+++ /dev/null
-/*
- * Copyright 1996 1995 by Open Software Foundation, Inc. 1997 1996 1995 1994 1993 1992 1991
- * All Rights Reserved
- *
- * Permission to use, copy, modify, and distribute this software and
- * its documentation for any purpose and without fee is hereby granted,
- * provided that the above copyright notice appears in all copies and
- * that both the copyright notice and this permission notice appear in
- * supporting documentation.
- *
- * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
- * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE.
- *
- * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
- * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
- * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
- * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
- * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- */
-/*
- * MkLinux
- */
-
-/*
- * POSIX Pthread Library
- */
-
-#define __POSIX_LIB__
-#include <assert.h>
-#include <stdio.h> /* For printf(). */
-#include <stdlib.h>
-#include <errno.h> /* For __mach_errno_addr() prototype. */
-#include <sys/time.h>
-#include <sys/resource.h>
-#include <sys/sysctl.h>
-#include <machine/vmparam.h>
-#include <mach/vm_statistics.h>
-
-#include "pthread_internals.h"
-
-/* Per-thread kernel support */
-extern void _pthread_set_self(pthread_t);
-extern void mig_init(int);
-
-/* Needed to tell the malloc subsystem we're going multithreaded */
-extern void set_malloc_singlethreaded(int);
-
-/* Used when we need to call into the kernel with no reply port */
-extern pthread_lock_t reply_port_lock;
-
-/*
- * [Internal] stack support
- */
-
-size_t _pthread_stack_size = 0;
-int _spin_tries = 0;
-#if !defined(__ppc__)
-int _cpu_has_altivec = 0;
-#endif
-
-/* This global should be used (carefully) by anyone needing to know if a pthread has been
-** created.
-*/
-int __is_threaded = 0;
-
-/* These are used to keep track of a semaphore pool shared by mutexes and condition
-** variables.
-*/
-
-static semaphore_t *sem_pool = NULL;
-static int sem_pool_count = 0;
-static int sem_pool_current = 0;
-static pthread_lock_t sem_pool_lock = LOCK_INITIALIZER;
-
-static int default_priority;
-static int max_priority;
-static int min_priority;
-
-extern mach_port_t thread_recycle_port;
-
-#define STACK_LOWEST(sp) ((sp) & ~__pthread_stack_mask)
-#define STACK_RESERVED (sizeof (struct _pthread))
-
-#ifdef STACK_GROWS_UP
-
-/* The stack grows towards higher addresses:
- |struct _pthread|user stack---------------->|
- ^STACK_BASE ^STACK_START
- ^STACK_SELF
- ^STACK_LOWEST */
-#define STACK_BASE(sp) STACK_LOWEST(sp)
-#define STACK_START(stack_low) (STACK_BASE(stack_low) + STACK_RESERVED)
-#define STACK_SELF(sp) STACK_BASE(sp)
-
-#else
-
-/* The stack grows towards lower addresses:
- |<----------------user stack|struct _pthread|
- ^STACK_LOWEST ^STACK_START ^STACK_BASE
- ^STACK_SELF */
-
-#define STACK_BASE(sp) (((sp) | __pthread_stack_mask) + 1)
-#define STACK_START(stack_low) (STACK_BASE(stack_low) - STACK_RESERVED)
-#define STACK_SELF(sp) STACK_START(sp)
-
-#endif
-
-/* Set the base address to use as the stack pointer, before adjusting due to the ABI */
-
-static int
-_pthread_allocate_stack(pthread_attr_t *attrs, vm_address_t *stack)
-{
- kern_return_t kr;
-#if 1
- assert(attrs->stacksize >= PTHREAD_STACK_MIN);
- if (attrs->stackaddr != NULL) {
- assert(((vm_offset_t)(attrs->stackaddr) & (vm_page_size - 1)) == 0);
- *stack = (vm_address_t)attrs->stackaddr;
- return 0;
- }
- kr = vm_allocate(mach_task_self(), stack, attrs->stacksize + vm_page_size, VM_MAKE_TAG(VM_MEMORY_STACK)| TRUE);
- if (kr != KERN_SUCCESS) {
- return EAGAIN;
- }
-#ifdef STACK_GROWS_UP
- /* The guard page is the page one higher than the stack */
- /* The stack base is at the lowest address */
- kr = vm_protect(mach_task_self(), *stack + attrs->stacksize, vm_page_size, FALSE, VM_PROT_NONE);
-#else
- /* The guard page is at the lowest address */
- /* The stack base is the highest address */
- kr = vm_protect(mach_task_self(), *stack, vm_page_size, FALSE, VM_PROT_NONE);
- *stack += attrs->stacksize + vm_page_size;
-#endif
-
-#else
- vm_address_t cur_stack = (vm_address_t)0;
- if (free_stacks == 0)
- {
- /* Allocating guard pages is done by doubling
- * the actual stack size, since STACK_BASE() needs
- * to have stacks aligned on stack_size. Allocating just
- * one page takes as much memory as allocating more pages
- * since it will remain one entry in the vm map.
