The Tor Browser: nsprpub/pr/src/md/unix/pthreads

nsprpub/pr/src/md/unix/pthreads_user.c@6474c204b198 (annotated)

nsprpub/pr/src/md/unix/pthreads_user.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "primpl.h"
 #include <sys/types.h>
 #include <unistd.h>
 #include <signal.h>
 #include <pthread.h>
 sigset_t ints_off;
 pthread_mutex_t	_pr_heapLock;
 pthread_key_t current_thread_key;
 pthread_key_t current_cpu_key;
 pthread_key_t last_thread_key;
 pthread_key_t intsoff_key;
 PRInt32 _pr_md_pthreads_created, _pr_md_pthreads_failed;
 PRInt32 _pr_md_pthreads = 1;
 void _MD_EarlyInit(void)
 {
 extern PRInt32 _nspr_noclock;
 	if (pthread_key_create(&current_thread_key, NULL) != 0) {
 		perror("pthread_key_create failed");
 		exit(1);
 	}
 	if (pthread_key_create(&current_cpu_key, NULL) != 0) {
 		perror("pthread_key_create failed");
 		exit(1);
 	}
 	if (pthread_key_create(&last_thread_key, NULL) != 0) {
 		perror("pthread_key_create failed");
 		exit(1);
 	}
 	if (pthread_key_create(&intsoff_key, NULL) != 0) {
 		perror("pthread_key_create failed");
 		exit(1);
 	}
 	sigemptyset(&ints_off);
 	sigaddset(&ints_off, SIGALRM);
 	sigaddset(&ints_off, SIGIO);
 	sigaddset(&ints_off, SIGCLD);
 	/*
 	 * disable clock interrupts
 	 */
 	_nspr_noclock = 1;
 }
 void _MD_InitLocks()
 {
 	if (pthread_mutex_init(&_pr_heapLock, NULL) != 0) {
 		perror("pthread_mutex_init failed");
 		exit(1);
 	}
 }
 PR_IMPLEMENT(void) _MD_FREE_LOCK(struct _MDLock *lockp)
 {
 	PRIntn _is;
 	PRThread *me = _PR_MD_CURRENT_THREAD();
 	if (me && !_PR_IS_NATIVE_THREAD(me))
 		_PR_INTSOFF(_is);
 	pthread_mutex_destroy(&lockp->mutex);
 	if (me && !_PR_IS_NATIVE_THREAD(me))
 		_PR_FAST_INTSON(_is);
 }
 PR_IMPLEMENT(PRStatus) _MD_NEW_LOCK(struct _MDLock *lockp)
 {
     PRStatus rv;
     PRIntn is;
     PRThread *me = _PR_MD_CURRENT_THREAD();
 	if (me && !_PR_IS_NATIVE_THREAD(me))
 		_PR_INTSOFF(is);
 	rv = pthread_mutex_init(&lockp->mutex, NULL);
 	if (me && !_PR_IS_NATIVE_THREAD(me))
 		_PR_FAST_INTSON(is);
 	return (rv == 0) ? PR_SUCCESS : PR_FAILURE;
 }
 PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
 {
     if (isCurrent) {
 	(void) setjmp(CONTEXT(t));
     }
     *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
     return (PRWord *) CONTEXT(t);
 }
 PR_IMPLEMENT(void)
 _MD_SetPriority(_MDThread *thread, PRThreadPriority newPri)
 {
 	/*
 	 * XXX - to be implemented
 	 */
     return;
 }
 PR_IMPLEMENT(PRStatus) _MD_InitThread(struct PRThread *thread)
 {
     struct sigaction sigact;
     if (thread->flags & _PR_GLOBAL_SCOPE) {
         thread->md.pthread = pthread_self();
 #if 0
 		/*
 		 * set up SIGUSR1 handler; this is used to save state
 		 * during PR_SuspendAll
 		 */
 		sigact.sa_handler = save_context_and_block;
 		sigact.sa_flags = SA_RESTART;
