Mercurial > trustbridge > nss-cmake-static

annotate nspr/pr/src/threads/prtpd.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 ** Thread Private Data
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8 **
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9 ** There is an aribitrary limit on the number of keys that will be allocated
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10 ** by the runtime. It's largish, so it is intended to be a sanity check, not
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11 ** an impediment.
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12 **
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13 ** There is a counter, initialized to zero and incremented every time a
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14 ** client asks for a new key, that holds the high water mark for keys. All
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15 ** threads logically have the same high water mark and are permitted to
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16 ** ask for TPD up to that key value.
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17 **
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18 ** The vector to hold the TPD are allocated when PR_SetThreadPrivate() is
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19 ** called. The size of the vector will be some value greater than or equal
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20 ** to the current high water mark. Each thread has its own TPD length and
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21 ** vector.
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22 **
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23 ** Threads that get private data for keys they have not set (or perhaps
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24 ** don't even exist for that thread) get a NULL return. If the key is
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25 ** beyond the high water mark, an error will be returned.
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26 */
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27
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28 /*
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29 ** As of this time, BeOS has its own TPD implementation. Integrating
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30 ** this standard one is a TODO for anyone with a bit of spare time on
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31 ** their hand. For now, we just #ifdef out this whole file and use
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32 ** the routines in pr/src/btthreads/
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33 */
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34
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35 #ifndef XP_BEOS
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36
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37 #include "primpl.h"
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38
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39 #include <string.h>
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40
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41 #if defined(WIN95)
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42 /*
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43 ** Some local variables report warnings on Win95 because the code paths
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44 ** using them are conditioned on HAVE_CUSTOME_USER_THREADS.
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45 ** The pragma suppresses the warning.
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46 **
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47 */
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48 #pragma warning(disable : 4101)
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49 #endif
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50
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51 #define _PR_TPD_LIMIT 128 /* arbitary limit on the TPD slots */
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52 static PRInt32 _pr_tpd_length = 0; /* current length of destructor vector */
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53 static PRInt32 _pr_tpd_highwater = 0; /* next TPD key to be assigned */
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54 static PRThreadPrivateDTOR *_pr_tpd_destructors = NULL;
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55 /* the destructors are associated with
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56 the keys, therefore asserting that
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57 the TPD key depicts the data's 'type' */
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58
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59 /*
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60 ** Initialize the thread private data manipulation
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61 */
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62 void _PR_InitTPD(void)
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63 {
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64 _pr_tpd_destructors = (PRThreadPrivateDTOR*)
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65 PR_CALLOC(_PR_TPD_LIMIT * sizeof(PRThreadPrivateDTOR*));
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66 PR_ASSERT(NULL != _pr_tpd_destructors);
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67 _pr_tpd_length = _PR_TPD_LIMIT;
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68 }
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69
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70 /*
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71 ** Clean up the thread private data manipulation
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72 */
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73 void _PR_CleanupTPD(void)
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74 {
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75 } /* _PR_CleanupTPD */
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76
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77 /*
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78 ** This routine returns a new index for per-thread-private data table.
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79 ** The index is visible to all threads within a process. This index can
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80 ** be used with the PR_SetThreadPrivate() and PR_GetThreadPrivate() routines
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81 ** to save and retrieve data associated with the index for a thread.
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82 **
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83 ** The index independently maintains specific values for each binding thread.
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84 ** A thread can only get access to its own thread-specific-data.
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85 **
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86 ** Upon a new index return the value associated with the index for all threads
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87 ** is NULL, and upon thread creation the value associated with all indices for
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88 ** that thread is NULL.
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89 **
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90 ** "dtor" is the destructor function to invoke when the private
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91 ** data is set or destroyed
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92 **
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93 ** Returns PR_FAILURE if the total number of indices will exceed the maximun
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94 ** allowed.
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95 */
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96
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97 PR_IMPLEMENT(PRStatus) PR_NewThreadPrivateIndex(
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98 PRUintn *newIndex, PRThreadPrivateDTOR dtor)
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99 {
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100 PRStatus rv;
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101 PRInt32 index;
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102
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103 if (!_pr_initialized) _PR_ImplicitInitialization();
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104
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105 PR_ASSERT(NULL != newIndex);
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106 PR_ASSERT(NULL != _pr_tpd_destructors);
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107
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108 index = PR_ATOMIC_INCREMENT(&_pr_tpd_highwater) - 1; /* allocate index */
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109 if (_PR_TPD_LIMIT <= index)
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110 {
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111 PR_SetError(PR_TPD_RANGE_ERROR, 0);
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112 rv = PR_FAILURE; /* that's just wrong */
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113 }
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114 else
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115 {
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116 _pr_tpd_destructors[index] = dtor; /* record destructor @index */
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117 *newIndex = (PRUintn)index; /* copy into client's location */
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118 rv = PR_SUCCESS; /* that's okay */
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119 }
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120
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121 return rv;
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122 }
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123
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124 /*
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125 ** Define some per-thread-private data.