- * Besides, allocating more than one page allows tracking the
- * overflow pattern when the overflow is bigger than one page.
- */
-#ifndef NO_GUARD_PAGES
-# define GUARD_SIZE(a) (2*(a))
-# define GUARD_MASK(a) (((a)<<1) | 1)
-#else
-# define GUARD_SIZE(a) (a)
-# define GUARD_MASK(a) (a)
-#endif
- while (lowest_stack > GUARD_SIZE(__pthread_stack_size))
- {
- lowest_stack -= GUARD_SIZE(__pthread_stack_size);
- /* Ensure stack is there */
- kr = vm_allocate(mach_task_self(),
- &lowest_stack,
- GUARD_SIZE(__pthread_stack_size),
- FALSE);
-#ifndef NO_GUARD_PAGES
- if (kr == KERN_SUCCESS) {
-# ifdef STACK_GROWS_UP
- kr = vm_protect(mach_task_self(),
- lowest_stack+__pthread_stack_size,
- __pthread_stack_size,
- FALSE, VM_PROT_NONE);
-# else /* STACK_GROWS_UP */
- kr = vm_protect(mach_task_self(),
- lowest_stack,
- __pthread_stack_size,
- FALSE, VM_PROT_NONE);
- lowest_stack += __pthread_stack_size;
-# endif /* STACK_GROWS_UP */
- if (kr == KERN_SUCCESS)
- break;
- }
-#else
- if (kr == KERN_SUCCESS)
- break;
-#endif
- }
- if (lowest_stack > 0)
- free_stacks = (vm_address_t *)lowest_stack;
- else
- {
- /* Too bad. We'll just have to take what comes.
- Use vm_map instead of vm_allocate so we can
- specify alignment. */
- kr = vm_map(mach_task_self(), &lowest_stack,
- GUARD_SIZE(__pthread_stack_size),
- GUARD_MASK(__pthread_stack_mask),
- TRUE /* anywhere */, MEMORY_OBJECT_NULL,
- 0, FALSE, VM_PROT_DEFAULT, VM_PROT_ALL,
- VM_INHERIT_DEFAULT);
- /* This really shouldn't fail and if it does I don't
- know what to do. */
-#ifndef NO_GUARD_PAGES
- if (kr == KERN_SUCCESS) {
-# ifdef STACK_GROWS_UP
- kr = vm_protect(mach_task_self(),
- lowest_stack+__pthread_stack_size,
- __pthread_stack_size,
- FALSE, VM_PROT_NONE);
-# else /* STACK_GROWS_UP */
- kr = vm_protect(mach_task_self(),
- lowest_stack,
- __pthread_stack_size,
- FALSE, VM_PROT_NONE);
- lowest_stack += __pthread_stack_size;
-# endif /* STACK_GROWS_UP */
- }
-#endif
- free_stacks = (vm_address_t *)lowest_stack;
- lowest_stack = 0;
- }
- *free_stacks = 0; /* No other free stacks */
- }
- cur_stack = STACK_START((vm_address_t) free_stacks);
- free_stacks = (vm_address_t *)*free_stacks;
- cur_stack = _adjust_sp(cur_stack); /* Machine dependent stack fudging */
-#endif
- return 0;
-}
-
-/*
- * Destroy a thread attribute structure
- */
-int
-pthread_attr_destroy(pthread_attr_t *attr)
-{
- if (attr->sig == _PTHREAD_ATTR_SIG)
- {
- return (ESUCCESS);
- } else
- {
- return (EINVAL); /* Not an attribute structure! */
- }
-}
-
-/*
- * Get the 'detach' state from a thread attribute structure.
- * Note: written as a helper function for info hiding
- */
-int
-pthread_attr_getdetachstate(const pthread_attr_t *attr,
- int *detachstate)
-{
- if (attr->sig == _PTHREAD_ATTR_SIG)
- {
- *detachstate = attr->detached;
- return (ESUCCESS);
- } else
- {
- return (EINVAL); /* Not an attribute structure! */
- }
-}
-
-/*
- * Get the 'inherit scheduling' info from a thread attribute structure.
- * Note: written as a helper function for info hiding
- */
-int
-pthread_attr_getinheritsched(const pthread_attr_t *attr,
- int *inheritsched)
-{
- if (attr->sig == _PTHREAD_ATTR_SIG)
- {
- *inheritsched = attr->inherit;
- return (ESUCCESS);
- } else
- {
- return (EINVAL); /* Not an attribute structure! */
- }
-}
-
-/*
- * Get the scheduling parameters from a thread attribute structure.
- * Note: written as a helper function for info hiding
- */
-int
-pthread_attr_getschedparam(const pthread_attr_t *attr,
- struct sched_param *param)
-{
- if (attr->sig == _PTHREAD_ATTR_SIG)
- {
- *param = attr->param;
- return (ESUCCESS);
- } else
- {
- return (EINVAL); /* Not an attribute structure! */
- }
-}
-
-/*
- * Get the scheduling policy from a thread attribute structure.
