diff options
Diffstat (limited to 'src/libs/xpcom18a4/nsprpub/pr/src/bthreads/btlocks.c')
-rw-r--r-- | src/libs/xpcom18a4/nsprpub/pr/src/bthreads/btlocks.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/nsprpub/pr/src/bthreads/btlocks.c b/src/libs/xpcom18a4/nsprpub/pr/src/bthreads/btlocks.c new file mode 100644 index 00000000..c5b62860 --- /dev/null +++ b/src/libs/xpcom18a4/nsprpub/pr/src/bthreads/btlocks.c @@ -0,0 +1,116 @@ +/* -*- Mode: C++; c-basic-offset: 4 -*- */ +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla Public License Version + * 1.1 (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License + * for the specific language governing rights and limitations under the + * License. + * + * The Original Code is the Netscape Portable Runtime (NSPR). + * + * The Initial Developer of the Original Code is + * Netscape Communications Corporation. + * Portions created by the Initial Developer are Copyright (C) 1998-2000 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * + * Alternatively, the contents of this file may be used under the terms of + * either the GNU General Public License Version 2 or later (the "GPL"), or + * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +/* +** File: btlocks.c +** Description: Implemenation for thread locks using bthreads +** Exports: prlock.h +*/ + +#include "primpl.h" + +#include <string.h> +#include <sys/time.h> + +void +_PR_InitLocks (void) +{ +} + +PR_IMPLEMENT(PRLock*) + PR_NewLock (void) +{ + PRLock *lock; + status_t semresult; + + if (!_pr_initialized) _PR_ImplicitInitialization(); + + lock = PR_NEWZAP(PRLock); + if (lock != NULL) { + + lock->benaphoreCount = 0; + lock->semaphoreID = create_sem( 0, "nsprLockSem" ); + if( lock->semaphoreID < B_NO_ERROR ) { + + PR_DELETE( lock ); + lock = NULL; + } + } + + return lock; +} + +PR_IMPLEMENT(void) + PR_DestroyLock (PRLock* lock) +{ + status_t result; + + PR_ASSERT(NULL != lock); + result = delete_sem(lock->semaphoreID); + PR_ASSERT(result == B_NO_ERROR); + PR_DELETE(lock); +} + +PR_IMPLEMENT(void) + PR_Lock (PRLock* lock) +{ + PR_ASSERT(lock != NULL); + + if( atomic_add( &lock->benaphoreCount, 1 ) > 0 ) { + + if( acquire_sem(lock->semaphoreID ) != B_NO_ERROR ) { + + atomic_add( &lock->benaphoreCount, -1 ); + return; + } + } + + lock->owner = find_thread( NULL ); +} + +PR_IMPLEMENT(PRStatus) + PR_Unlock (PRLock* lock) +{ + PR_ASSERT(lock != NULL); + lock->owner = NULL; + if( atomic_add( &lock->benaphoreCount, -1 ) > 1 ) { + + release_sem( lock->semaphoreID ); + } + + return PR_SUCCESS; +} |