 		/*
 		 * Must mask clock interrupts
 		 */
 		sigact.sa_mask = timer_set;
 		sigaction(SIGUSR1, &sigact, 0);
 #endif
     }
     return PR_SUCCESS;
 }
 PR_IMPLEMENT(void) _MD_ExitThread(struct PRThread *thread)
 {
     if (thread->flags & _PR_GLOBAL_SCOPE) {
         _MD_CLEAN_THREAD(thread);
         _MD_SET_CURRENT_THREAD(NULL);
     }
 }
 PR_IMPLEMENT(void) _MD_CleanThread(struct PRThread *thread)
 {
     if (thread->flags & _PR_GLOBAL_SCOPE) {
 		pthread_mutex_destroy(&thread->md.pthread_mutex);
 		pthread_cond_destroy(&thread->md.pthread_cond);
     }
 }
 PR_IMPLEMENT(void) _MD_SuspendThread(struct PRThread *thread)
 {
     PRInt32 rv;
     PR_ASSERT((thread->flags & _PR_GLOBAL_SCOPE) &&
         _PR_IS_GCABLE_THREAD(thread));
 #if 0
 	thread->md.suspending_id = getpid();
 	rv = kill(thread->md.id, SIGUSR1);
 	PR_ASSERT(rv == 0);
 	/*
 	 * now, block the current thread/cpu until woken up by the suspended
 	 * thread from it's SIGUSR1 signal handler
 	 */
 	blockproc(getpid());
 #endif
 }
 PR_IMPLEMENT(void) _MD_ResumeThread(struct PRThread *thread)
 {
     PRInt32 rv;
     PR_ASSERT((thread->flags & _PR_GLOBAL_SCOPE) &&
         _PR_IS_GCABLE_THREAD(thread));
 #if 0
     rv = unblockproc(thread->md.id);
 #endif
 }
 PR_IMPLEMENT(void) _MD_SuspendCPU(struct _PRCPU *thread)
 {
     PRInt32 rv;
 #if 0
 	cpu->md.suspending_id = getpid();
 	rv = kill(cpu->md.id, SIGUSR1);
 	PR_ASSERT(rv == 0);
 	/*
 	 * now, block the current thread/cpu until woken up by the suspended
 	 * thread from it's SIGUSR1 signal handler
 	 */
 	blockproc(getpid());
 #endif
 }
 PR_IMPLEMENT(void) _MD_ResumeCPU(struct _PRCPU *thread)
 {
 #if 0
 	unblockproc(cpu->md.id);
 #endif
 }
 #define PT_NANOPERMICRO 1000UL
 #define PT_BILLION 1000000000UL
 PR_IMPLEMENT(PRStatus)
 _pt_wait(PRThread *thread, PRIntervalTime timeout)
 {
 int rv;
 struct timeval now;
 struct timespec tmo;
 PRUint32 ticks = PR_TicksPerSecond();
 	if (timeout != PR_INTERVAL_NO_TIMEOUT) {
 		tmo.tv_sec = timeout / ticks;
 		tmo.tv_nsec = timeout - (tmo.tv_sec * ticks);
 		tmo.tv_nsec = PR_IntervalToMicroseconds(PT_NANOPERMICRO *
 											tmo.tv_nsec);
 		/* pthreads wants this in absolute time, off we go ... */
 		(void)GETTIMEOFDAY(&now);
 		/* that one's usecs, this one's nsecs - grrrr! */
 		tmo.tv_sec += now.tv_sec;
 		tmo.tv_nsec += (PT_NANOPERMICRO * now.tv_usec);
 		tmo.tv_sec += tmo.tv_nsec / PT_BILLION;
 		tmo.tv_nsec %= PT_BILLION;
 	}
 	pthread_mutex_lock(&thread->md.pthread_mutex);
 	thread->md.wait--;
 	if (thread->md.wait < 0) {
 		if (timeout != PR_INTERVAL_NO_TIMEOUT) {
 			rv = pthread_cond_timedwait(&thread->md.pthread_cond,
 					&thread->md.pthread_mutex, &tmo);
         }
 		else
 			rv = pthread_cond_wait(&thread->md.pthread_cond,
