third_party/npapi/npspy/extern/nspr/prcmon.h

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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   3  * The contents of this file are subject to the Mozilla Public
   4  * License Version 1.1 (the "License"); you may not use this file
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  13  * The Original Code is the Netscape Portable Runtime (NSPR).
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  34
  35 #ifndef prcmon_h___
  36 #define prcmon_h___
  37
  38 /*
  39 ** Interface to cached monitors. Cached monitors use an address to find a
  40 ** given PR monitor. In this way a monitor can be associated with another
  41 ** object without preallocating a monitor for all objects.
  42 **
  43 ** A hash table is used to quickly map addresses to individual monitors
  44 ** and the system automatically grows the hash table as needed.
  45 **
  46 ** Cache monitors are about 5 times slower to use than uncached monitors.
  47 */
  48 #include "prmon.h"
  49 #include "prinrval.h"
  50
  51 PR_BEGIN_EXTERN_C
  52
  53 /**
  54 ** Like PR_EnterMonitor except use the "address" to find a monitor in the
  55 ** monitor cache. If successful, returns the PRMonitor now associated
  56 ** with "address". Note that you must PR_CExitMonitor the address to
  57 ** release the monitor cache entry (otherwise the monitor cache will fill
  58 ** up). This call will return NULL if the monitor cache needs to be
  59 ** expanded and the system is out of memory.
  60 */
  61 NSPR_API(PRMonitor*) PR_CEnterMonitor(void *address);
  62
  63 /*
  64 ** Like PR_ExitMonitor except use the "address" to find a monitor in the
  65 ** monitor cache.
  66 */
  67 NSPR_API(PRStatus) PR_CExitMonitor(void *address);
  68
  69 /*
  70 ** Like PR_Wait except use the "address" to find a monitor in the
  71 ** monitor cache.
  72 */
  73 NSPR_API(PRStatus) PR_CWait(void *address, PRIntervalTime timeout);
  74
  75 /*
  76 ** Like PR_Notify except use the "address" to find a monitor in the
  77 ** monitor cache.
  78 */
  79 NSPR_API(PRStatus) PR_CNotify(void *address);
  80
  81 /*
  82 ** Like PR_NotifyAll except use the "address" to find a monitor in the
  83 ** monitor cache.
  84 */
  85 NSPR_API(PRStatus) PR_CNotifyAll(void *address);
  86
  87 /*
  88 ** Set a callback to be invoked each time a monitor is recycled from the cache
  89 ** freelist, with the monitor's cache-key passed in address.
  90 */
  91 NSPR_API(void) PR_CSetOnMonitorRecycle(void (PR_CALLBACK *callback)(void *address));
  92
  93 PR_END_EXTERN_C
  94
  95 #endif /* prcmon_h___ */