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126 ** "index" is an index into the per-thread private data table
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127 ** "priv" is the per-thread-private data
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128 **
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129 ** If the per-thread private data table has a previously registered
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130 ** destructor function and a non-NULL per-thread-private data value,
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131 ** the destructor function is invoked.
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132 **
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133 ** This can return PR_FAILURE if index is invalid (ie., beyond the current
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134 ** high water mark) or memory is insufficient to allocate an exanded vector.
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135 */
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136
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137 PR_IMPLEMENT(PRStatus) PR_SetThreadPrivate(PRUintn index, void *priv)
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138 {
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139 PRThread *self = PR_GetCurrentThread();
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140
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141 /*
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142 ** The index being set might not have a sufficient vector in this
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143 ** thread. But if the index has been allocated, it's okay to go
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144 ** ahead and extend this one now.
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145 */
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146 if ((index >= _PR_TPD_LIMIT) || (index >= _pr_tpd_highwater))
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147 {
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148 PR_SetError(PR_TPD_RANGE_ERROR, 0);
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149 return PR_FAILURE;
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150 }
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151
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152 PR_ASSERT(((NULL == self->privateData) && (0 == self->tpdLength))
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153 || ((NULL != self->privateData) && (0 != self->tpdLength)));
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154
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155 if ((NULL == self->privateData) || (self->tpdLength <= index))
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156 {
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157 void *extension = PR_CALLOC(_pr_tpd_length * sizeof(void*));
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158 if (NULL == extension)
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159 {
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160 PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
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161 return PR_FAILURE;
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162 }
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163 if (self->privateData) {
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164 (void)memcpy(
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165 extension, self->privateData,
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166 self->tpdLength * sizeof(void*));
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167 PR_DELETE(self->privateData);
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168 }
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169 self->tpdLength = _pr_tpd_length;
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170 self->privateData = (void**)extension;
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171 }
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172 /*
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173 ** There wasn't much chance of having to call the destructor
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174 ** unless the slot already existed.
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175 */
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176 else if (self->privateData[index] && _pr_tpd_destructors[index])
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177 {
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178 void *data = self->privateData[index];
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179 self->privateData[index] = NULL;
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180 (*_pr_tpd_destructors[index])(data);
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181 }
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182
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183 PR_ASSERT(index < self->tpdLength);
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184 self->privateData[index] = priv;
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185
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186 return PR_SUCCESS;
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187 }
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188
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189 /*
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190 ** Recover the per-thread-private data for the current thread. "index" is
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191 ** the index into the per-thread private data table.
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192 **
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193 ** The returned value may be NULL which is indistinguishable from an error
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194 ** condition.
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195 **
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196 */
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197
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198 PR_IMPLEMENT(void*) PR_GetThreadPrivate(PRUintn index)
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199 {
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200 PRThread *self = PR_GetCurrentThread();
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201 void *tpd = ((NULL == self->privateData) || (index >= self->tpdLength)) ?
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202 NULL : self->privateData[index];
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203
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204 return tpd;
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205 }
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206
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207 /*
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208 ** Destroy the thread's private data, if any exists. This is called at
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209 ** thread termination time only. There should be no threading issues
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210 ** since this is being called by the thread itself.
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211 */
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212 void _PR_DestroyThreadPrivate(PRThread* self)
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213 {
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214 #define _PR_TPD_DESTRUCTOR_ITERATIONS 4
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215
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216 if (NULL != self->privateData) /* we have some */
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217 {
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218 PRBool clean;
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219 PRUint32 index;
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220 PRInt32 passes = _PR_TPD_DESTRUCTOR_ITERATIONS;
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221 PR_ASSERT(0 != self->tpdLength);
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222 do
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223 {
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224 clean = PR_TRUE;
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225 for (index = 0; index < self->tpdLength; ++index)
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226 {
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227 void *priv = self->privateData[index]; /* extract */
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228 if (NULL != priv) /* we have data at this index */
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229 {
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230 if (NULL != _pr_tpd_destructors[index])
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231 {
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232 self->privateData[index] = NULL; /* precondition */
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233 (*_pr_tpd_destructors[index])(priv); /* destroy */
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234 clean = PR_FALSE; /* unknown side effects */
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235 }
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236 }
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237 }
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238 } while ((--passes > 0) && !clean); /* limit # of passes */
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239 /*
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240 ** We give up after a fixed number of passes. Any non-NULL
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241 ** thread-private data value with a registered destructor
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242 ** function is not destroyed.
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243 */
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244 memset(self->privateData, 0, self->tpdLength * sizeof(void*));
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245 }
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246 } /* _PR_DestroyThreadPrivate */
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247
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248 #endif /* !XP_BEOS */
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