- * Note: written as a helper function for info hiding
- */
-int
-pthread_attr_getschedpolicy(const pthread_attr_t *attr,
- int *policy)
-{
- if (attr->sig == _PTHREAD_ATTR_SIG)
- {
- *policy = attr->policy;
- return (ESUCCESS);
- } else
- {
- return (EINVAL); /* Not an attribute structure! */
- }
-}
-
-static const size_t DEFAULT_STACK_SIZE = DFLSSIZ;
-/*
- * Initialize a thread attribute structure to default values.
- */
-int
-pthread_attr_init(pthread_attr_t *attr)
-{
- attr->stacksize = DEFAULT_STACK_SIZE;
- attr->stackaddr = NULL;
- attr->sig = _PTHREAD_ATTR_SIG;
- attr->policy = _PTHREAD_DEFAULT_POLICY;
- attr->param.sched_priority = default_priority;
- attr->param.quantum = 10; /* quantum isn't public yet */
- attr->inherit = _PTHREAD_DEFAULT_INHERITSCHED;
- attr->detached = PTHREAD_CREATE_JOINABLE;
- attr->freeStackOnExit = TRUE;
- return (ESUCCESS);
-}
-
-/*
- * Set the 'detach' state in a thread attribute structure.
- * Note: written as a helper function for info hiding
- */
-int
-pthread_attr_setdetachstate(pthread_attr_t *attr,
- int detachstate)
-{
- if (attr->sig == _PTHREAD_ATTR_SIG)
- {
- if ((detachstate == PTHREAD_CREATE_JOINABLE) ||
- (detachstate == PTHREAD_CREATE_DETACHED))
- {
- attr->detached = detachstate;
- return (ESUCCESS);
- } else
- {
- return (EINVAL);
- }
- } else
- {
- return (EINVAL); /* Not an attribute structure! */
- }
-}
-
-/*
- * Set the 'inherit scheduling' state in a thread attribute structure.
- * Note: written as a helper function for info hiding
- */
-int
-pthread_attr_setinheritsched(pthread_attr_t *attr,
- int inheritsched)
-{
- if (attr->sig == _PTHREAD_ATTR_SIG)
- {
- if ((inheritsched == PTHREAD_INHERIT_SCHED) ||
- (inheritsched == PTHREAD_EXPLICIT_SCHED))
- {
- attr->inherit = inheritsched;
- return (ESUCCESS);
- } else
- {
- return (EINVAL);
- }
- } else
- {
- return (EINVAL); /* Not an attribute structure! */
- }
-}
-
-/*
- * Set the scheduling paramters in a thread attribute structure.
- * Note: written as a helper function for info hiding
- */
-int
-pthread_attr_setschedparam(pthread_attr_t *attr,
- const struct sched_param *param)
-{
- if (attr->sig == _PTHREAD_ATTR_SIG)
- {
- /* TODO: Validate sched_param fields */
- attr->param = *param;
- return (ESUCCESS);
- } else
- {
- return (EINVAL); /* Not an attribute structure! */
- }
-}
-
-/*
- * Set the scheduling policy in a thread attribute structure.
- * Note: written as a helper function for info hiding
- */
-int
-pthread_attr_setschedpolicy(pthread_attr_t *attr,
- int policy)
-{
- if (attr->sig == _PTHREAD_ATTR_SIG)
- {
- if ((policy == SCHED_OTHER) ||
- (policy == SCHED_RR) ||
- (policy == SCHED_FIFO))
- {
- attr->policy = policy;
- return (ESUCCESS);
- } else
- {
- return (EINVAL);
- }
- } else
- {
- return (EINVAL); /* Not an attribute structure! */
- }
-}
-
-/*
- * Set the scope for the thread.
- * We currently only provide PTHREAD_SCOPE_SYSTEM
- */
-int
-pthread_attr_setscope(pthread_attr_t *attr,
- int scope)
-{
- if (attr->sig == _PTHREAD_ATTR_SIG) {
- if (scope == PTHREAD_SCOPE_SYSTEM) {
- /* No attribute yet for the scope */
- return (ESUCCESS);
- } else if (scope == PTHREAD_SCOPE_PROCESS) {
- return (ENOTSUP);
- }
- }
- return (EINVAL); /* Not an attribute structure! */
-}
-
-/*
- * Get the scope for the thread.
