        __CFUnsetValid(rlo);
        __CFRunLoopObserverUnlock(rlo);
        if (NULL != rl) {
            CFArrayRef array;
            CFIndex idx;
            array = CFRunLoopCopyAllModes(rl);
            for (idx = CFArrayGetCount(array); idx--;) {
                CFStringRef modeName = CFArrayGetValueAtIndex(array, idx);
                CFRunLoopRemoveObserver(rl, rlo, modeName);
            }
            CFRunLoopRemoveObserver(rl, rlo, kCFRunLoopCommonModes);
            CFRelease(array);
        }
        if (rlo->_context.release)
            rlo->_context.release(rlo->_context.info);  /* CALLOUT */
        rlo->_context.info = NULL;
    } else {
        __CFRunLoopObserverUnlock(rlo);
    }
    CFRelease(rlo);
}

Boolean CFRunLoopObserverIsValid(CFRunLoopObserverRef rlo) {
    CHECK_FOR_FORK();
    return __CFIsValid(rlo);
}

void CFRunLoopObserverGetContext(CFRunLoopObserverRef rlo, CFRunLoopObserverContext *context) {
    CHECK_FOR_FORK();
    __CFGenericValidateType(rlo, __kCFRunLoopObserverTypeID);
    CFAssert1(0 == context->version, __kCFLogAssertion, "%s(): context version not initialized to 0", __PRETTY_FUNCTION__);
    *context = rlo->_context;
}

/* CFRunLoopTimer */

static CFStringRef __CFRunLoopTimerCopyDescription(CFTypeRef cf) {      /* DOES CALLOUT */
    CFRunLoopTimerRef rlt = (CFRunLoopTimerRef)cf;
    CFStringRef result;
    CFStringRef contextDesc = NULL;
    int64_t fireTime;
    __CFRunLoopTimerFireTSRLock();
    fireTime = rlt->_fireTSR;
    __CFRunLoopTimerFireTSRUnlock();
    if (NULL != rlt->_context.copyDescription) {
        contextDesc = rlt->_context.copyDescription(rlt->_context.info);
    }
    if (NULL == contextDesc) {
        contextDesc = CFStringCreateWithFormat(CFGetAllocator(rlt), NULL, CFSTR("<CFRunLoopTimer context %p>"), rlt->_context.info);
    }
    int64_t now2 = (int64_t)mach_absolute_time();
    CFAbsoluteTime now1 = CFAbsoluteTimeGetCurrent();
#if DEPLOYMENT_TARGET_MACOSX
    void *addr = rlt->_callout;
    Dl_info info;
    const char *name = (dladdr(addr, &info) && info.dli_saddr == addr && info.dli_sname) ? info.dli_sname : "???";
    result = CFStringCreateWithFormat(CFGetAllocator(rlt), NULL, CFSTR("<CFRunLoopTimer %p [%p]>{locked = %s, valid = %s, interval = %0.09g, next fire date = %0.09g, order = %d, callout = %s (%p), context = %@}"), cf, CFGetAllocator(rlt), lockCount(rlt->_lock) ? "Yes" : "No", __CFIsValid(rlt) ? "Yes" : "No", __CFTSRToTimeInterval(rlt->_intervalTSR), now1 + __CFTSRToTimeInterval(fireTime - now2), rlt->_order, name, addr, contextDesc);
#else
#error Unknown or unspecified DEPLOYMENT_TARGET
#endif
    CFRelease(contextDesc);
    return result;
}

static void __CFRunLoopTimerDeallocate(CFTypeRef cf) {  /* DOES CALLOUT */
    CFRunLoopTimerRef rlt = (CFRunLoopTimerRef)cf;
    CFRunLoopTimerInvalidate(rlt);      /* DOES CALLOUT */
}

static const CFRuntimeClass __CFRunLoopTimerClass = {
    0,
    "CFRunLoopTimer",
    NULL,      // init
    NULL,      // copy
    __CFRunLoopTimerDeallocate,
    NULL,       // equal
    NULL,
    NULL,      // 
    __CFRunLoopTimerCopyDescription
};

__private_extern__ void __CFRunLoopTimerInitialize(void) {
    __kCFRunLoopTimerTypeID = _CFRuntimeRegisterClass(&__CFRunLoopTimerClass);
}

