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annotate nspr/pr/include/prcvar.h @ 1:247cffdc9b89

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Add a pesodo config file for inlcude directories and library names
author Andre Heinecke <andre.heinecke@intevation.de>
date Mon, 28 Jul 2014 13:00:06 +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 prcvar_h___
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7 #define prcvar_h___
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8
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9 #include "prlock.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 PRCondVar PRCondVar;
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15
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16 /*
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17 ** Create a new condition variable.
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18 **
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19 ** "lock" is the lock used to protect the condition variable.
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20 **
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21 ** Condition variables are synchronization objects that threads can use
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22 ** to wait for some condition to occur.
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23 **
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24 ** This may fail if memory is tight or if some operating system resource
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25 ** is low. In such cases, a NULL will be returned.
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26 */
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27 NSPR_API(PRCondVar*) PR_NewCondVar(PRLock *lock);
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28
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29 /*
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30 ** Destroy a condition variable. There must be no thread
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31 ** waiting on the condvar. The caller is responsible for guaranteeing
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32 ** that the condvar is no longer in use.
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33 **
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34 */
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35 NSPR_API(void) PR_DestroyCondVar(PRCondVar *cvar);
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36
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37 /*
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38 ** The thread that waits on a condition is blocked in a "waiting on
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39 ** condition" state until another thread notifies the condition or a
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40 ** caller specified amount of time expires. The lock associated with
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41 ** the condition variable will be released, which must have be held
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42 ** prior to the call to wait.
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43 **
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44 ** Logically a notified thread is moved from the "waiting on condition"
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45 ** state and made "ready." When scheduled, it will attempt to reacquire
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46 ** the lock that it held when wait was called.
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47 **
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48 ** The timeout has two well known values, PR_INTERVAL_NO_TIMEOUT and
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49 ** PR_INTERVAL_NO_WAIT. The former value requires that a condition be
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50 ** notified (or the thread interrupted) before it will resume from the
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51 ** wait. If the timeout has a value of PR_INTERVAL_NO_WAIT, the effect
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52 ** is to release the lock, possibly causing a rescheduling within the
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53 ** runtime, then immediately attempting to reacquire the lock and resume.
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54 **
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55 ** Any other value for timeout will cause the thread to be rescheduled
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56 ** either due to explicit notification or an expired interval. The latter
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57 ** must be determined by treating time as one part of the monitored data
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58 ** being protected by the lock and tested explicitly for an expired
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59 ** interval.
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60 **
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61 ** Returns PR_FAILURE if the caller has not locked the lock associated
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62 ** with the condition variable or the thread was interrupted (PR_Interrupt()).
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63 ** The particular reason can be extracted with PR_GetError().
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64 */
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65 NSPR_API(PRStatus) PR_WaitCondVar(PRCondVar *cvar, PRIntervalTime timeout);
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66
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67 /*
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68 ** Notify ONE thread that is currently waiting on 'cvar'. Which thread is
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69 ** dependent on the implementation of the runtime. Common sense would dictate
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70 ** that all threads waiting on a single condition have identical semantics,
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71 ** therefore which one gets notified is not significant.
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72 **
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73 ** The calling thead must hold the lock that protects the condition, as
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74 ** well as the invariants that are tightly bound to the condition, when
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75 ** notify is called.
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76 **
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77 ** Returns PR_FAILURE if the caller has not locked the lock associated
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78 ** with the condition variable.
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79 */
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80 NSPR_API(PRStatus) PR_NotifyCondVar(PRCondVar *cvar);
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81
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82 /*
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83 ** Notify all of the threads waiting on the condition variable. The order
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84 ** that the threads are notified is indeterminant. The lock that protects
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85 ** the condition must be held.
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86 **
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87 ** Returns PR_FAILURE if the caller has not locked the lock associated
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88 ** with the condition variable.
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89 */
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90 NSPR_API(PRStatus) PR_NotifyAllCondVar(PRCondVar *cvar);
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91
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92 PR_END_EXTERN_C
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93
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94 #endif /* prcvar_h___ */
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