- * We currently only provide PTHREAD_SCOPE_SYSTEM
- */
-int
-pthread_attr_getscope(pthread_attr_t *attr,
- int *scope)
-{
- if (attr->sig == _PTHREAD_ATTR_SIG) {
- *scope = PTHREAD_SCOPE_SYSTEM;
- return (ESUCCESS);
- }
- return (EINVAL); /* Not an attribute structure! */
-}
-
-/* Get the base stack address of the given thread */
-int
-pthread_attr_getstackaddr(const pthread_attr_t *attr, void **stackaddr)
-{
- if (attr->sig == _PTHREAD_ATTR_SIG) {
- *stackaddr = attr->stackaddr;
- return (ESUCCESS);
- } else {
- return (EINVAL); /* Not an attribute structure! */
- }
-}
-
-int
-pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr)
-{
- if ((attr->sig == _PTHREAD_ATTR_SIG) && (((vm_offset_t)stackaddr & (vm_page_size - 1)) == 0)) {
- attr->stackaddr = stackaddr;
- attr->freeStackOnExit = FALSE;
- return (ESUCCESS);
- } else {
- return (EINVAL); /* Not an attribute structure! */
- }
-}
-
-int
-pthread_attr_getstacksize(const pthread_attr_t *attr, size_t *stacksize)
-{
- if (attr->sig == _PTHREAD_ATTR_SIG) {
- *stacksize = attr->stacksize;
- return (ESUCCESS);
- } else {
- return (EINVAL); /* Not an attribute structure! */
- }
-}
-
-int
-pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize)
-{
- if ((attr->sig == _PTHREAD_ATTR_SIG) && ((stacksize % vm_page_size) == 0) && (stacksize >= PTHREAD_STACK_MIN)) {
- attr->stacksize = stacksize;
- return (ESUCCESS);
- } else {
- return (EINVAL); /* Not an attribute structure! */
- }
-}
-
-/*
- * Create and start execution of a new thread.
- */
-
-static void
-_pthread_body(pthread_t self)
-{
- _pthread_set_self(self);
- pthread_exit((self->fun)(self->arg));
-}
-
-int
-_pthread_create(pthread_t t,
- const pthread_attr_t *attrs,
- vm_address_t stack,
- const mach_port_t kernel_thread)
-{
- int res;
- kern_return_t kern_res;
- res = ESUCCESS;
- do
- {
- memset(t, 0, sizeof(*t));
- t->stacksize = attrs->stacksize;
- t->stackaddr = (void *)stack;
- t->kernel_thread = kernel_thread;
- t->detached = attrs->detached;
- t->inherit = attrs->inherit;
- t->policy = attrs->policy;
- t->param = attrs->param;
- t->freeStackOnExit = attrs->freeStackOnExit;
- t->mutexes = (struct _pthread_mutex *)NULL;
- t->sig = _PTHREAD_SIG;
- t->reply_port = MACH_PORT_NULL;
- t->cthread_self = NULL;
- LOCK_INIT(t->lock);
- t->cancel_state = PTHREAD_CANCEL_ENABLE | PTHREAD_CANCEL_DEFERRED;
- t->cleanup_stack = (struct _pthread_handler_rec *)NULL;
- pthread_setschedparam(t, t->policy, &t->param);
- /* Create control semaphores */
- if (t->detached == PTHREAD_CREATE_JOINABLE)
- {
- PTHREAD_MACH_CALL(semaphore_create(mach_task_self(),
- &t->death,
- SYNC_POLICY_FIFO,
- 0), kern_res);
- if (kern_res != KERN_SUCCESS)
- {
- printf("Can't create 'death' semaphore: %d\n", kern_res);
- res = EINVAL; /* Need better error here? */
- break;
- }
- PTHREAD_MACH_CALL(semaphore_create(mach_task_self(),
- &t->joiners,
- SYNC_POLICY_FIFO,
- 0), kern_res);
- if (kern_res != KERN_SUCCESS)
- {
- printf("Can't create 'joiners' semaphore: %d\n", kern_res);
- res = EINVAL; /* Need better error here? */
- break;
- }
- t->num_joiners = 0;
- } else
- {
- t->death = MACH_PORT_NULL;
- }
- } while (0);
- return (res);
-}
-
-int
-_pthread_is_threaded(void)
-{
- return __is_threaded;
-}
-
-mach_port_t
-pthread_mach_thread_np(pthread_t t)
-{
- return t->kernel_thread;
-}
-
-size_t
-pthread_get_stacksize_np(pthread_t t)
-{
- return t->stacksize;
-}
-
-void *
-pthread_get_stackaddr_np(pthread_t t)
-{
- return t->stackaddr;
-}
-
-mach_port_t
-_pthread_reply_port(pthread_t t)
-{
- return t->reply_port;
-}
-
-static int
-_pthread_create_suspended(pthread_t *thread,
- const pthread_attr_t *attr,
- void *(*start_routine)(void *),
- void *arg,
- int suspended)
-{
- pthread_attr_t _attr, *attrs;
- vm_address_t stack;
- int res;
- pthread_t t;
- kern_return_t kern_res;
- mach_port_t kernel_thread;
- if ((attrs = (pthread_attr_t *)attr) == (pthread_attr_t *)NULL)
- { /* Set up default paramters */
- attrs = &_attr;
- pthread_attr_init(attrs);
- } else if (attrs->sig != _PTHREAD_ATTR_SIG) {
- return EINVAL;
- }
- res = ESUCCESS;
- do
- {
- /* Allocate a stack for the thread */
- if ((res = _pthread_allocate_stack(attrs, &stack)) != 0) {
- break;
- }
- t = (pthread_t)malloc(sizeof(struct _pthread));
- *thread = t;
- /* Create the Mach thread for this thread */
- PTHREAD_MACH_CALL(thread_create(mach_task_self(), &kernel_thread), kern_res);
- if (kern_res != KERN_SUCCESS)
- {
- printf("Can't create thread: %d\n", kern_res);
- res = EINVAL; /* Need better error here? */
- break;
- }
- if ((res = _pthread_create(t, attrs, stack, kernel_thread)) != 0)
