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/* -*- 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;
}
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