CFTypeID CFRunLoopTimerGetTypeID(void) {
    return __kCFRunLoopTimerTypeID;
}

CFRunLoopTimerRef CFRunLoopTimerCreate(CFAllocatorRef allocator, CFAbsoluteTime fireDate, CFTimeInterval interval, CFOptionFlags flags, CFIndex order, CFRunLoopTimerCallBack callout, CFRunLoopTimerContext *context) {
    CHECK_FOR_FORK();
    CFRunLoopTimerRef memory;
    UInt32 size;
    size = sizeof(struct __CFRunLoopTimer) - sizeof(CFRuntimeBase);
    memory = (CFRunLoopTimerRef)_CFRuntimeCreateInstance(allocator, __kCFRunLoopTimerTypeID, size, NULL);
    if (NULL == memory) {
        return NULL;
    }
    __CFSetValid(memory);
    __CFRunLoopTimerUnsetFiring(memory);
    __CFRunLoopTimerUnsetDidFire(memory);
    CF_SPINLOCK_INIT_FOR_STRUCTS(memory->_lock);
    memory->_runLoop = NULL;
    memory->_rlCount = 0;
#if DEPLOYMENT_TARGET_MACOSX
    memory->_port = MACH_PORT_NULL;
#endif
    memory->_order = order;
    int64_t now2 = (int64_t)mach_absolute_time();
    CFAbsoluteTime now1 = CFAbsoluteTimeGetCurrent();
    if (3.1556952e+9 < fireDate) fireDate = 3.1556952e+9;
    if (fireDate < now1) {
        memory->_fireTSR = now2;
    } else if (now1 + __CFTSRToTimeInterval(LLONG_MAX) < fireDate) {
        memory->_fireTSR = LLONG_MAX;
    } else {
        memory->_fireTSR = now2 + __CFTimeIntervalToTSR(fireDate - now1);
    }
    if (3.1556952e+9 < interval) interval = 3.1556952e+9;
    if (interval <= 0.0) {
        memory->_intervalTSR = 0;
    } else if (__CFTSRToTimeInterval(LLONG_MAX) < interval) {
        memory->_intervalTSR = LLONG_MAX;
    } else {
        memory->_intervalTSR = __CFTimeIntervalToTSR(interval);
    }
    memory->_callout = callout;
    if (NULL != context) {
        if (context->retain) {
            memory->_context.info = (void *)context->retain(context->info);
        } else {
            memory->_context.info = context->info;
        }
        memory->_context.retain = context->retain;
        memory->_context.release = context->release;
        memory->_context.copyDescription = context->copyDescription;
    } else {
        memory->_context.info = 0;
        memory->_context.retain = 0;
        memory->_context.release = 0;
        memory->_context.copyDescription = 0;
    }
    return memory;
}

CFAbsoluteTime CFRunLoopTimerGetNextFireDate(CFRunLoopTimerRef rlt) {
    CHECK_FOR_FORK();
    int64_t fireTime, result = 0;
    CF_OBJC_FUNCDISPATCH0(__kCFRunLoopTimerTypeID, CFAbsoluteTime, rlt, "_cffireTime");
    __CFGenericValidateType(rlt, __kCFRunLoopTimerTypeID);
    __CFRunLoopTimerFireTSRLock();
    fireTime = rlt->_fireTSR;
    __CFRunLoopTimerFireTSRUnlock();
    __CFRunLoopTimerLock(rlt);
    if (__CFIsValid(rlt)) {
        result = fireTime;
    }
    __CFRunLoopTimerUnlock(rlt);
    int64_t now2 = (int64_t)mach_absolute_time();
    CFAbsoluteTime now1 = CFAbsoluteTimeGetCurrent();
    return (0 == result) ? 0.0 : now1 + __CFTSRToTimeInterval(result - now2);
}

void CFRunLoopTimerSetNextFireDate(CFRunLoopTimerRef rlt, CFAbsoluteTime fireDate) {
    CHECK_FOR_FORK();
    __CFRunLoopTimerFireTSRLock();
    int64_t now2 = (int64_t)mach_absolute_time();
    CFAbsoluteTime now1 = CFAbsoluteTimeGetCurrent();
    if (3.1556952e+9 < fireDate) fireDate = 3.1556952e+9;
    if (fireDate < now1) {
        rlt->_fireTSR = now2;
    } else if (now1 + __CFTSRToTimeInterval(LLONG_MAX) < fireDate) {
        rlt->_fireTSR = LLONG_MAX;
    } else {
        rlt->_fireTSR = now2 + __CFTimeIntervalToTSR(fireDate - now1);
    }
    if (rlt->_runLoop != NULL) {
        __CFRunLoopTimerRescheduleWithAllModes(rlt, rlt->_runLoop);
    }
    __CFRunLoopTimerFireTSRUnlock();
}

