mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-05 16:46:26 +00:00
119 lines
4.2 KiB
C
119 lines
4.2 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/*
|
|
* 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 Netscape are
|
|
* Copyright (C) 1998-2000 Netscape Communications Corporation. All
|
|
* Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* Alternatively, the contents of this file may be used under the
|
|
* terms of the GNU General Public License Version 2 or later (the
|
|
* "GPL"), in which case the provisions of the GPL are applicable
|
|
* instead of those above. If you wish to allow use of your
|
|
* version of this file only under the terms of the GPL and not to
|
|
* allow others to use your version of this file under the MPL,
|
|
* indicate your decision by deleting the provisions above and
|
|
* replace them with the notice and other provisions required by
|
|
* the GPL. If you do not delete the provisions above, a recipient
|
|
* may use your version of this file under either the MPL or the
|
|
* GPL.
|
|
*/
|
|
|
|
/*
|
|
** File: prlock.h
|
|
** Description: API to basic locking functions of NSPR.
|
|
**
|
|
**
|
|
** NSPR provides basic locking mechanisms for thread synchronization. Locks
|
|
** are lightweight resource contention controls that prevent multiple threads
|
|
** from accessing something (code/data) simultaneously.
|
|
**/
|
|
|
|
#ifndef prlock_h___
|
|
#define prlock_h___
|
|
|
|
#include "prtypes.h"
|
|
|
|
PR_BEGIN_EXTERN_C
|
|
|
|
/**********************************************************************/
|
|
/************************* TYPES AND CONSTANTS ************************/
|
|
/**********************************************************************/
|
|
|
|
/*
|
|
* PRLock --
|
|
*
|
|
* NSPR represents the lock as an opaque entity to the client of the
|
|
* API. All routines operate on a pointer to this opaque entity.
|
|
*/
|
|
|
|
typedef struct PRLock PRLock;
|
|
|
|
/**********************************************************************/
|
|
/****************************** FUNCTIONS *****************************/
|
|
/**********************************************************************/
|
|
|
|
/***********************************************************************
|
|
** FUNCTION: PR_NewLock
|
|
** DESCRIPTION:
|
|
** Returns a pointer to a newly created opaque lock object.
|
|
** INPUTS: void
|
|
** OUTPUTS: void
|
|
** RETURN: PRLock*
|
|
** If the lock can not be created because of resource constraints, NULL
|
|
** is returned.
|
|
**
|
|
***********************************************************************/
|
|
NSPR_API(PRLock*) PR_NewLock(void);
|
|
|
|
/***********************************************************************
|
|
** FUNCTION: PR_DestroyLock
|
|
** DESCRIPTION:
|
|
** Destroys a given opaque lock object.
|
|
** INPUTS: PRLock *lock
|
|
** Lock to be freed.
|
|
** OUTPUTS: void
|
|
** RETURN: None
|
|
***********************************************************************/
|
|
NSPR_API(void) PR_DestroyLock(PRLock *lock);
|
|
|
|
/***********************************************************************
|
|
** FUNCTION: PR_Lock
|
|
** DESCRIPTION:
|
|
** Lock a lock.
|
|
** INPUTS: PRLock *lock
|
|
** Lock to locked.
|
|
** OUTPUTS: void
|
|
** RETURN: None
|
|
***********************************************************************/
|
|
NSPR_API(void) PR_Lock(PRLock *lock);
|
|
|
|
/***********************************************************************
|
|
** FUNCTION: PR_Unlock
|
|
** DESCRIPTION:
|
|
** Unlock a lock. Unlocking an unlocked lock has undefined results.
|
|
** INPUTS: PRLock *lock
|
|
** Lock to unlocked.
|
|
** OUTPUTS: void
|
|
** RETURN: PR_STATUS
|
|
** Returns PR_FAILURE if the caller does not own the lock.
|
|
***********************************************************************/
|
|
NSPR_API(PRStatus) PR_Unlock(PRLock *lock);
|
|
|
|
PR_END_EXTERN_C
|
|
|
|
#endif /* prlock_h___ */
|