annotate nspr/pr/include/prcmon.h @ 3:150b72113545

Add DBM and legacydb support
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:32:02 +0200
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rev   line source
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 #ifndef prcmon_h___
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7 #define prcmon_h___
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8
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9 /*
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10 ** Interface to cached monitors. Cached monitors use an address to find a
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11 ** given PR monitor. In this way a monitor can be associated with another
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12 ** object without preallocating a monitor for all objects.
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13 **
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14 ** A hash table is used to quickly map addresses to individual monitors
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15 ** and the system automatically grows the hash table as needed.
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16 **
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17 ** Cache monitors are about 5 times slower to use than uncached monitors.
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18 */
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19 #include "prmon.h"
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20 #include "prinrval.h"
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21
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22 PR_BEGIN_EXTERN_C
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23
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24 /**
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25 ** Like PR_EnterMonitor except use the "address" to find a monitor in the
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26 ** monitor cache. If successful, returns the PRMonitor now associated
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27 ** with "address". Note that you must PR_CExitMonitor the address to
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28 ** release the monitor cache entry (otherwise the monitor cache will fill
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29 ** up). This call will return NULL if the monitor cache needs to be
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30 ** expanded and the system is out of memory.
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31 */
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32 NSPR_API(PRMonitor*) PR_CEnterMonitor(void *address);
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33
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34 /*
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35 ** Like PR_ExitMonitor except use the "address" to find a monitor in the
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36 ** monitor cache.
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37 */
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38 NSPR_API(PRStatus) PR_CExitMonitor(void *address);
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39
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40 /*
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41 ** Like PR_Wait except use the "address" to find a monitor in the
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42 ** monitor cache.
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43 */
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44 NSPR_API(PRStatus) PR_CWait(void *address, PRIntervalTime timeout);
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45
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46 /*
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47 ** Like PR_Notify except use the "address" to find a monitor in the
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48 ** monitor cache.
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49 */
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50 NSPR_API(PRStatus) PR_CNotify(void *address);
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51
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52 /*
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53 ** Like PR_NotifyAll except use the "address" to find a monitor in the
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54 ** monitor cache.
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55 */
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56 NSPR_API(PRStatus) PR_CNotifyAll(void *address);
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57
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58 /*
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59 ** Set a callback to be invoked each time a monitor is recycled from the cache
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60 ** freelist, with the monitor's cache-key passed in address.
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61 */
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62 NSPR_API(void) PR_CSetOnMonitorRecycle(void (PR_CALLBACK *callback)(void *address));
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63
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64 PR_END_EXTERN_C
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65
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66 #endif /* prcmon_h___ */
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