The Tor Browser: nsprpub/pr/src/bthreads/btlocks.c@6474c204b198

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

     1 /* -*- Mode: C++; c-basic-offset: 4 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 /*

     7 ** File:        btlocks.c

     8 ** Description: Implemenation for thread locks using bthreads

     9 ** Exports:     prlock.h

    10 */

    12 #include "primpl.h"

    14 #include <string.h>

    15 #include <sys/time.h>

    17 void

    18 _PR_InitLocks (void)

    19 {

    20 }

    22 PR_IMPLEMENT(PRLock*)

    23     PR_NewLock (void)

    24 {

    25     PRLock *lock;

    26     status_t semresult;

    28     if (!_pr_initialized) _PR_ImplicitInitialization();

    30     lock = PR_NEWZAP(PRLock);

    31     if (lock != NULL) {

    33 	lock->benaphoreCount = 0;

    34 	lock->semaphoreID = create_sem( 0, "nsprLockSem" );

    35 	if( lock->semaphoreID < B_NO_ERROR ) {

    37 	    PR_DELETE( lock );

    38 	    lock = NULL;

    39 	}

    40     }

    42     return lock;

    43 }

    45 PR_IMPLEMENT(void)

    46     PR_DestroyLock (PRLock* lock)

    47 {

    48     status_t result;

    50     PR_ASSERT(NULL != lock);

    51     result = delete_sem(lock->semaphoreID);

    52     PR_ASSERT(result == B_NO_ERROR);

    53     PR_DELETE(lock);

    54 }

    56 PR_IMPLEMENT(void)

    57     PR_Lock (PRLock* lock)

    58 {

    59     PR_ASSERT(lock != NULL);

    61     if( atomic_add( &lock->benaphoreCount, 1 ) > 0 ) {

    63 	if( acquire_sem(lock->semaphoreID ) != B_NO_ERROR ) {

    65 	    atomic_add( &lock->benaphoreCount, -1 );

    66 	    return;

    67 	}

    68     }

    70     lock->owner = find_thread( NULL );

    71 }

    73 PR_IMPLEMENT(PRStatus)

    74     PR_Unlock (PRLock* lock)

    75 {

    76     PR_ASSERT(lock != NULL);

    77     lock->owner = NULL;

    78     if( atomic_add( &lock->benaphoreCount, -1 ) > 1 ) {

    80 	release_sem_etc( lock->semaphoreID, 1, B_DO_NOT_RESCHEDULE );

    81     }

    83     return PR_SUCCESS;

    84 }

    86 PR_IMPLEMENT(void)

    87     PR_AssertCurrentThreadOwnsLock(PRLock *lock)

    88 {

    89     PR_ASSERT(lock != NULL);

    90     PR_ASSERT(lock->owner == find_thread( NULL ));

    91 }

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