Mercurial > trustbridge > nss-cmake-static

annotate nss/lib/libpkix/pkix_pl_nss/system/pkix_pl_rwlock.c @ 0:1e5118fa0cb1

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This is NSS with a Cmake Buildsyste To compile a static NSS library for Windows we've used the Chromium-NSS fork and added a Cmake buildsystem to compile it statically for Windows. See README.chromium for chromium changes and README.trustbridge for our modifications.
author Andre Heinecke <andre.heinecke@intevation.de>
date Mon, 28 Jul 2014 10:47:06 +0200
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0
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1 /* This Source Code Form is subject to the terms of the Mozilla Public
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2 * License, v. 2.0. If a copy of the MPL was not distributed with this
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3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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4 /*
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5 * pkix_pl_rwlock.c
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6 *
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7 * Read/Write Lock Functions
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8 *
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9 */
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10
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11 #include "pkix_pl_rwlock.h"
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12
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13 /* --Private-Functions-------------------------------------------- */
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14
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15 static PKIX_Error *
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16 pkix_pl_RWLock_Destroy(
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17 PKIX_PL_Object *object,
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18 void *plContext)
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19 {
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20 PKIX_PL_RWLock* rwlock = NULL;
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21
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22 PKIX_ENTER(RWLOCK, "pkix_pl_RWLock_Destroy");
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23 PKIX_NULLCHECK_ONE(object);
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24
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25 PKIX_CHECK(pkix_CheckType(object, PKIX_RWLOCK_TYPE, plContext),
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26 PKIX_OBJECTNOTRWLOCK);
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27
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28 rwlock = (PKIX_PL_RWLock*) object;
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29
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30 PKIX_RWLOCK_DEBUG("Calling PR_DestroyRWLock)\n");
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31 PR_DestroyRWLock(rwlock->lock);
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32 rwlock->lock = NULL;
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33
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34 cleanup:
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35
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36 PKIX_RETURN(RWLOCK);
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37 }
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38
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39 /*
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40 * FUNCTION: pkix_pl_RWLock_RegisterSelf
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41 * DESCRIPTION:
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42 * Registers PKIX_RWLOCK_TYPE and its related functions with systemClasses[]
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43 * THREAD SAFETY:
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44 * Not Thread Safe - for performance and complexity reasons
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45 *
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46 * Since this function is only called by PKIX_PL_Initialize, which should
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47 * only be called once, it is acceptable that this function is not
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48 * thread-safe.
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49 */
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50 PKIX_Error *
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51 pkix_pl_RWLock_RegisterSelf(
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52 void *plContext)
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53 {
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54
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55 extern pkix_ClassTable_Entry systemClasses[PKIX_NUMTYPES];
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56 pkix_ClassTable_Entry entry;
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57
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58 PKIX_ENTER(RWLOCK, "pkix_pl_RWLock_RegisterSelf");
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59
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60 entry.description = "RWLock";
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61 entry.objCounter = 0;
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62 entry.typeObjectSize = sizeof(PKIX_PL_RWLock);
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63 entry.destructor = pkix_pl_RWLock_Destroy;
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64 entry.equalsFunction = NULL;
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65 entry.hashcodeFunction = NULL;
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66 entry.toStringFunction = NULL;
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67 entry.comparator = NULL;
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68 entry.duplicateFunction = NULL;
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69
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70 systemClasses[PKIX_RWLOCK_TYPE] = entry;
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71
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72 PKIX_RETURN(RWLOCK);
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73 }
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74
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75 /* --Public-Functions--------------------------------------------- */
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76
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77 PKIX_Error *
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78 PKIX_PL_RWLock_Create(
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79 PKIX_PL_RWLock **pNewLock,
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80 void *plContext)
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81 {
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82 PKIX_PL_RWLock *rwLock = NULL;
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83
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84 PKIX_ENTER(RWLOCK, "PKIX_PL_RWLock_Create");
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85 PKIX_NULLCHECK_ONE(pNewLock);
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86
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87 PKIX_CHECK(PKIX_PL_Object_Alloc
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88 (PKIX_RWLOCK_TYPE,
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89 sizeof (PKIX_PL_RWLock),
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90 (PKIX_PL_Object **)&rwLock,
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91 plContext),
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92 PKIX_ERRORALLOCATINGRWLOCK);
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93
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94 PKIX_RWLOCK_DEBUG("\tCalling PR_NewRWLock)\n");
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95 rwLock->lock = PR_NewRWLock(PR_RWLOCK_RANK_NONE, "PKIX RWLock");
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96
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97 if (rwLock->lock == NULL) {
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98 PKIX_DECREF(rwLock);
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99 PKIX_ERROR(PKIX_OUTOFMEMORY);
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100 }
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101
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102 rwLock->readCount = 0;
