Mercurial > trustbridge > nss-cmake-static

annotate nspr/pr/src/md/windows/w95cv.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 /*
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7 * w95cv.c -- Windows 95 Machine-Dependent Code for Condition Variables
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8 *
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9 * We implement our own condition variable wait queue. Each thread
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10 * has a semaphore object (thread->md.blocked_sema) to block on while
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11 * waiting on a condition variable.
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12 *
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13 * We use a deferred condition notify algorithm. When PR_NotifyCondVar
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14 * or PR_NotifyAllCondVar is called, the condition notifies are simply
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15 * recorded in the _MDLock structure. We defer the condition notifies
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16 * until right after we unlock the lock. This way the awakened threads
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17 * have a better chance to reaquire the lock.
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18 */
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19
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20 #include "primpl.h"
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21
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22 /*
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23 * AddThreadToCVWaitQueueInternal --
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24 *
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25 * Add the thread to the end of the condition variable's wait queue.
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26 * The CV's lock must be locked when this function is called.
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27 */
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28
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29 static void
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30 AddThreadToCVWaitQueueInternal(PRThread *thred, struct _MDCVar *cv)
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31 {
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32 PR_ASSERT((cv->waitTail != NULL && cv->waitHead != NULL)
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33 || (cv->waitTail == NULL && cv->waitHead == NULL));
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34 cv->nwait += 1;
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35 thred->md.inCVWaitQueue = PR_TRUE;
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36 thred->md.next = NULL;
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37 thred->md.prev = cv->waitTail;
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38 if (cv->waitHead == NULL) {
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39 cv->waitHead = thred;
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40 } else {
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41 cv->waitTail->md.next = thred;
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42 }
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43 cv->waitTail = thred;
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44 }
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45
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46 /*
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47 * md_UnlockAndPostNotifies --
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48 *
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49 * Unlock the lock, and then do the deferred condition notifies.
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50 * If waitThred and waitCV are not NULL, waitThred is added to
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51 * the wait queue of waitCV before the lock is unlocked.
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52 *
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53 * This function is called by _PR_MD_WAIT_CV and _PR_MD_UNLOCK,
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54 * the two places where a lock is unlocked.
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55 */
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56 static void
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57 md_UnlockAndPostNotifies(
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58 _MDLock *lock,
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59 PRThread *waitThred,
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60 _MDCVar *waitCV)
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61 {
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62 PRIntn index;
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63 _MDNotified post;
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64 _MDNotified *notified, *prev = NULL;
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65
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66 /*
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67 * Time to actually notify any conditions that were affected
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68 * while the lock was held. Get a copy of the list that's in
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69 * the lock structure and then zero the original. If it's
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70 * linked to other such structures, we own that storage.
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71 */
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72 post = lock->notified; /* a safe copy; we own the lock */
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73
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74 #if defined(DEBUG)
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75 ZeroMemory(&lock->notified, sizeof(_MDNotified)); /* reset */
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76 #else
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77 lock->notified.length = 0; /* these are really sufficient */
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78 lock->notified.link = NULL;
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79 #endif
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80
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81 /*
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82 * Figure out how many threads we need to wake up.
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83 */
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84 notified = &post; /* this is where we start */
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85 do {
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86 for (index = 0; index < notified->length; ++index) {
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87 _MDCVar *cv = notified->cv[index].cv;
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88 PRThread *thred;
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89 int i;
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90
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91 /* Fast special case: no waiting threads */
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92 if (cv->waitHead == NULL) {
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93 notified->cv[index].notifyHead = NULL;
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94 continue;
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95 }
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96
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97 /* General case */
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98 if (-1 == notified->cv[index].times) {
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99 /* broadcast */
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100 thred = cv->waitHead;
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101 while (thred != NULL) {
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102 thred->md.inCVWaitQueue = PR_FALSE;
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103 thred = thred->md.next;
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104 }
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105 notified->cv[index].notifyHead = cv->waitHead;
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106 cv->waitHead = cv->waitTail = NULL;
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107 cv->nwait = 0;
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108 } else {
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109 thred = cv->waitHead;
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110 i = notified->cv[index].times;
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111 while (thred != NULL && i > 0) {
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112 thred->md.inCVWaitQueue = PR_FALSE;
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113 thred = thred->md.next;
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114 i--;
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115 }
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116 notified->cv[index].notifyHead = cv->waitHead;
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117 cv->waitHead = thred;
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118 if (cv->waitHead == NULL) {
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119 cv->waitTail = NULL;
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120 } else {
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121 if (cv->waitHead->md.prev != NULL) {
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122 cv->waitHead->md.prev->md.next = NULL;
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123 cv->waitHead->md.prev = NULL;
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124 }
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125 }
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126 cv->nwait -= notified->cv[index].times - i;
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127 }
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128 }
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129 notified = notified->link;
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130 } while (NULL != notified);
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131
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132 if (waitThred) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
133 AddThreadToCVWaitQueueInternal(waitThred, waitCV);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
134 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
135
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
136 /* Release the lock before notifying */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
137 LeaveCriticalSection(&lock->mutex);
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 notified = &post; /* this is where we start */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
