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annotate nspr/pr/include/prmon.h @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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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 prmon_h___
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7 #define prmon_h___
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8
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9 #include "prtypes.h"
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10 #include "prinrval.h"
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11
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12 PR_BEGIN_EXTERN_C
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13
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14 typedef struct PRMonitor PRMonitor;
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15
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16 /*
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17 ** Create a new monitor. Monitors are re-entrant locks with a single built-in
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18 ** condition variable.
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19 **
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20 ** This may fail if memory is tight or if some operating system resource
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21 ** is low.
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22 */
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23 NSPR_API(PRMonitor*) PR_NewMonitor(void);
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24
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25 /*
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26 ** Destroy a monitor. The caller is responsible for guaranteeing that the
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27 ** monitor is no longer in use. There must be no thread waiting on the monitor's
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28 ** condition variable and that the lock is not held.
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29 **
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30 */
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31 NSPR_API(void) PR_DestroyMonitor(PRMonitor *mon);
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32
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33 /*
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34 ** Enter the lock associated with the monitor. If the calling thread currently
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35 ** is in the monitor, the call to enter will silently succeed. In either case,
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36 ** it will increment the entry count by one.
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37 */
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38 NSPR_API(void) PR_EnterMonitor(PRMonitor *mon);
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39
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40 /*
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41 ** Decrement the entry count associated with the monitor. If the decremented
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42 ** entry count is zero, the monitor is exited. Returns PR_FAILURE if the
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43 ** calling thread has not entered the monitor.
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44 */
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45 NSPR_API(PRStatus) PR_ExitMonitor(PRMonitor *mon);
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46
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47 /*
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48 ** Wait for a notify on the monitor's condition variable. Sleep for "ticks"
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49 ** amount of time (if "ticks" is PR_INTERVAL_NO_TIMEOUT then the sleep is
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50 ** indefinite).
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51 **
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52 ** While the thread is waiting it exits the monitor (as if it called
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53 ** PR_ExitMonitor as many times as it had called PR_EnterMonitor). When
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54 ** the wait has finished the thread regains control of the monitors lock
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55 ** with the same entry count as before the wait began.
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56 **
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57 ** The thread waiting on the monitor will be resumed when the monitor is
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58 ** notified (assuming the thread is the next in line to receive the
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59 ** notify) or when the "ticks" timeout elapses.
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60 **
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61 ** Returns PR_FAILURE if the caller has not entered the monitor.
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62 */
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63 NSPR_API(PRStatus) PR_Wait(PRMonitor *mon, PRIntervalTime ticks);
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64
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65 /*
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66 ** Notify a thread waiting on the monitor's condition variable. If a thread
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67 ** is waiting on the condition variable (using PR_Wait) then it is awakened
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68 ** and attempts to reenter the monitor.
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69 */
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70 NSPR_API(PRStatus) PR_Notify(PRMonitor *mon);
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71
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72 /*
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73 ** Notify all of the threads waiting on the monitor's condition variable.
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74 ** All of threads waiting on the condition are scheduled to reenter the
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75 ** monitor.
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76 */
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77 NSPR_API(PRStatus) PR_NotifyAll(PRMonitor *mon);
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78
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79 /*
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80 ** PR_ASSERT_CURRENT_THREAD_IN_MONITOR
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81 ** If the current thread is in |mon|, this assertion is guaranteed to
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82 ** succeed. Otherwise, the behavior of this function is undefined.
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83 */
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84 #if defined(DEBUG) || defined(FORCE_PR_ASSERT)
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85 #define PR_ASSERT_CURRENT_THREAD_IN_MONITOR(/* PRMonitor* */ mon) \
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86 PR_AssertCurrentThreadInMonitor(mon)
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87 #else
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88 #define PR_ASSERT_CURRENT_THREAD_IN_MONITOR(/* PRMonitor* */ mon)
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89 #endif
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90
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91 /* Don't call this function directly. */
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92 NSPR_API(void) PR_AssertCurrentThreadInMonitor(PRMonitor *mon);
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93
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94 PR_END_EXTERN_C
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95
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96 #endif /* prmon_h___ */
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