 					&thread->md.pthread_mutex);
 		if (rv != 0) {
 			thread->md.wait++;
 		}
 	} else
 		rv = 0;
 	pthread_mutex_unlock(&thread->md.pthread_mutex);
 	return (rv == 0) ? PR_SUCCESS : PR_FAILURE;
 }
 PR_IMPLEMENT(PRStatus)
 _MD_wait(PRThread *thread, PRIntervalTime ticks)
 {
     if ( thread->flags & _PR_GLOBAL_SCOPE ) {
 		_MD_CHECK_FOR_EXIT();
         if (_pt_wait(thread, ticks) == PR_FAILURE) {
 	    	_MD_CHECK_FOR_EXIT();
             /*
              * wait timed out
              */
             _PR_THREAD_LOCK(thread);
             if (thread->wait.cvar) {
                 /*
                  * The thread will remove itself from the waitQ
                  * of the cvar in _PR_WaitCondVar
                  */
                 thread->wait.cvar = NULL;
                 thread->state =  _PR_RUNNING;
                 _PR_THREAD_UNLOCK(thread);
             }  else {
         		_pt_wait(thread, PR_INTERVAL_NO_TIMEOUT);
                 _PR_THREAD_UNLOCK(thread);
             }
         }
     } else {
 		_PR_MD_SWITCH_CONTEXT(thread);
     }
     return PR_SUCCESS;
 }
 PR_IMPLEMENT(PRStatus)
 _MD_WakeupWaiter(PRThread *thread)
 {
     PRThread *me = _PR_MD_CURRENT_THREAD();
     PRInt32 pid, rv;
     PRIntn is;
 	PR_ASSERT(_pr_md_idle_cpus >= 0);
     if (thread == NULL) {
 		if (_pr_md_idle_cpus)
         	_MD_Wakeup_CPUs();
     } else if (!_PR_IS_NATIVE_THREAD(thread)) {
 		/*
 		 * If the thread is on my cpu's runq there is no need to
 		 * wakeup any cpus
 		 */
 		if (!_PR_IS_NATIVE_THREAD(me)) {
 			if (me->cpu != thread->cpu) {
 				if (_pr_md_idle_cpus)
         			_MD_Wakeup_CPUs();
 			}
 		} else {
 			if (_pr_md_idle_cpus)
         		_MD_Wakeup_CPUs();
 		}
     } else {
 		PR_ASSERT(_PR_IS_NATIVE_THREAD(thread));
 		if (!_PR_IS_NATIVE_THREAD(me))
 			_PR_INTSOFF(is);
 		pthread_mutex_lock(&thread->md.pthread_mutex);
 		thread->md.wait++;
 		rv = pthread_cond_signal(&thread->md.pthread_cond);
 		PR_ASSERT(rv == 0);
 		pthread_mutex_unlock(&thread->md.pthread_mutex);
 		if (!_PR_IS_NATIVE_THREAD(me))
 			_PR_FAST_INTSON(is);
     }
     return PR_SUCCESS;
 }
 /* These functions should not be called for AIX */
 PR_IMPLEMENT(void)
 _MD_YIELD(void)
 {
     PR_NOT_REACHED("_MD_YIELD should not be called for AIX.");
 }
 PR_IMPLEMENT(PRStatus)
 _MD_CreateThread(
     PRThread *thread,
     void (*start) (void *),
     PRThreadPriority priority,
     PRThreadScope scope,
     PRThreadState state,
     PRUint32 stackSize)
 {
     PRIntn is;
     int rv;
 	PRThread *me = _PR_MD_CURRENT_THREAD();
 	pthread_attr_t attr;
 	if (!_PR_IS_NATIVE_THREAD(me))
 		_PR_INTSOFF(is);
 	if (pthread_mutex_init(&thread->md.pthread_mutex, NULL) != 0) {
 		if (!_PR_IS_NATIVE_THREAD(me))
 			_PR_FAST_INTSON(is);
