Mercurial > trustbridge > nss-cmake-static

annotate nspr/pr/src/threads/prmon.c @ 3:150b72113545

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Add DBM and legacydb support
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:32:02 +0200
parents 1e5118fa0cb1
children
rev   line source
0
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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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
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8 /************************************************************************/
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9
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10 /*
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11 * Notifies just get posted to the monitor. The actual notification is done
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12 * when the monitor is fully exited so that MP systems don't contend for a
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13 * monitor that they can't enter.
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14 */
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15 static void _PR_PostNotifyToMonitor(PRMonitor *mon, PRBool broadcast)
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16 {
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17 PR_ASSERT(mon != NULL);
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18 PR_ASSERT_CURRENT_THREAD_IN_MONITOR(mon);
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19
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20 /* mon->notifyTimes is protected by the monitor, so we don't need to
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21 * acquire mon->lock.
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22 */
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23 if (broadcast)
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24 mon->notifyTimes = -1;
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25 else if (mon->notifyTimes != -1)
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26 mon->notifyTimes += 1;
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27 }
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28
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29 static void _PR_PostNotifiesFromMonitor(PRCondVar *cv, PRIntn times)
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30 {
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31 PRStatus rv;
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32
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33 /*
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34 * Time to actually notify any waits that were affected while the monitor
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35 * was entered.
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36 */
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37 PR_ASSERT(cv != NULL);
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38 PR_ASSERT(times != 0);
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39 if (times == -1) {
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40 rv = PR_NotifyAllCondVar(cv);
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41 PR_ASSERT(rv == PR_SUCCESS);
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42 } else {
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43 while (times-- > 0) {
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44 rv = PR_NotifyCondVar(cv);
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45 PR_ASSERT(rv == PR_SUCCESS);
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46 }
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47 }
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48 }
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49
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50 /*
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51 ** Create a new monitor.
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52 */
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53 PR_IMPLEMENT(PRMonitor*) PR_NewMonitor()
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54 {
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55 PRMonitor *mon;
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56 PRStatus rv;
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57
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58 if (!_pr_initialized) _PR_ImplicitInitialization();
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59
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60 mon = PR_NEWZAP(PRMonitor);
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61 if (mon == NULL) {
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62 PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
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63 return NULL;
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64 }
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65
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66 rv = _PR_InitLock(&mon->lock);
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67 PR_ASSERT(rv == PR_SUCCESS);
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68 if (rv != PR_SUCCESS)
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69 goto error1;
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70
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71 mon->owner = NULL;
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72
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73 rv = _PR_InitCondVar(&mon->entryCV, &mon->lock);
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74 PR_ASSERT(rv == PR_SUCCESS);
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75 if (rv != PR_SUCCESS)
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76 goto error2;
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77
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78 rv = _PR_InitCondVar(&mon->waitCV, &mon->lock);
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79 PR_ASSERT(rv == PR_SUCCESS);
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80 if (rv != PR_SUCCESS)
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81 goto error3;
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82
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83 mon->notifyTimes = 0;
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84 mon->entryCount = 0;
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85 mon->name = NULL;
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86 return mon;
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87
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88 error3:
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89 _PR_FreeCondVar(&mon->entryCV);
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90 error2:
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91 _PR_FreeLock(&mon->lock);
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92 error1:
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93 PR_Free(mon);
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94 return NULL;
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95 }
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96
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97 PR_IMPLEMENT(PRMonitor*) PR_NewNamedMonitor(const char* name)
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98 {
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99 PRMonitor* mon = PR_NewMonitor();
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100 if (mon)
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101 mon->name = name;
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102 return mon;
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103 }
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104
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105 /*
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106 ** Destroy a monitor. There must be no thread waiting on the monitor's
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107 ** condition variable. The caller is responsible for guaranteeing that the
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108 ** monitor is no longer in use.
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109 */
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110 PR_IMPLEMENT(void) PR_DestroyMonitor(PRMonitor *mon)
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111 {
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112 PR_ASSERT(mon != NULL);
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113 _PR_FreeCondVar(&mon->waitCV);
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114 _PR_FreeCondVar(&mon->entryCV);
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115 _PR_FreeLock(&mon->lock);
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116 #if defined(DEBUG)
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117 memset(mon, 0xaf, sizeof(PRMonitor));
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118 #endif
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119 PR_Free(mon);
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120 }
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121
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122 /*
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123 ** Enter the lock associated with the monitor.