140 do {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
141 for (index = 0; index < notified->length; ++index) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
142 PRThread *thred;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
143 PRThread *next;
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 thred = notified->cv[index].notifyHead;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
146 while (thred != NULL) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
147 BOOL rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
148
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
149 next = thred->md.next;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
150 thred->md.prev = thred->md.next = NULL;
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 rv = ReleaseSemaphore(thred->md.blocked_sema, 1, NULL);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
153 PR_ASSERT(rv != 0);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
154 thred = next;
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 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
157 prev = notified;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
158 notified = notified->link;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
159 if (&post != prev) PR_DELETE(prev);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
160 } while (NULL != notified);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
161 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
162
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
163 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
164 * Notifies just get posted to the protecting mutex. The
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
165 * actual notification is done when the lock is released so that
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
166 * MP systems don't contend for a lock that they can't have.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
167 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
168 static void md_PostNotifyToCvar(_MDCVar *cvar, _MDLock *lock,
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
169 PRBool broadcast)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
170 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
171 PRIntn index = 0;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
172 _MDNotified *notified = &lock->notified;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
173
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
174 while (1) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
175 for (index = 0; index < notified->length; ++index) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
176 if (notified->cv[index].cv == cvar) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
177 if (broadcast) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
178 notified->cv[index].times = -1;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
179 } else if (-1 != notified->cv[index].times) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
180 notified->cv[index].times += 1;
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 return;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
183 }
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 /* if not full, enter new CV in this array */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
186 if (notified->length < _MD_CV_NOTIFIED_LENGTH) break;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
187
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
188 /* if there's no link, create an empty array and link it */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
189 if (NULL == notified->link) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
190 notified->link = PR_NEWZAP(_MDNotified);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
191 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
192
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
193 notified = notified->link;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
194 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
195
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
196 /* A brand new entry in the array */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
197 notified->cv[index].times = (broadcast) ? -1 : 1;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
198 notified->cv[index].cv = cvar;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
199 notified->length += 1;
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 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
203 * _PR_MD_NEW_CV() -- Creating new condition variable
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
204 * ... Solaris uses cond_init() in similar function.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
205 *
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
206 * returns: -1 on failure
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
207 * 0 when it succeeds.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
208 *
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
209 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
210 PRInt32
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
211 _PR_MD_NEW_CV(_MDCVar *cv)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
212 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
213 cv->magic = _MD_MAGIC_CV;
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 * The waitHead, waitTail, and nwait fields are zeroed
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
216 * when the PRCondVar structure is created.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
217 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
218 return 0;
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 void _PR_MD_FREE_CV(_MDCVar *cv)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
222 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
223 cv->magic = (PRUint32)-1;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
224 return;
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
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
227 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
228 * _PR_MD_WAIT_CV() -- Wait on condition variable
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 void _PR_MD_WAIT_CV(_MDCVar *cv, _MDLock *lock, PRIntervalTime timeout )
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
231 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
232 PRThread *thred = _PR_MD_CURRENT_THREAD();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
233 DWORD rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
234 DWORD msecs = (timeout == PR_INTERVAL_NO_TIMEOUT) ?
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
235 INFINITE : PR_IntervalToMilliseconds(timeout);
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 * If we have pending notifies, post them now.
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 (0 != lock->notified.length) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
241 md_UnlockAndPostNotifies(lock, thred, cv);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
242 } else {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
243 AddThreadToCVWaitQueueInternal(thred, cv);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
244 LeaveCriticalSection(&lock->mutex);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
245 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
246
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
247 /* Wait for notification or timeout; don't really care which */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
248 rv = WaitForSingleObject(thred->md.blocked_sema, msecs);
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 EnterCriticalSection(&(lock->mutex));
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 PR_ASSERT(rv != WAIT_ABANDONED);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
253 PR_ASSERT(rv != WAIT_FAILED);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
254 PR_ASSERT(rv != WAIT_OBJECT_0 || thred->md.inCVWaitQueue == PR_FALSE);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
255
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
256 if (rv == WAIT_TIMEOUT) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
257 if (thred->md.inCVWaitQueue) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
258 PR_ASSERT((cv->waitTail != NULL && cv->waitHead != NULL)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
259 || (cv->waitTail == NULL && cv->waitHead == NULL));
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
260 cv->nwait -= 1;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
261 thred->md.inCVWaitQueue = PR_FALSE;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
262 if (cv->waitHead == thred) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
263 cv->waitHead = thred->md.next;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
264 if (cv->waitHead == NULL) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
265 cv->waitTail = NULL;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
266 } else {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
267 cv->waitHead->md.prev = NULL;
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Andre Heinecke <andre.heinecke@intevation.de>
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268 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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269 } else {
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270 PR_ASSERT(thred->md.prev != NULL);
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271 thred->md.prev->md.next = thred->md.next;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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272 if (thred->md.next != NULL) {
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273 thred->md.next->md.prev = thred->md.prev;
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274 } else {
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275 PR_ASSERT(cv->waitTail == thred);
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276 cv->waitTail = thred->md.prev;
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277 }
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278 }
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279 thred->md.next = thred->md.prev = NULL;
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280 } else {
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Andre Heinecke <andre.heinecke@intevation.de>
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281 /*
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282 * This thread must have been notified, but the
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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283 * ReleaseSemaphore call happens after WaitForSingleObject
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284 * times out. Wait on the semaphore again to make it
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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285 * non-signaled. We assume this wait won't take long.