- {
- break;
- }
- t->arg = arg;
- t->fun = start_routine;
- /* Now set it up to execute */
- _pthread_setup(t, _pthread_body, stack);
- /* Send it on it's way */
- set_malloc_singlethreaded(0);
- __is_threaded = 1;
- if (suspended == 0) {
- PTHREAD_MACH_CALL(thread_resume(kernel_thread), kern_res);
- }
- if (kern_res != KERN_SUCCESS)
- {
- printf("Can't resume thread: %d\n", kern_res);
- res = EINVAL; /* Need better error here? */
- break;
- }
- } while (0);
- return (res);
-}
-
-int
-pthread_create(pthread_t *thread,
- const pthread_attr_t *attr,
- void *(*start_routine)(void *),
- void *arg)
-{
- return _pthread_create_suspended(thread, attr, start_routine, arg, 0);
-}
-
-int
-pthread_create_suspended_np(pthread_t *thread,
- const pthread_attr_t *attr,
- void *(*start_routine)(void *),
- void *arg)
-{
- return _pthread_create_suspended(thread, attr, start_routine, arg, 1);
-}
-
-/*
- * Make a thread 'undetached' - no longer 'joinable' with other threads.
- */
-int
-pthread_detach(pthread_t thread)
-{
- kern_return_t kern_res;
- int num_joiners;
- mach_port_t death;
- if (thread->sig == _PTHREAD_SIG)
- {
- LOCK(thread->lock);
- if (thread->detached == PTHREAD_CREATE_JOINABLE)
- {
- thread->detached = PTHREAD_CREATE_DETACHED;
- num_joiners = thread->num_joiners;
- death = thread->death;
- thread->death = MACH_PORT_NULL;
- UNLOCK(thread->lock);
- if (num_joiners > 0)
- {
- /* Wake up a joiner */
- PTHREAD_MACH_CALL(semaphore_signal(thread->joiners), kern_res);
- }
- /* Destroy 'control' semaphores */
- PTHREAD_MACH_CALL(semaphore_destroy(mach_task_self(),
- thread->joiners), kern_res);
- PTHREAD_MACH_CALL(semaphore_destroy(mach_task_self(),
- death), kern_res);
- return (ESUCCESS);
- } else if (thread->detached == _PTHREAD_EXITED) {
- UNLOCK(thread->lock);
- pthread_join(thread, NULL);
- return ESUCCESS;
- } else
- {
- UNLOCK(thread->lock);
- return (EINVAL);
- }
- } else
- {
- return (ESRCH); /* Not a valid thread */
- }
-}
-
-/* Announce that there is a thread ready to be reclaimed for pthread_create */
-/* or terminated by pthread_exit. If the thread is reused, it will have its */
-/* thread state set and will continue in the thread body function. If it is */
-/* terminated, it will be yanked out from under the mach_msg() call. */
-
-static void _pthread_become_available(pthread_t thread) {
- mach_msg_empty_rcv_t msg = { { 0 } };
- kern_return_t ret;
-
- if (thread->reply_port == MACH_PORT_NULL) {
- thread->reply_port = mach_reply_port();
- }
- msg.header.msgh_size = sizeof msg - sizeof msg.trailer;
- msg.header.msgh_remote_port = thread_recycle_port;
- msg.header.msgh_local_port = MACH_PORT_NULL;
- msg.header.msgh_id = (int)thread;
- msg.header.msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, 0);
- ret = mach_msg(&msg.header, MACH_SEND_MSG | MACH_RCV_MSG,
- msg.header.msgh_size, sizeof msg,
- thread->reply_port, MACH_MSG_TIMEOUT_NONE,
- MACH_PORT_NULL);
- while (1) {
- ret = thread_suspend(thread->kernel_thread);
- }
- /* We should never get here */
-}
-
-/* Check to see if any threads are available. Return immediately */
-
-static kern_return_t _pthread_check_for_available_threads(mach_msg_empty_rcv_t *msg) {
- return mach_msg(&msg->header, MACH_RCV_MSG|MACH_RCV_TIMEOUT, 0,
- sizeof(mach_msg_empty_rcv_t), thread_recycle_port, 0,
- MACH_PORT_NULL);
-}
-
-/* Terminate all available threads and deallocate their stacks */
-static void _pthread_reap_threads(void) {
- kern_return_t ret;
- mach_msg_empty_rcv_t msg = { { 0 } };
- while((ret = _pthread_check_for_available_threads(&msg)) == KERN_SUCCESS) {
- pthread_t th = (pthread_t)msg.header.msgh_id;
- mach_port_t kernel_thread = th->kernel_thread;
- mach_port_t reply_port = th->reply_port;
- vm_size_t size = (vm_size_t)th->stacksize + vm_page_size;
- vm_address_t addr = (vm_address_t)th->stackaddr;
-#if !defined(STACK_GROWS_UP)
- addr -= size;
-#endif
- ret = thread_terminate(kernel_thread);
- if (ret != KERN_SUCCESS) {
- fprintf(stderr, "thread_terminate() failed: %s\n",
- mach_error_string(ret));
- }
- ret = mach_port_destroy(mach_task_self(), reply_port);
- if (ret != KERN_SUCCESS) {
- fprintf(stderr,
- "mach_port_destroy(thread_reply) failed: %s\n",
- mach_error_string(ret));
- }
- if (th->freeStackOnExit) {
- ret = vm_deallocate(mach_task_self(), addr, size);
- if (ret != KERN_SUCCESS) {
- fprintf(stderr,
- "vm_deallocate(stack) failed: %s\n",
- mach_error_string(ret));
- }
- }
- free(th);
- }
- assert(ret == MACH_RCV_TIMED_OUT);
-}
-
-/* For compatibility... */
-
-pthread_t
-_pthread_self() {
- return pthread_self();
-}
-
-/*
- * Terminate a thread.