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124 */
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125 PR_IMPLEMENT(void) PR_EnterMonitor(PRMonitor *mon)
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126 {
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127 PRThread *me = _PR_MD_CURRENT_THREAD();
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128 PRStatus rv;
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129
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130 PR_ASSERT(mon != NULL);
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131 PR_Lock(&mon->lock);
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132 if (mon->entryCount != 0) {
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133 if (mon->owner == me)
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134 goto done;
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parents:
diff changeset
135 while (mon->entryCount != 0) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
136 rv = PR_WaitCondVar(&mon->entryCV, PR_INTERVAL_NO_TIMEOUT);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
137 PR_ASSERT(rv == PR_SUCCESS);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
138 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
139 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
140 /* and now I have the monitor */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
141 PR_ASSERT(mon->notifyTimes == 0);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
142 PR_ASSERT(mon->owner == NULL);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
143 mon->owner = me;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
144
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
145 done:
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
146 mon->entryCount += 1;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
147 rv = PR_Unlock(&mon->lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
148 PR_ASSERT(rv == PR_SUCCESS);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
149 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
150
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
151 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
152 ** Test and then enter the lock associated with the monitor if it's not
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
153 ** already entered by some other thread. Return PR_FALSE if some other
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
154 ** thread owned the lock at the time of the call.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
155 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
156 PR_IMPLEMENT(PRBool) PR_TestAndEnterMonitor(PRMonitor *mon)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
157 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
158 PRThread *me = _PR_MD_CURRENT_THREAD();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
159 PRStatus rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
160
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
161 PR_ASSERT(mon != NULL);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
162 PR_Lock(&mon->lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
163 if (mon->entryCount != 0) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
164 if (mon->owner == me)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
165 goto done;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
166 rv = PR_Unlock(&mon->lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
167 PR_ASSERT(rv == PR_SUCCESS);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
168 return PR_FALSE;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
169 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
170 /* and now I have the monitor */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
171 PR_ASSERT(mon->notifyTimes == 0);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
172 PR_ASSERT(mon->owner == NULL);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
173 mon->owner = me;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
174
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
175 done:
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
176 mon->entryCount += 1;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
177 rv = PR_Unlock(&mon->lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
178 PR_ASSERT(rv == PR_SUCCESS);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
179 return PR_TRUE;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
180 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
181
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
182 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
183 ** Exit the lock associated with the monitor once.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
184 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
185 PR_IMPLEMENT(PRStatus) PR_ExitMonitor(PRMonitor *mon)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
186 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
187 PRThread *me = _PR_MD_CURRENT_THREAD();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
188 PRStatus rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
189
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
190 PR_ASSERT(mon != NULL);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
191 PR_Lock(&mon->lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
192 /* the entries should be > 0 and we'd better be the owner */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
193 PR_ASSERT(mon->entryCount > 0);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
194 PR_ASSERT(mon->owner == me);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
195 if (mon->entryCount == 0 || mon->owner != me)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
196 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
197 rv = PR_Unlock(&mon->lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
198 PR_ASSERT(rv == PR_SUCCESS);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
199 return PR_FAILURE;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
200 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
201
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
202 mon->entryCount -= 1; /* reduce by one */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
203 if (mon->entryCount == 0)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
204 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
205 /* and if it transitioned to zero - notify an entry waiter */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
206 /* make the owner unknown */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
207 mon->owner = NULL;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
208 if (mon->notifyTimes != 0) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
209 _PR_PostNotifiesFromMonitor(&mon->waitCV, mon->notifyTimes);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
210 mon->notifyTimes = 0;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
211 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
212 rv = PR_NotifyCondVar(&mon->entryCV);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
213 PR_ASSERT(rv == PR_SUCCESS);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
214 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
215 rv = PR_Unlock(&mon->lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
216 PR_ASSERT(rv == PR_SUCCESS);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
217 return PR_SUCCESS;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
218 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
219
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
220 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
221 ** Return the number of times that the current thread has entered the
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
222 ** lock. Returns zero if the current thread has not entered the lock.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
223 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
224 PR_IMPLEMENT(PRIntn) PR_GetMonitorEntryCount(PRMonitor *mon)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
225 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
226 PRThread *me = _PR_MD_CURRENT_THREAD();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
227 PRStatus rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
228 PRIntn count = 0;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
229
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
230 PR_Lock(&mon->lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
231 if (mon->owner == me)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
232 count = mon->entryCount;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
233 rv = PR_Unlock(&mon->lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
234 PR_ASSERT(rv == PR_SUCCESS);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
235 return count;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
236 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
237
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
238 PR_IMPLEMENT(void) PR_AssertCurrentThreadInMonitor(PRMonitor *mon)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
239 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
