prcmon.h - mozsearch

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* 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/. */

#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 (PR_CALLBACK *callback)(void *address));

PR_END_EXTERN_C

#endif /* prcmon_h___ */