- */
-void
-pthread_exit(void *value_ptr)
-{
- pthread_t self = pthread_self();
- struct _pthread_handler_rec *handler;
- kern_return_t kern_res;
- int num_joiners;
- while ((handler = self->cleanup_stack) != 0)
- {
- (handler->routine)(handler->arg);
- self->cleanup_stack = handler->next;
- }
- _pthread_tsd_cleanup(self);
- LOCK(self->lock);
- if (self->detached == PTHREAD_CREATE_JOINABLE)
- {
- self->detached = _PTHREAD_EXITED;
- self->exit_value = value_ptr;
- num_joiners = self->num_joiners;
- UNLOCK(self->lock);
- if (num_joiners > 0)
- {
- /* POSIX says that multiple pthread_join() calls on */
- /* the same thread are undefined so we just wake up */
- /* the first one to join */
- PTHREAD_MACH_CALL(semaphore_signal(self->joiners), kern_res);
- }
- do {
- PTHREAD_MACH_CALL(semaphore_wait(self->death), kern_res);
- } while (kern_res == KERN_ABORTED);
- } else
- UNLOCK(self->lock);
- /* Destroy thread & reclaim resources */
- if (self->death)
- {
- PTHREAD_MACH_CALL(semaphore_destroy(mach_task_self(), self->joiners), kern_res);
- PTHREAD_MACH_CALL(semaphore_destroy(mach_task_self(), self->death), kern_res);
- }
- if (self->detached == _PTHREAD_CREATE_PARENT) {
- exit((int)(self->exit_value));
- }
-
- _pthread_reap_threads();
-
- _pthread_become_available(self);
-}
-
-/*
- * Wait for a thread to terminate and obtain its exit value.
- */
-int
-pthread_join(pthread_t thread,
- void **value_ptr)
-{
- kern_return_t kern_res;
- if (thread->sig == _PTHREAD_SIG)
- {
- LOCK(thread->lock);
- if (thread->detached == PTHREAD_CREATE_JOINABLE)
- {
- thread->num_joiners++;
- UNLOCK(thread->lock);
- do {
- PTHREAD_MACH_CALL(semaphore_wait(thread->joiners), kern_res);
- } while (kern_res == KERN_ABORTED);
- LOCK(thread->lock);
- thread->num_joiners--;
- }
- if (thread->detached == _PTHREAD_EXITED)
- {
- if (thread->num_joiners == 0)
- { /* Give the result to this thread */
- if (value_ptr)
- {
- *value_ptr = thread->exit_value;
- }
- UNLOCK(thread->lock);
- PTHREAD_MACH_CALL(semaphore_signal(thread->death), kern_res);
- return (ESUCCESS);
- } else
- { /* This 'joiner' missed the catch! */
- UNLOCK(thread->lock);
- return (ESRCH);
- }
- } else
- { /* The thread has become anti-social! */
- UNLOCK(thread->lock);
- return (EINVAL);
- }
- } else
- {
- return (ESRCH); /* Not a valid thread */
- }
-}
-
-/*
- * Get the scheduling policy and scheduling paramters for a thread.
- */
-int
-pthread_getschedparam(pthread_t thread,
- int *policy,
- struct sched_param *param)
-{
- if (thread->sig == _PTHREAD_SIG)
- {
- *policy = thread->policy;
- *param = thread->param;
- return (ESUCCESS);
- } else
- {
- return (ESRCH); /* Not a valid thread structure */
- }
-}
-
-/*
- * Set the scheduling policy and scheduling paramters for a thread.