240 #if defined(DEBUG) || defined(FORCE_PR_ASSERT)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
241 PRStatus rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
242
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
243 PR_Lock(&mon->lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
244 PR_ASSERT(mon->entryCount != 0 &&
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
245 mon->owner == _PR_MD_CURRENT_THREAD());
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
246 rv = PR_Unlock(&mon->lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
247 PR_ASSERT(rv == PR_SUCCESS);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
248 #endif
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
249 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
250
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
251 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
252 ** Wait for a notify on the condition variable. Sleep for "ticks" amount
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
253 ** of time (if "tick" is 0 then the sleep is indefinite). While
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
254 ** the thread is waiting it exits the monitors lock (as if it called
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
255 ** PR_ExitMonitor as many times as it had called PR_EnterMonitor). When
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
256 ** the wait has finished the thread regains control of the monitors lock
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
257 ** with the same entry count as before the wait began.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
258 **
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
259 ** The thread waiting on the monitor will be resumed when the monitor is
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
260 ** notified (assuming the thread is the next in line to receive the
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
261 ** notify) or when the "ticks" elapses.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
262 **
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
263 ** Returns PR_FAILURE if the caller has not locked the lock associated
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
264 ** with the condition variable.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
265 ** This routine can return PR_PENDING_INTERRUPT_ERROR if the waiting thread
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
266 ** has been interrupted.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
267 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
268 PR_IMPLEMENT(PRStatus) PR_Wait(PRMonitor *mon, PRIntervalTime ticks)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
269 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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270 PRStatus rv;
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271 PRUint32 saved_entries;
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272 PRThread *saved_owner;
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273
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274 PR_ASSERT(mon != NULL);
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275 PR_Lock(&mon->lock);
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276 /* the entries better be positive */
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277 PR_ASSERT(mon->entryCount > 0);
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278 /* and it better be owned by us */
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279 PR_ASSERT(mon->owner == _PR_MD_CURRENT_THREAD()); /* XXX return failure */
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280
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281 /* tuck these away 'till later */
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282 saved_entries = mon->entryCount;
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283 mon->entryCount = 0;
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284 saved_owner = mon->owner;
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285 mon->owner = NULL;
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286 /* If we have pending notifies, post them now. */
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287 if (mon->notifyTimes != 0) {
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288 _PR_PostNotifiesFromMonitor(&mon->waitCV, mon->notifyTimes);
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289 mon->notifyTimes = 0;
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290 }
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291 rv = PR_NotifyCondVar(&mon->entryCV);
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292 PR_ASSERT(rv == PR_SUCCESS);
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293
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294 rv = PR_WaitCondVar(&mon->waitCV, ticks);
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295 PR_ASSERT(rv == PR_SUCCESS);
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296
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297 while (mon->entryCount != 0) {
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298 rv = PR_WaitCondVar(&mon->entryCV, PR_INTERVAL_NO_TIMEOUT);
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299 PR_ASSERT(rv == PR_SUCCESS);
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300 }
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301 PR_ASSERT(mon->notifyTimes == 0);
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302 /* reinstate the interesting information */
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303 mon->entryCount = saved_entries;
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304 mon->owner = saved_owner;
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305
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306 rv = PR_Unlock(&mon->lock);
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307 PR_ASSERT(rv == PR_SUCCESS);
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308 return rv;
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309 }
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310
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311 /*
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312 ** Notify the highest priority thread waiting on the condition
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313 ** variable. If a thread is waiting on the condition variable (using
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314 ** PR_Wait) then it is awakened and begins waiting on the monitor's lock.
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315 */
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316 PR_IMPLEMENT(PRStatus) PR_Notify(PRMonitor *mon)
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317 {
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318 _PR_PostNotifyToMonitor(mon, PR_FALSE);
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319 return PR_SUCCESS;
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320 }
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321
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322 /*
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323 ** Notify all of the threads waiting on the condition variable. All of
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324 ** threads are notified in turn. The highest priority thread will
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325 ** probably acquire the monitor first when the monitor is exited.
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326 */
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327 PR_IMPLEMENT(PRStatus) PR_NotifyAll(PRMonitor *mon)
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328 {
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329 _PR_PostNotifyToMonitor(mon, PR_TRUE);
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330 return PR_SUCCESS;
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331 }
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332
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333 /************************************************************************/
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334
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335 PRUint32 _PR_MonitorToString(PRMonitor *mon, char *buf, PRUint32 buflen)
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336 {
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337 PRUint32 nb;
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338
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339 if (mon->owner) {
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340 nb = PR_snprintf(buf, buflen, "[%p] owner=%d[%p] count=%ld",
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341 mon, mon->owner->id, mon->owner, mon->entryCount);
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342 } else {
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343 nb = PR_snprintf(buf, buflen, "[%p]", mon);
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344 }
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345 return nb;
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346 }
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