         return PR_FAILURE;
 	}
 	if (pthread_cond_init(&thread->md.pthread_cond, NULL) != 0) {
 		pthread_mutex_destroy(&thread->md.pthread_mutex);
 		if (!_PR_IS_NATIVE_THREAD(me))
 			_PR_FAST_INTSON(is);
         return PR_FAILURE;
 	}
     thread->flags |= _PR_GLOBAL_SCOPE;
 	pthread_attr_init(&attr); /* initialize attr with default attributes */
 	if (pthread_attr_setstacksize(&attr, (size_t) stackSize) != 0) {
 		pthread_mutex_destroy(&thread->md.pthread_mutex);
 		pthread_cond_destroy(&thread->md.pthread_cond);
 		pthread_attr_destroy(&attr);
 		if (!_PR_IS_NATIVE_THREAD(me))
 			_PR_FAST_INTSON(is);
         return PR_FAILURE;
 	}
 	thread->md.wait = 0;
     rv = pthread_create(&thread->md.pthread, &attr, start, (void *)thread);
     if (0 == rv) {
         _MD_ATOMIC_INCREMENT(&_pr_md_pthreads_created);
         _MD_ATOMIC_INCREMENT(&_pr_md_pthreads);
 		if (!_PR_IS_NATIVE_THREAD(me))
 			_PR_FAST_INTSON(is);
         return PR_SUCCESS;
     } else {
 		pthread_mutex_destroy(&thread->md.pthread_mutex);
 		pthread_cond_destroy(&thread->md.pthread_cond);
 		pthread_attr_destroy(&attr);
         _MD_ATOMIC_INCREMENT(&_pr_md_pthreads_failed);
 		if (!_PR_IS_NATIVE_THREAD(me))
 			_PR_FAST_INTSON(is);
         PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, rv);
         return PR_FAILURE;
     }
 }
 PR_IMPLEMENT(void)
 _MD_InitRunningCPU(struct _PRCPU *cpu)
 {
     extern int _pr_md_pipefd[2];
     _MD_unix_init_running_cpu(cpu);
     cpu->md.pthread = pthread_self();
 	if (_pr_md_pipefd[0] >= 0) {
     	_PR_IOQ_MAX_OSFD(cpu) = _pr_md_pipefd[0];
 #ifndef _PR_USE_POLL
     	FD_SET(_pr_md_pipefd[0], &_PR_FD_READ_SET(cpu));
 #endif
 	}
 }
 void
 _MD_CleanupBeforeExit(void)
 {
 #if 0
     extern PRInt32    _pr_cpus_exit;
 	_pr_irix_exit_now = 1;
     if (_pr_numCPU > 1) {
         /*
          * Set a global flag, and wakeup all cpus which will notice the flag
          * and exit.
          */
         _pr_cpus_exit = getpid();
         _MD_Wakeup_CPUs();
         while(_pr_numCPU > 1) {
             _PR_WAIT_SEM(_pr_irix_exit_sem);
             _pr_numCPU--;
         }
     }
     /*
      * cause global threads on the recycle list to exit
      */
      _PR_DEADQ_LOCK;
      if (_PR_NUM_DEADNATIVE != 0) {
 	PRThread *thread;
     	PRCList *ptr;
         ptr = _PR_DEADNATIVEQ.next;
         while( ptr != &_PR_DEADNATIVEQ ) {
         	thread = _PR_THREAD_PTR(ptr);
 		_MD_CVAR_POST_SEM(thread);
                 ptr = ptr->next;
         }
      }
      _PR_DEADQ_UNLOCK;
      while(_PR_NUM_DEADNATIVE > 1) {
 	_PR_WAIT_SEM(_pr_irix_exit_sem);
 	_PR_DEC_DEADNATIVE;
      }
 #endif
 }

The Tor Browser / annotate

nsprpub/pr/src/md/unix/pthreads_user.c@6474c204b198 (annotated)

nsprpub/pr/src/md/unix/pthreads_user.c