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103 rwLock->writeLocked = PKIX_FALSE;
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104
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105 *pNewLock = rwLock;
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106
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107 cleanup:
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108
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109 PKIX_RETURN(RWLOCK);
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110 }
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111
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112 PKIX_Error *
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113 PKIX_PL_AcquireReaderLock(
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114 PKIX_PL_RWLock *lock,
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115 void *plContext)
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116 {
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117 PKIX_ENTER(RWLOCK, "PKIX_PL_AcquireReaderLock");
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118 PKIX_NULLCHECK_ONE(lock);
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119
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120 PKIX_RWLOCK_DEBUG("\tCalling PR_RWLock_Rlock)\n");
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121 (void) PR_RWLock_Rlock(lock->lock);
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122
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123 lock->readCount++;
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124
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125 PKIX_RETURN(RWLOCK);
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126 }
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127
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128 PKIX_Error *
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129 PKIX_PL_ReleaseReaderLock(
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130 PKIX_PL_RWLock *lock,
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131 void *plContext)
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132 {
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133 PKIX_ENTER(RWLOCK, "PKIX_PL_ReleaseReaderLock");
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134 PKIX_NULLCHECK_ONE(lock);
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135
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136 PKIX_RWLOCK_DEBUG("\tCalling PR_RWLock_Unlock)\n");
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137 (void) PR_RWLock_Unlock(lock->lock);
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138
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139 lock->readCount--;
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140
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141 PKIX_RETURN(RWLOCK);
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142 }
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143
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144 PKIX_Error *
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145 PKIX_PL_IsReaderLockHeld(
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146 PKIX_PL_RWLock *lock,
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147 PKIX_Boolean *pIsHeld,
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148 void *plContext)
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149 {
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150 PKIX_ENTER(RWLOCK, "PKIX_PL_IsReaderLockHeld");
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151 PKIX_NULLCHECK_TWO(lock, pIsHeld);
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152
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153 *pIsHeld = (lock->readCount > 0)?PKIX_TRUE:PKIX_FALSE;
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154
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155 PKIX_RETURN(RWLOCK);
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156 }
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157
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158 PKIX_Error *
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159 PKIX_PL_AcquireWriterLock(
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160 PKIX_PL_RWLock *lock,
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161 void *plContext)
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162 {
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163 PKIX_ENTER(RWLOCK, "PKIX_PL_AcquireWriterLock");
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164 PKIX_NULLCHECK_ONE(lock);
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165
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166 PKIX_RWLOCK_DEBUG("\tCalling PR_RWLock_Wlock\n");
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167 (void) PR_RWLock_Wlock(lock->lock);
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168
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169 if (lock->readCount > 0) {
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170 PKIX_ERROR(PKIX_LOCKHASNONZEROREADCOUNT);
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171 }
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172
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173 /* We should never acquire a write lock if the lock is held */
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174 lock->writeLocked = PKIX_TRUE;
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175
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176 cleanup:
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177
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178 PKIX_RETURN(RWLOCK);
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179 }
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180
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181 PKIX_Error *
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182 PKIX_PL_ReleaseWriterLock(
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183 PKIX_PL_RWLock *lock,
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184 void *plContext)
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185 {
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186 PKIX_ENTER(RWLOCK, "PKIX_PL_ReleaseWriterLock");
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187 PKIX_NULLCHECK_ONE(lock);
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188
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189 if (lock->readCount > 0) {
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190 PKIX_ERROR(PKIX_LOCKHASNONZEROREADCOUNT);
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191 }
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192
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193 PKIX_RWLOCK_DEBUG("\tCalling PR_RWLock_Unlock)\n");
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194 (void) PR_RWLock_Unlock(lock->lock);
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195
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196 /* XXX Need to think about thread safety here */
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197 /* There should be a single lock holder */
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198 lock->writeLocked = PKIX_FALSE;
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199
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200 cleanup:
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201
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202 PKIX_RETURN(RWLOCK);
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203 }
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204
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205 PKIX_Error *
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206 PKIX_PL_IsWriterLockHeld(
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207 PKIX_PL_RWLock *lock,
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208 PKIX_Boolean *pIsHeld,
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209 void *plContext)
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210 {
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211 PKIX_ENTER(RWLOCK, "PKIX_PL_IsWriterLockHeld");
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212 PKIX_NULLCHECK_TWO(lock, pIsHeld);
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213
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214 *pIsHeld = lock->writeLocked;
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215
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216 PKIX_RETURN(RWLOCK);
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217 }
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