Mercurial > trustbridge > nss-cmake-static

annotate nspr/pr/src/threads/prsem.c @ 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 #include "primpl.h"
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7 #include "obsolete/prsem.h"
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8
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9 /************************************************************************/
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10
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11 /*
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12 ** Create a new semaphore.
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13 */
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14 PR_IMPLEMENT(PRSemaphore*) PR_NewSem(PRUintn value)
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15 {
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16 PRSemaphore *sem;
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17 PRCondVar *cvar;
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18 PRLock *lock;
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19
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20 sem = PR_NEWZAP(PRSemaphore);
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21 if (sem) {
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22 #ifdef HAVE_CVAR_BUILT_ON_SEM
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23 _PR_MD_NEW_SEM(&sem->md, value);
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24 #else
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25 lock = PR_NewLock();
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26 if (!lock) {
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27 PR_DELETE(sem);
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28 return NULL;
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29 }
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30
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31 cvar = PR_NewCondVar(lock);
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32 if (!cvar) {
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33 PR_DestroyLock(lock);
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34 PR_DELETE(sem);
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35 return NULL;
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36 }
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37 sem->cvar = cvar;
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38 sem->count = value;
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39 #endif
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40 }
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41 return sem;
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42 }
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43
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44 /*
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45 ** Destroy a semaphore. There must be no thread waiting on the semaphore.
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46 ** The caller is responsible for guaranteeing that the semaphore is
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47 ** no longer in use.
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48 */
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49 PR_IMPLEMENT(void) PR_DestroySem(PRSemaphore *sem)
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50 {
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51 #ifdef HAVE_CVAR_BUILT_ON_SEM
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52 _PR_MD_DESTROY_SEM(&sem->md);
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53 #else
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54 PR_ASSERT(sem->waiters == 0);
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55
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56 PR_DestroyLock(sem->cvar->lock);
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57 PR_DestroyCondVar(sem->cvar);
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58 #endif
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59 PR_DELETE(sem);
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60 }
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61
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62 /*
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63 ** Wait on a Semaphore.
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64 **
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65 ** This routine allows a calling thread to wait or proceed depending upon the
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66 ** state of the semahore sem. The thread can proceed only if the counter value
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67 ** of the semaphore sem is currently greater than 0. If the value of semaphore
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68 ** sem is positive, it is decremented by one and the routine returns immediately
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69 ** allowing the calling thread to continue. If the value of semaphore sem is 0,
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70 ** the calling thread blocks awaiting the semaphore to be released by another
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71 ** thread.
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72 **
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73 ** This routine can return PR_PENDING_INTERRUPT if the waiting thread
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74 ** has been interrupted.
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75 */
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76 PR_IMPLEMENT(PRStatus) PR_WaitSem(PRSemaphore *sem)
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77 {
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78 PRStatus status = PR_SUCCESS;
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79
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80 #ifdef HAVE_CVAR_BUILT_ON_SEM
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81 return _PR_MD_WAIT_SEM(&sem->md);
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82 #else
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83 PR_Lock(sem->cvar->lock);
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84 while (sem->count == 0) {
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85 sem->waiters++;
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86 status = PR_WaitCondVar(sem->cvar, PR_INTERVAL_NO_TIMEOUT);
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87 sem->waiters--;
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88 if (status != PR_SUCCESS)
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89 break;
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90 }
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91 if (status == PR_SUCCESS)
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92 sem->count--;
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93 PR_Unlock(sem->cvar->lock);
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94 #endif
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95
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96 return (status);
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97 }
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98
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99 /*
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100 ** This routine increments the counter value of the semaphore. If other threads
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101 ** are blocked for the semaphore, then the scheduler will determine which ONE
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102 ** thread will be unblocked.
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103 */
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104 PR_IMPLEMENT(void) PR_PostSem(PRSemaphore *sem)
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105 {
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106 #ifdef HAVE_CVAR_BUILT_ON_SEM
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107 _PR_MD_POST_SEM(&sem->md);
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108 #else
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109 PR_Lock(sem->cvar->lock);
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110 if (sem->waiters)
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111 PR_NotifyCondVar(sem->cvar);
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112 sem->count++;
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113 PR_Unlock(sem->cvar->lock);
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114 #endif
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115 }
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116
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117 #if DEBUG
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118 /*
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119 ** Returns the value of the semaphore referenced by sem without affecting
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120 ** the state of the semaphore. The value represents the semaphore vaule
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121 ** at the time of the call, but may not be the actual value when the
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122 ** caller inspects it. (FOR DEBUGGING ONLY)
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123 */
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124 PR_IMPLEMENT(PRUintn) PR_GetValueSem(PRSemaphore *sem)
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125 {
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126 PRUintn rv;
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127
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128 #ifdef HAVE_CVAR_BUILT_ON_SEM
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129 rv = _PR_MD_GET_VALUE_SEM(&sem->md);
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130 #else
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131 PR_Lock(sem->cvar->lock);
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132 rv = sem->count;
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133 PR_Unlock(sem->cvar->lock);
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Andre Heinecke <andre.heinecke@intevation.de>
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134 #endif
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Andre Heinecke <andre.heinecke@intevation.de>
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135
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136 return rv;
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137 }
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138 #endif
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