mirror of
https://github.com/signalwire/freeswitch.git
synced 2025-05-24 07:59:19 +00:00
fff98f6316
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3693 d0543943-73ff-0310-b7d9-9358b9ac24b2
131 lines
4.0 KiB
C
131 lines
4.0 KiB
C
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; 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 ***** */
|
|
|
|
#include <kernel/OS.h>
|
|
|
|
#include "primpl.h"
|
|
|
|
/*
|
|
** Create a new semaphore object.
|
|
*/
|
|
PR_IMPLEMENT(PRSemaphore*)
|
|
PR_NewSem (PRUintn value)
|
|
{
|
|
PRSemaphore *semaphore;
|
|
|
|
if (!_pr_initialized) _PR_ImplicitInitialization();
|
|
|
|
semaphore = PR_NEWZAP(PRSemaphore);
|
|
if (NULL != semaphore) {
|
|
if ((semaphore->sem = create_sem(value, "nspr_sem")) < B_NO_ERROR)
|
|
return NULL;
|
|
else
|
|
return semaphore;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
** Destroy the given semaphore object.
|
|
**
|
|
*/
|
|
PR_IMPLEMENT(void)
|
|
PR_DestroySem (PRSemaphore *sem)
|
|
{
|
|
status_t result;
|
|
|
|
PR_ASSERT(sem != NULL);
|
|
result = delete_sem(sem->sem);
|
|
PR_ASSERT(result == B_NO_ERROR);
|
|
PR_DELETE(sem);
|
|
}
|
|
|
|
/*
|
|
** Wait on a Semaphore.
|
|
**
|
|
** This routine allows a calling thread to wait or proceed depending upon
|
|
** the state of the semahore sem. The thread can proceed only if the
|
|
** counter value of the semaphore sem is currently greater than 0. If the
|
|
** value of semaphore sem is positive, it is decremented by one and the
|
|
** routine returns immediately allowing the calling thread to continue. If
|
|
** the value of semaphore sem is 0, the calling thread blocks awaiting the
|
|
** semaphore to be released by another thread.
|
|
**
|
|
** This routine can return PR_PENDING_INTERRUPT if the waiting thread
|
|
** has been interrupted.
|
|
*/
|
|
PR_IMPLEMENT(PRStatus)
|
|
PR_WaitSem (PRSemaphore *sem)
|
|
{
|
|
PR_ASSERT(sem != NULL);
|
|
if (acquire_sem(sem->sem) == B_NO_ERROR)
|
|
return PR_SUCCESS;
|
|
else
|
|
return PR_FAILURE;
|
|
}
|
|
|
|
/*
|
|
** This routine increments the counter value of the semaphore. If other
|
|
** threads are blocked for the semaphore, then the scheduler will
|
|
** determine which ONE thread will be unblocked.
|
|
*/
|
|
PR_IMPLEMENT(void)
|
|
PR_PostSem (PRSemaphore *sem)
|
|
{
|
|
status_t result;
|
|
|
|
PR_ASSERT(sem != NULL);
|
|
result = release_sem_etc(sem->sem, 1, B_DO_NOT_RESCHEDULE);
|
|
PR_ASSERT(result == B_NO_ERROR);
|
|
}
|
|
|
|
/*
|
|
** Returns the value of the semaphore referenced by sem without affecting
|
|
** the state of the semaphore. The value represents the semaphore value
|
|
** at the time of the call, but may not be the actual value when the
|
|
** caller inspects it.
|
|
*/
|
|
PR_IMPLEMENT(PRUintn)
|
|
PR_GetValueSem (PRSemaphore *sem)
|
|
{
|
|
sem_info info;
|
|
|
|
PR_ASSERT(sem != NULL);
|
|
get_sem_info(sem->sem, &info);
|
|
return info.count;
|
|
}
|