- */
-int
-pthread_setschedparam(pthread_t thread,
- int policy,
- const struct sched_param *param)
-{
- policy_base_data_t bases;
- policy_base_t base;
- mach_msg_type_number_t count;
- kern_return_t ret;
-
- if (thread->sig == _PTHREAD_SIG)
- {
- switch (policy)
- {
- case SCHED_OTHER:
- bases.ts.base_priority = param->sched_priority;
- base = (policy_base_t)&bases.ts;
- count = POLICY_TIMESHARE_BASE_COUNT;
- break;
- case SCHED_FIFO:
- bases.fifo.base_priority = param->sched_priority;
- base = (policy_base_t)&bases.fifo;
- count = POLICY_FIFO_BASE_COUNT;
- break;
- case SCHED_RR:
- bases.rr.base_priority = param->sched_priority;
- /* quantum isn't public yet */
- bases.rr.quantum = param->quantum;
- base = (policy_base_t)&bases.rr;
- count = POLICY_RR_BASE_COUNT;
- break;
- default:
- return (EINVAL);
- }
- thread->policy = policy;
- thread->param = *param;
- ret = thread_policy(thread->kernel_thread, policy, base, count, TRUE);
- if (ret != KERN_SUCCESS)
- {
- return (EINVAL);
- }
- return (ESUCCESS);
- } else
- {
- return (ESRCH); /* Not a valid thread structure */
- }
-}
-
-/*
- * Get the minimum priority for the given policy
- */
-int
-sched_get_priority_min(int policy)
-{
- return default_priority - 16;
-}
-
-/*
- * Get the maximum priority for the given policy
- */
-int
-sched_get_priority_max(int policy)
-{
- return default_priority + 16;
-}
-
-/*
- * Determine if two thread identifiers represent the same thread.
- */
-int
-pthread_equal(pthread_t t1,
- pthread_t t2)
-{
- return (t1 == t2);
-}
-
-void
-cthread_set_self(void *cself)
-{
- pthread_t self = pthread_self();
- if ((self == (pthread_t)NULL) || (self->sig != _PTHREAD_SIG)) {
- _pthread_set_self(cself);
- return;
- }
- self->cthread_self = cself;
-}
-
-void *
-ur_cthread_self(void) {
- pthread_t self = pthread_self();
- if ((self == (pthread_t)NULL) || (self->sig != _PTHREAD_SIG)) {
- return (void *)self;
- }
- return self->cthread_self;
-}
-
-/*
- * Execute a function exactly one time in a thread-safe fashion.
- */
-int
-pthread_once(pthread_once_t *once_control,
- void (*init_routine)(void))
-{
- LOCK(once_control->lock);
- if (once_control->sig == _PTHREAD_ONCE_SIG_init)
- {
- (*init_routine)();
- once_control->sig = _PTHREAD_ONCE_SIG;
- }
- UNLOCK(once_control->lock);
- return (ESUCCESS); /* Spec defines no possible errors! */
-}
-
-/*
- * Cancel a thread
- */
-int
-pthread_cancel(pthread_t thread)
-{
- if (thread->sig == _PTHREAD_SIG)
- {
- thread->cancel_state |= _PTHREAD_CANCEL_PENDING;
- return (ESUCCESS);
- } else
- {
- return (ESRCH);
- }
-}
-
-/*
- * Insert a cancellation point in a thread.
- */
-static void
-_pthread_testcancel(pthread_t thread)
-{
- LOCK(thread->lock);
- if ((thread->cancel_state & (PTHREAD_CANCEL_ENABLE|_PTHREAD_CANCEL_PENDING)) ==
- (PTHREAD_CANCEL_ENABLE|_PTHREAD_CANCEL_PENDING))
- {
- UNLOCK(thread->lock);
- pthread_exit(0);
- }
- UNLOCK(thread->lock);
-}
-
-void
-pthread_testcancel(void)
-{
- pthread_t self = pthread_self();
- _pthread_testcancel(self);
-}
-
-/*
- * Query/update the cancelability 'state' of a thread
- */
-int
-pthread_setcancelstate(int state, int *oldstate)
-{
- pthread_t self = pthread_self();
- int err = ESUCCESS;
- LOCK(self->lock);
- *oldstate = self->cancel_state & _PTHREAD_CANCEL_STATE_MASK;
- if ((state == PTHREAD_CANCEL_ENABLE) || (state == PTHREAD_CANCEL_DISABLE))
- {
- self->cancel_state = (self->cancel_state & _PTHREAD_CANCEL_STATE_MASK) | state;
- } else
- {
- err = EINVAL;
- }
- UNLOCK(self->lock);
- _pthread_testcancel(self); /* See if we need to 'die' now... */
- return (err);
-}
-
-/*
- * Query/update the cancelability 'type' of a thread
- */
-int
-pthread_setcanceltype(int type, int *oldtype)
-{
- pthread_t self = pthread_self();
- int err = ESUCCESS;
- LOCK(self->lock);
- *oldtype = self->cancel_state & _PTHREAD_CANCEL_TYPE_MASK;
