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/* -*- Mode: C++; c-basic-offset: 4 -*- */
/* 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/. */
/*
** 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_etc( lock->semaphoreID, 1, B_DO_NOT_RESCHEDULE );
}
return PR_SUCCESS;
}
PR_IMPLEMENT(void)
PR_AssertCurrentThreadOwnsLock(PRLock *lock)
{
PR_ASSERT(lock != NULL);
PR_ASSERT(lock->owner == find_thread( NULL ));
}
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