gecko-dev/nsprpub/pr/include/prcmon.h

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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.
*/
#ifndef prcmon_h___
#define prcmon_h___
/*
** Interface to cached monitors. Cached monitors use an address to find a
** given PR monitor. In this way a monitor can be associated with another
** object without preallocating a monitor for all objects.
**
** A hash table is used to quickly map addresses to individual monitors
** and the system automatically grows the hash table as needed.
**
** Cache monitors are about 5 times slower to use than uncached monitors.
*/
#include "prmon.h"
#include "prinrval.h"
PR_BEGIN_EXTERN_C
/**
** Like PR_EnterMonitor except use the "address" to find a monitor in the
** monitor cache. If successful, returns the PRMonitor now associated
** with "address". Note that you must PR_CExitMonitor the address to
** release the monitor cache entry (otherwise the monitor cache will fill
** up). This call will return NULL if the monitor cache needs to be
** expanded and the system is out of memory.
*/
NSPR_API(PRMonitor*) PR_CEnterMonitor(void *address);
/*
** Like PR_ExitMonitor except use the "address" to find a monitor in the
** monitor cache.
*/
NSPR_API(PRStatus) PR_CExitMonitor(void *address);
/*
** Like PR_Wait except use the "address" to find a monitor in the
** monitor cache.
*/
NSPR_API(PRStatus) PR_CWait(void *address, PRIntervalTime timeout);
/*
** Like PR_Notify except use the "address" to find a monitor in the
** monitor cache.
*/
NSPR_API(PRStatus) PR_CNotify(void *address);
/*
** Like PR_NotifyAll except use the "address" to find a monitor in the
** monitor cache.
*/
NSPR_API(PRStatus) PR_CNotifyAll(void *address);
/*
** Set a callback to be invoked each time a monitor is recycled from the cache
** freelist, with the monitor's cache-key passed in address.
*/
NSPR_API(void) PR_CSetOnMonitorRecycle(void (*callback)(void *address));
PR_END_EXTERN_C
#endif /* prcmon_h___ */