osfmk/kern/kern_types.h

   1 /*
   2  * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31
  32 #ifndef _KERN_KERN_TYPES_H_
  33 #define _KERN_KERN_TYPES_H_
  34
  35 #include <stdint.h>
  36 #include <mach/mach_types.h>
  37 #include <mach/machine/vm_types.h>
  38
  39 #ifdef  KERNEL_PRIVATE
  40
  41 #ifndef MACH_KERNEL_PRIVATE
  42
  43 struct zone ;
  44
  45 #ifndef __LP64__
  46 struct wait_queue { unsigned int opaque[2]; uintptr_t opaquep[2]; } ;
  47 #else
  48 struct wait_queue { unsigned char opaque[32]; };
  49 #endif
  50
  51 #endif  /* MACH_KERNEL_PRIVATE */
  52
  53 typedef struct zone                     *zone_t;
  54 #define         ZONE_NULL                       ((zone_t) 0)
  55
  56 typedef struct wait_queue               *wait_queue_t;
  57 #define         WAIT_QUEUE_NULL         ((wait_queue_t) 0)
  58 #define                 SIZEOF_WAITQUEUE        sizeof(struct wait_queue)
  59
  60 typedef vm_offset_t                     ipc_kobject_t;
  61 #define         IKO_NULL                        ((ipc_kobject_t) 0)
  62
  63 #endif  /* KERNEL_PRIVATE */
  64
  65 typedef void *event_t;          /* wait event */
  66 #define         NO_EVENT                        ((event_t) 0)
  67
  68 typedef uint64_t event64_t;             /* 64 bit wait event */
  69 #define         NO_EVENT64              ((event64_t) 0)
  70 #define         CAST_EVENT64_T(a_ptr)   ((event64_t)((uintptr_t)(a_ptr)))
  71
  72 /*
  73  *      Possible wait_result_t values.
  74  */
  75 typedef int wait_result_t;
  76 #define THREAD_WAITING          -1              /* thread is waiting */
  77 #define THREAD_AWAKENED         0               /* normal wakeup */
  78 #define THREAD_TIMED_OUT        1               /* timeout expired */
  79 #define THREAD_INTERRUPTED      2               /* aborted/interrupted */
  80 #define THREAD_RESTART          3               /* restart operation entirely */
  81 #define THREAD_NOT_WAITING      10              /* thread didn't need to wait */
  82
  83 typedef void (*thread_continue_t)(void *, wait_result_t);
  84 #define THREAD_CONTINUE_NULL    ((thread_continue_t) 0)
  85
  86 /*
  87  * Interruptible flag for waits.
  88  *
  89  * THREAD_UNINT: Uninterruptible wait
  90  *   Wait will only end when someone explicitly wakes up the thread, or if the
  91  *   wait timeout expires.
  92  *
  93  *   Use this state if the system as a whole cannot recover from a thread being
  94  *   interrupted out of the wait.
  95  *
  96  * THREAD_INTERRUPTIBLE:
  97  *    Wait will end if someone explicitly wakes up the thread, the wait timeout
  98  *    expires,  or the current thread is being terminated.
  99  *
 100  *    This value can be used when your operation may not be cleanly restartable
 101  *    for the current process or thread (i.e. the loss of state would be only visible
 102  *    to the current client).  Since the thread is exiting anyways, you're willing
 103  *    to cut the operation short.  The system as a whole must be able to cleanly
 104  *    deal with the interruption (i.e. remain in a consistent and recoverable state).
 105  *
 106  * THREAD_ABORTSAFE:
 107  *    Wait will end if someone explicitly wakes up the thread, the wait timeout
 108  *    expires, the current thread is being terminated, if any signal arrives for
 109  *    the task, or thread_abort_safely() is called on the thread.
 110  *
 111  *    Using this value means that you are willing to be interrupted in the face
 112  *    of any user signal, and safely rewind the thread back to the user/kernel
 113  *    boundary.  Many syscalls will try to restart the operation they were performing
 114  *    after the signal has been handled.
 115  *
 116  *    You must provide this value for any unbounded wait - otherwise you will
 117  *    pend user signals forever.
 118  *
 119  * Thread interrupt mask:
 120  *
 121  *   The current maximum interruptible state for the thread, as set by
 122  *   thread_interrupt_level(), will limit the conditions that will cause a wake.
 123  *   This is useful for code that can't be interrupted to set before calling code
 124  *   that doesn't know that.
 125  *
 126  * Thread termination vs safe abort:
 127  *
 128  *    Termination abort: thread_abort(), thread_terminate()
 129  *
 130  *    A termination abort is sticky.  Once a thread is marked for termination, every
 131  *    THREAD_INTERRUPTIBLE wait will return immediately with THREAD_INTERRUPTED
 132  *    until the thread successfully exits.
 133  *
 134  *    Safe abort: thread_abort_safely()
 135  *
 136  *    A safe abort is not sticky.  The current wait, (or the next wait if the thread
 137  *    is not currently waiting) will be interrupted, but then the abort condition is cleared.
 138  *    The next wait will sleep as normal. Safe aborts only have a single effect.
