Mercurial > trustbridge > nss-cmake-static

annotate nspr/pr/include/prolock.h @ 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
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 #ifndef prolock_h___
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7 #define prolock_h___
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8
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9 #include "prtypes.h"
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10
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11 PR_BEGIN_EXTERN_C
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12
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13 /*
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14 ** A locking mechanism, built on the existing PRLock definiion,
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15 ** is provided that will permit applications to define a Lock
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16 ** Hierarchy (or Lock Ordering) schema. An application designed
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17 ** using the Ordered Lock functions will terminate with a
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18 ** diagnostic message when a lock inversion condition is
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19 ** detected.
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20 **
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21 ** The lock ordering detection is complile-time enabled only. in
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22 ** optimized builds of NSPR, the Ordered Lock functions map
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23 ** directly to PRLock functions, providing no lock order
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24 ** detection.
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25 **
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26 ** The Ordered Lock Facility is compiled in when DEBUG is defined at
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27 ** compile time. Ordered Lock can be forced on in optimized builds by
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28 ** defining FORCE_NSPR_ORDERED_LOCK at compile time. Both the
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29 ** application using Ordered Lock and NSPR must be compiled with the
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30 ** facility enabled to achieve the desired results.
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31 **
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32 ** Application designers should use the macro interfaces to the Ordered
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33 ** Lock facility to ensure that it is compiled out in optimized builds.
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34 **
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35 ** Application designers are responsible for defining their own
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36 ** lock hierarchy.
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37 **
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38 ** Ordered Lock is thread-safe and SMP safe.
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39 **
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40 ** See Also: prlock.h
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41 **
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42 ** /lth. 10-Jun-1998.
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43 **
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44 */
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45
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46 /*
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47 ** Opaque type for ordered lock.
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48 ** ... Don't even think of looking in here.
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49 **
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50 */
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51
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52 #if defined(DEBUG) || defined(FORCE_NSPR_ORDERED_LOCKS)
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53 typedef void * PROrderedLock;
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54 #else
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55 /*
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56 ** Map PROrderedLock and methods onto PRLock when ordered locking
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57 ** is not compiled in.
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58 **
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59 */
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60 #include "prlock.h"
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61
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62 typedef PRLock PROrderedLock;
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63 #endif
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64
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65 /* -----------------------------------------------------------------------
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66 ** FUNCTION: PR_CreateOrderedLock() -- Create an Ordered Lock
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67 **
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68 ** DESCRIPTION: PR_CreateOrderedLock() creates an ordered lock.
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69 **
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70 ** INPUTS:
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71 ** order: user defined order of this lock.
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72 ** name: name of the lock. For debugging purposes.
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73 **
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74 ** OUTPUTS: returned
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75 **
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76 ** RETURNS: PR_OrderedLock pointer
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77 **
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78 ** RESTRICTIONS:
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79 **
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80 */
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81 #if defined(DEBUG) || defined(FORCE_NSPR_ORDERED_LOCKS)
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82 #define PR_CREATE_ORDERED_LOCK(order,name)\
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83 PR_CreateOrderedLock((order),(name))
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84 #else
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85 #define PR_CREATE_ORDERED_LOCK(order) PR_NewLock()
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86 #endif
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87
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88 NSPR_API(PROrderedLock *)
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89 PR_CreateOrderedLock(
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90 PRInt32 order,
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91 const char *name
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92 );
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93
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94 /* -----------------------------------------------------------------------
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95 ** FUNCTION: PR_DestroyOrderedLock() -- Destroy an Ordered Lock
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96 **
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97 ** DESCRIPTION: PR_DestroyOrderedLock() destroys the ordered lock
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98 ** referenced by lock.
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99 **
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100 ** INPUTS: lock: pointer to a PROrderedLock
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101 **
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102 ** OUTPUTS: the lock is destroyed
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103 **
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104 ** RETURNS: void
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105 **
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106 ** RESTRICTIONS:
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107 **
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108 */
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109 #if defined(DEBUG) || defined(FORCE_NSPR_ORDERED_LOCKS)
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110 #define PR_DESTROY_ORDERED_LOCK(lock) PR_DestroyOrderedLock((lock))
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111 #else
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112 #define PR_DESTROY_ORDERED_LOCK(lock) PR_DestroyLock((lock))
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113 #endif
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114
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115 NSPR_API(void)
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116 PR_DestroyOrderedLock(
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117 PROrderedLock *lock
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118 );
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119
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120 /* -----------------------------------------------------------------------
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121 ** FUNCTION: PR_LockOrderedLock() -- Lock an ordered lock
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122 **
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123 ** DESCRIPTION: PR_LockOrderedLock() locks the ordered lock
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124 ** referenced by lock. If the order of lock is less than or equal
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125 ** to the order of the highest lock held by the locking thread,
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126 ** the function asserts.
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127 **
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128 ** INPUTS: lock: a pointer to a PROrderedLock
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129 **
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130 ** OUTPUTS: The lock is held or the function asserts.
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131 **
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132 ** RETURNS: void
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133 **
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134 ** RESTRICTIONS:
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135 **
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136 */
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137 #if defined(DEBUG) || defined(FORCE_NSPR_ORDERED_LOCKS)
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138 #define PR_LOCK_ORDERED_LOCK(lock) PR_LockOrderedLock((lock))
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139 #else
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140 #define PR_LOCK_ORDERED_LOCK(lock) PR_Lock((lock))
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141 #endif
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142
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143 NSPR_API(void)
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144 PR_LockOrderedLock(
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145 PROrderedLock *lock
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146 );
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147
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148 /* -----------------------------------------------------------------------
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149 ** FUNCTION: PR_UnlockOrderedLock() -- unlock and Ordered Lock
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150 **
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151 ** DESCRIPTION: PR_UnlockOrderedLock() unlocks the lock referenced
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152 ** by lock.
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153 **
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154 ** INPUTS: lock: a pointer to a PROrderedLock
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155 **
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156 ** OUTPUTS: the lock is unlocked
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157 **
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158 ** RETURNS:
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159 ** PR_SUCCESS
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160 ** PR_FAILURE
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161 **
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162 ** RESTRICTIONS:
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163 **
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164 */
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165 #if defined(DEBUG) || defined(FORCE_NSPR_ORDERED_LOCKS)
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166 #define PR_UNLOCK_ORDERED_LOCK(lock) PR_UnlockOrderedLock((lock))
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167 #else
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168 #define PR_UNLOCK_ORDERED_LOCK(lock) PR_Unlock((lock))
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169 #endif
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170
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171 NSPR_API(PRStatus)
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172 PR_UnlockOrderedLock(
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173 PROrderedLock *lock
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174 );
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175
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176 PR_END_EXTERN_C
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177
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178 #endif /* prolock_h___ */
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