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Andre Heinecke <andre.heinecke@intevation.de>
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286 */
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287 rv = WaitForSingleObject(thred->md.blocked_sema, INFINITE);
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Andre Heinecke <andre.heinecke@intevation.de>
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288 PR_ASSERT(rv == WAIT_OBJECT_0);
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289 }
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290 }
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Andre Heinecke <andre.heinecke@intevation.de>
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291 PR_ASSERT(thred->md.inCVWaitQueue == PR_FALSE);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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292 return;
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293 } /* --- end _PR_MD_WAIT_CV() --- */
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294
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295 void _PR_MD_NOTIFY_CV(_MDCVar *cv, _MDLock *lock)
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Andre Heinecke <andre.heinecke@intevation.de>
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296 {
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297 md_PostNotifyToCvar(cv, lock, PR_FALSE);
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298 return;
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299 }
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300
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301 void _PR_MD_NOTIFYALL_CV(_MDCVar *cv, _MDLock *lock)
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302 {
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diff changeset
303 md_PostNotifyToCvar(cv, lock, PR_TRUE);
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Andre Heinecke <andre.heinecke@intevation.de>
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304 return;
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305 }
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Andre Heinecke <andre.heinecke@intevation.de>
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306
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307 typedef BOOL (WINAPI *INITIALIZECRITICALSECTIONEX)(
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308 CRITICAL_SECTION *lpCriticalSection,
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309 DWORD dwSpinCount,
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
310 DWORD Flags);
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311
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312 static INITIALIZECRITICALSECTIONEX sInitializeCriticalSectionEx;
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313
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314 void _PR_MD_INIT_LOCKS(void)
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Andre Heinecke <andre.heinecke@intevation.de>
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315 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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316 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
317 * Starting with Windows Vista, every CRITICAL_SECTION allocates an extra
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
318 * RTL_CRITICAL_SECTION_DEBUG object. Unfortunately, this debug object is
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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319 * not reclaimed by DeleteCriticalSection(), causing an apparent memory
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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parents:
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320 * leak. This is a debugging "feature", not a bug. If we are running on
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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321 * Vista or later, use InitializeCriticalSectionEx() to allocate
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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322 * CRITICAL_SECTIONs without debug objects.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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323 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
324 HMODULE hKernel32 = GetModuleHandle("kernel32.dll");
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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325 PR_ASSERT(hKernel32);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
326 PR_ASSERT(!sInitializeCriticalSectionEx);
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diff changeset
327 sInitializeCriticalSectionEx = (INITIALIZECRITICALSECTIONEX)
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diff changeset
328 GetProcAddress(hKernel32, "InitializeCriticalSectionEx");
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
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329 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
330
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Andre Heinecke <andre.heinecke@intevation.de>
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331 /*
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Andre Heinecke <andre.heinecke@intevation.de>
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332 * By default, CRITICAL_SECTIONs are initialized with a spin count of 0.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
333 * Joe Duffy's "Concurrent Programming on Windows" book suggests 1500 is
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
334 * a "reasonable starting point". On single-processor systems, the spin
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
335 * count is ignored and the critical section spin count is set to 0.
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
336 */
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Andre Heinecke <andre.heinecke@intevation.de>
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337 #define LOCK_SPIN_COUNT 1500
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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338
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Andre Heinecke <andre.heinecke@intevation.de>
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339 PRStatus _PR_MD_NEW_LOCK(_MDLock *lock)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
340 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
341 CRITICAL_SECTION *cs = &lock->mutex;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
342 BOOL ok;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
343
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
344 if (sInitializeCriticalSectionEx) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
345 ok = sInitializeCriticalSectionEx(cs, LOCK_SPIN_COUNT,
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
346 CRITICAL_SECTION_NO_DEBUG_INFO);
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diff changeset
347 } else {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
348 ok = InitializeCriticalSectionAndSpinCount(cs, LOCK_SPIN_COUNT);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
349 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
350 if (!ok) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
351 _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
352 return PR_FAILURE;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
353 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
354
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
355 lock->notified.length = 0;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
356 lock->notified.link = NULL;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
357 return PR_SUCCESS;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
358 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
359
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
360 void _PR_MD_UNLOCK(_MDLock *lock)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
361 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
362 if (0 != lock->notified.length) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
363 md_UnlockAndPostNotifies(lock, NULL, NULL);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
364 } else {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
365 LeaveCriticalSection(&lock->mutex);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
366 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
367 }
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