- if ((type == PTHREAD_CANCEL_DEFERRED) || (type == PTHREAD_CANCEL_ASYNCHRONOUS))
- {
- self->cancel_state = (self->cancel_state & _PTHREAD_CANCEL_TYPE_MASK) | type;
- } else
- {
- err = EINVAL;
- }
- UNLOCK(self->lock);
- _pthread_testcancel(self); /* See if we need to 'die' now... */
- return (err);
-}
-
-/*
- * Perform package initialization - called automatically when application starts
- */
-
-/* We'll implement this when the main thread is a pthread */
-/* Use the local _pthread struct to avoid malloc before our MiG reply port is set */
-
-static struct _pthread _thread = {0};
-
-static int
-pthread_init(void)
-{
- pthread_attr_t _attr, *attrs;
- pthread_t thread;
- kern_return_t kr;
- host_basic_info_data_t basic_info;
- host_priority_info_data_t priority_info;
- host_info_t info;
- host_flavor_t flavor;
- mach_msg_type_number_t count;
- int mib[2];
- size_t len;
- int hasvectorunit, numcpus;
-
- count = HOST_PRIORITY_INFO_COUNT;
- info = (host_info_t)&priority_info;
- flavor = HOST_PRIORITY_INFO;
- kr = host_info(mach_host_self(), flavor, info, &count);
- if (kr != KERN_SUCCESS)
- printf("host_info failed (%d); probably need privilege.\n", kr);
- else {
- default_priority = priority_info.user_priority;
- min_priority = priority_info.minimum_priority;
- max_priority = priority_info.maximum_priority;
- }
- attrs = &_attr;
- pthread_attr_init(attrs);
- _pthread_set_self(&_thread);
-
- _pthread_create(&_thread, attrs, USRSTACK, mach_thread_self());
- thread = &_thread;
- thread->detached = _PTHREAD_CREATE_PARENT;
-
- /* See if we're on a multiprocessor and set _spin_tries if so. */
- mib[0] = CTL_HW;
- mib[1] = HW_NCPU;
- len = sizeof(numcpus);
- if (sysctl(mib, 2, &numcpus, &len, NULL, 0) == 0) {
- if (numcpus > 1) {
- _spin_tries = MP_SPIN_TRIES;
- }
- } else {
- count = HOST_BASIC_INFO_COUNT;
- info = (host_info_t)&basic_info;
- flavor = HOST_BASIC_INFO;
- kr = host_info(mach_host_self(), flavor, info, &count);
- if (kr != KERN_SUCCESS)
- printf("host_info failed (%d)\n", kr);
- else {
- if (basic_info.avail_cpus > 1)
- _spin_tries = MP_SPIN_TRIES;
- /* This is a crude test */
- if (basic_info.cpu_subtype >= CPU_SUBTYPE_POWERPC_7400)
- _cpu_has_altivec = 1;
- }
- }
- mib[0] = CTL_HW;
- mib[1] = HW_VECTORUNIT;
- len = sizeof(hasvectorunit);
- if (sysctl(mib, 2, &hasvectorunit, &len, NULL, 0) == 0) {
- _cpu_has_altivec = hasvectorunit;
- }
- mig_init(1); /* enable multi-threaded mig interfaces */
- return 0;
-}
-
-int sched_yield(void)
-{
- swtch_pri(0);
- return 0;
-}
-
-/* This is the "magic" that gets the initialization routine called when the application starts */
-int (*_cthread_init_routine)(void) = pthread_init;
-
-/* Get a semaphore from the pool, growing it if necessary */
-
-__private_extern__ semaphore_t new_sem_from_pool(void) {
- kern_return_t res;
- semaphore_t sem;
- int i;
-
- LOCK(sem_pool_lock);
- if (sem_pool_current == sem_pool_count) {
- sem_pool_count += 16;
- sem_pool = realloc(sem_pool, sem_pool_count * sizeof(semaphore_t));
- for (i = sem_pool_current; i < sem_pool_count; i++) {
- PTHREAD_MACH_CALL(semaphore_create(mach_task_self(), &sem_pool[i], SYNC_POLICY_FIFO, 0), res);
- }
- }
- sem = sem_pool[sem_pool_current++];
- UNLOCK(sem_pool_lock);
- return sem;
-}
-
-/* Put a semaphore back into the pool */
-__private_extern__ void restore_sem_to_pool(semaphore_t sem) {
- LOCK(sem_pool_lock);
- sem_pool[--sem_pool_current] = sem;
- UNLOCK(sem_pool_lock);
-}
-
-static void sem_pool_reset(void) {
- LOCK(sem_pool_lock);
- sem_pool_count = 0;
- sem_pool_current = 0;
- sem_pool = NULL;
- UNLOCK(sem_pool_lock);
-}
-
-__private_extern__ void _pthread_fork_child(void) {
- /* Just in case somebody had it locked... */
- UNLOCK(sem_pool_lock);
- sem_pool_reset();
-}
-
projects / apple / libc.git / blobdiff