 139  *
 140  *    The path back to the user/kernel boundary must not make any further unbounded
 141  *    wait calls. The waiter should detect the THREAD_INTERRUPTED return code
 142  *    from an ABORTSAFE wait and return an error code that causes its caller
 143  *    to understand that the current operation has been interrupted, and its
 144  *    caller should return a similar error code, and so on until the
 145  *    user/kernel boundary is reached.  For Mach, the error code is usually KERN_ABORTED,
 146  *    for BSD it is EINTR.
 147  *
 148  *    Debuggers rely on the safe abort mechanism - a signaled thread must return to
 149  *    the AST at the user/kernel boundary for the debugger to finish attaching.
 150  *
 151  *    No wait/block will ever disappear a thread out from under the waiter. The block
 152  *    call will always either return or call the passed in continuation.
 153  */
 154 typedef int wait_interrupt_t;
 155 #define THREAD_UNINT                    0               /* not interruptible      */
 156 #define THREAD_INTERRUPTIBLE    1               /* may not be restartable */
 157 #define THREAD_ABORTSAFE                2               /* abortable safely       */
 158
 159 typedef int wait_timeout_urgency_t;
 160 #define TIMEOUT_URGENCY_SYS_NORMAL      0x00            /* use default leeway thresholds for system */
 161 #define TIMEOUT_URGENCY_SYS_CRITICAL    0x01            /* use critical leeway thresholds for system */
 162 #define TIMEOUT_URGENCY_SYS_BACKGROUND  0x02            /* use background leeway thresholds for system */
 163
 164 #define TIMEOUT_URGENCY_USER_MASK       0x10            /* mask to identify user timeout urgency classes */
 165 #define TIMEOUT_URGENCY_USER_NORMAL     0x10            /* use default leeway thresholds for user */
 166 #define TIMEOUT_URGENCY_USER_CRITICAL   0x11            /* use critical leeway thresholds for user */
 167 #define TIMEOUT_URGENCY_USER_BACKGROUND 0x12            /* use background leeway thresholds for user */
 168
 169 #define TIMEOUT_URGENCY_MASK            0x13            /* mask to identify timeout urgency */
 170
 171 #define TIMEOUT_URGENCY_LEEWAY          0x20            /* don't ignore provided leeway value */
 172
 173 #define TIMEOUT_URGENCY_FIRST_AVAIL     0x40            /* first available bit outside of urgency mask/leeway */
 174 #define TIMEOUT_URGENCY_RATELIMITED     0x80
 175
 176 /*
 177  * Timeout and deadline tokens for waits.
 178  * The following tokens define common values for leeway and deadline parameters.
 179  */
 180 #define TIMEOUT_NO_LEEWAY               (0ULL)
 181 #define TIMEOUT_WAIT_FOREVER            (0ULL)
 182
 183 #ifdef  KERNEL_PRIVATE
 184
 185 #ifdef  MACH_KERNEL_PRIVATE
 186
 187 #include <kern/misc_protos.h>
 188 typedef  struct clock                   *clock_t;
 189
 190 typedef struct mig_object               *mig_object_t;
 191 #define MIG_OBJECT_NULL                 ((mig_object_t) 0)
 192
 193 typedef struct mig_notify               *mig_notify_t;
 194 #define MIG_NOTIFY_NULL                 ((mig_notify_t) 0)
 195
 196 typedef struct pset_node                *pset_node_t;
 197 #define PSET_NODE_NULL                  ((pset_node_t) 0)
 198
 199 typedef struct affinity_set             *affinity_set_t;
 200 #define AFFINITY_SET_NULL               ((affinity_set_t) 0)
 201
 202 typedef struct run_queue               *run_queue_t;
 203 #define RUN_QUEUE_NULL                 ((run_queue_t) 0)
 204
 205 typedef struct grrr_run_queue               *grrr_run_queue_t;
 206 #define GRRR_RUN_QUEUE_NULL                 ((grrr_run_queue_t) 0)
 207
 208 typedef struct grrr_group                                       *grrr_group_t;
 209 #define GRRR_GROUP_NULL                                         ((grrr_group_t) 0)
 210
 211 #if defined(CONFIG_SCHED_MULTIQ)
 212 typedef struct sched_group              *sched_group_t;
 213 #define SCHED_GROUP_NULL                ((sched_group_t) 0)
 214 #endif /* defined(CONFIG_SCHED_MULTIQ) */
 215
 216 #else   /* MACH_KERNEL_PRIVATE */
 217
 218 struct wait_queue_set ;
 219 struct _wait_queue_link ;
 220
 221 #endif  /* MACH_KERNEL_PRIVATE */
 222
 223 typedef struct wait_queue_set   *wait_queue_set_t;
 224 #define WAIT_QUEUE_SET_NULL     ((wait_queue_set_t)0)
 225 #define SIZEOF_WAITQUEUE_SET    wait_queue_set_size()
 226
 227 typedef struct _wait_queue_link *wait_queue_link_t;
 228 #define WAIT_QUEUE_LINK_NULL    ((wait_queue_link_t)0)
 229 #define SIZEOF_WAITQUEUE_LINK   wait_queue_link_size()
 230
 231 typedef struct perfcontrol_state        *perfcontrol_state_t;
 232 #define PERFCONTROL_STATE_NULL          ((perfcontrol_state_t)0)
 233
 234 #endif  /* KERNEL_PRIVATE */
 235
 236 #endif  /* _KERN_KERN_TYPES_H_ */