CFTimeInterval CFRunLoopTimerGetInterval(CFRunLoopTimerRef rlt) {
    CHECK_FOR_FORK();
    CF_OBJC_FUNCDISPATCH0(__kCFRunLoopTimerTypeID, CFTimeInterval, rlt, "timeInterval");
    __CFGenericValidateType(rlt, __kCFRunLoopTimerTypeID);
    return __CFTSRToTimeInterval(rlt->_intervalTSR);
}

Boolean CFRunLoopTimerDoesRepeat(CFRunLoopTimerRef rlt) {
    CHECK_FOR_FORK();
    __CFGenericValidateType(rlt, __kCFRunLoopTimerTypeID);
    return (0 != rlt->_intervalTSR);
}

CFIndex CFRunLoopTimerGetOrder(CFRunLoopTimerRef rlt) {
    CHECK_FOR_FORK();
    CF_OBJC_FUNCDISPATCH0(__kCFRunLoopTimerTypeID, CFIndex, rlt, "order");
    __CFGenericValidateType(rlt, __kCFRunLoopTimerTypeID);
    return rlt->_order;
}

void CFRunLoopTimerInvalidate(CFRunLoopTimerRef rlt) {  /* DOES CALLOUT */
    CHECK_FOR_FORK();
    CF_OBJC_FUNCDISPATCH0(__kCFRunLoopTimerTypeID, void, rlt, "invalidate");
    __CFGenericValidateType(rlt, __kCFRunLoopTimerTypeID);
    CFRetain(rlt);
    __CFRunLoopTimerLock(rlt);
    if (__CFIsValid(rlt)) {
        CFRunLoopRef rl = rlt->_runLoop;
        void *info = rlt->_context.info;
        __CFUnsetValid(rlt);
#if DEPLOYMENT_TARGET_MACOSX
        __CFRunLoopTimerPortMapLock();
        if (NULL != __CFRLTPortMap) {
            CFDictionaryRemoveValue(__CFRLTPortMap, (void *)(uintptr_t)rlt->_port);
        }
        __CFRunLoopTimerPortMapUnlock();
        mk_timer_destroy(rlt->_port);
        rlt->_port = MACH_PORT_NULL;
#endif
        rlt->_context.info = NULL;
        __CFRunLoopTimerUnlock(rlt);
        if (NULL != rl) {
            CFArrayRef array;
            CFIndex idx;
            array = CFRunLoopCopyAllModes(rl);
            for (idx = CFArrayGetCount(array); idx--;) {
                CFStringRef modeName = CFArrayGetValueAtIndex(array, idx);
                CFRunLoopRemoveTimer(rl, rlt, modeName);
            }
            CFRunLoopRemoveTimer(rl, rlt, kCFRunLoopCommonModes);
            CFRelease(array);
        }
        if (NULL != rlt->_context.release) {
            rlt->_context.release(info);        /* CALLOUT */
        }
    } else {
        __CFRunLoopTimerUnlock(rlt);
    }
    CFRelease(rlt);
}

Boolean CFRunLoopTimerIsValid(CFRunLoopTimerRef rlt) {
    CHECK_FOR_FORK();
    CF_OBJC_FUNCDISPATCH0(__kCFRunLoopTimerTypeID, Boolean, rlt, "isValid");
    __CFGenericValidateType(rlt, __kCFRunLoopTimerTypeID);
    return __CFIsValid(rlt);
}

void CFRunLoopTimerGetContext(CFRunLoopTimerRef rlt, CFRunLoopTimerContext *context) {
    CHECK_FOR_FORK();
    __CFGenericValidateType(rlt, __kCFRunLoopTimerTypeID);
    CFAssert1(0 == context->version, __kCFLogAssertion, "%s(): context version not initialized to 0", __PRETTY_FUNCTION__);
    *context = rlt->_context;
}

#endif