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annotate lib/glthread/tls.h @ 12559:c2cbabec01dd

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update nearly all FSF copyright year lists to include 2010 Use the same procedure as for 2009, outlined in http://thread.gmane.org/gmane.comp.lib.gnulib.bugs/20081
author Jim Meyering <meyering@redhat.com>
date Fri, 01 Jan 2010 10:31:12 +0100
parents b5e42ef33b49
children 97fc9a21a8fb
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1 /* Thread-local storage in multithreaded situations.
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2 Copyright (C) 2005, 2007-2010 Free Software Foundation, Inc.
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3
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4 This program is free software: you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 3 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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16
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17 /* Written by Bruno Haible <bruno@clisp.org>, 2005. */
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18
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19 /* This file contains thread-local storage primitives for use with a given
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20 thread library. It does not contain primitives for creating threads or
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21 for other multithreading primitives.
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22
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23 Type: gl_tls_key_t
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24 Initialization: gl_tls_key_init (name, destructor);
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25 Getting per-thread value: gl_tls_get (name)
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26 Setting per-thread value: gl_tls_set (name, pointer);
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27 De-initialization: gl_tls_key_destroy (name);
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28 Equivalent functions with control of error handling:
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29 Initialization: err = glthread_tls_key_init (&name, destructor);
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30 Setting per-thread value: err = glthread_tls_set (&name, pointer);
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31 De-initialization: err = glthread_tls_key_destroy (&name);
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32
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33 A per-thread value is of type 'void *'.
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34
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35 A destructor is a function pointer of type 'void (*) (void *)', called
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36 when a thread exits, and taking the last per-thread value as argument. It
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37 is unspecified whether the destructor function is called when the last
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38 per-thread value is NULL. On some platforms, the destructor function is
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39 not called at all.
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40 */
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41
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42
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43 #ifndef _TLS_H
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44 #define _TLS_H
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45
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46 #include <errno.h>
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47 #include <stdlib.h>
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48
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49 /* ========================================================================= */
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50
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51 #if USE_POSIX_THREADS
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52
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53 /* Use the POSIX threads library. */
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54
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55 # include <pthread.h>
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56
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57 # if PTHREAD_IN_USE_DETECTION_HARD
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58
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59 /* The pthread_in_use() detection needs to be done at runtime. */
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60 # define pthread_in_use() \
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61 glthread_in_use ()
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62 extern int glthread_in_use (void);
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63
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64 # endif
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65
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66 # if USE_POSIX_THREADS_WEAK
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67
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68 /* Use weak references to the POSIX threads library. */
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69
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70 # pragma weak pthread_key_create
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71 # pragma weak pthread_getspecific
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72 # pragma weak pthread_setspecific
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73 # pragma weak pthread_key_delete
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74 # ifndef pthread_self
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75 # pragma weak pthread_self
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76 # endif
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77
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78 # if !PTHREAD_IN_USE_DETECTION_HARD
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79 # pragma weak pthread_cancel
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80 # define pthread_in_use() (pthread_cancel != NULL)
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81 # endif
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82
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83 # else
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84
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85 # if !PTHREAD_IN_USE_DETECTION_HARD
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86 # define pthread_in_use() 1
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87 # endif
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88
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89 # endif
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90
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91 /* ------------------------- gl_tls_key_t datatype ------------------------- */
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92
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93 typedef union
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94 {
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95 void *singlethread_value;
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96 pthread_key_t key;
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97 }
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98 gl_tls_key_t;
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99 # define glthread_tls_key_init(KEY, DESTRUCTOR) \
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100 (pthread_in_use () \
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101 ? pthread_key_create (&(KEY)->key, DESTRUCTOR) \
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102 : ((KEY)->singlethread_value = NULL, 0))
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103 # define gl_tls_get(NAME) \
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104 (pthread_in_use () \
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105 ? pthread_getspecific ((NAME).key) \
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106 : (NAME).singlethread_value)
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107 # define glthread_tls_set(KEY, POINTER) \
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108 (pthread_in_use () \
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109 ? pthread_setspecific ((KEY)->key, (POINTER)) \
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110 : ((KEY)->singlethread_value = (POINTER), 0))
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111 # define glthread_tls_key_destroy(KEY) \
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112 (pthread_in_use () ? pthread_key_delete ((KEY)->key) : 0)
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113
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114 #endif
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115
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116 /* ========================================================================= */
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117
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118 #if USE_PTH_THREADS
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119
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120 /* Use the GNU Pth threads library. */
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121
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122 # include <pth.h>
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123
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124 # if USE_PTH_THREADS_WEAK
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125
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126 /* Use weak references to the GNU Pth threads library. */
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127
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128 # pragma weak pth_key_create
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129 # pragma weak pth_key_getdata
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130 # pragma weak pth_key_setdata
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131 # pragma weak pth_key_delete
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132
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133 # pragma weak pth_cancel
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134 # define pth_in_use() (pth_cancel != NULL)
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135
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136 # else
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137
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138 # define pth_in_use() 1
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139
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140 # endif
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141
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142 /* ------------------------- gl_tls_key_t datatype ------------------------- */
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143
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144 typedef union
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145 {
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146 void *singlethread_value;
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147 pth_key_t key;
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148 }
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149 gl_tls_key_t;
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150 # define glthread_tls_key_init(KEY, DESTRUCTOR) \
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151 (pth_in_use () \
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152 ? (!pth_key_create (&(KEY)->key, DESTRUCTOR) ? errno : 0) \
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153 : ((KEY)->singlethread_value = NULL, 0))
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154 # define gl_tls_get(NAME) \
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155 (pth_in_use () \
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156 ? pth_key_getdata ((NAME).key) \
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157 : (NAME).singlethread_value)
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158 # define glthread_tls_set(KEY, POINTER) \
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159 (pth_in_use () \
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160 ? (!pth_key_setdata ((KEY)->key, (POINTER)) ? errno : 0) \
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161 : ((KEY)->singlethread_value = (POINTER), 0))
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162 # define glthread_tls_key_destroy(KEY) \
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163 (pth_in_use () \
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164 ? (!pth_key_delete ((KEY)->key) ? errno : 0) \
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165 : 0)
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166
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167 #endif
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168
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169 /* ========================================================================= */
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170
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171 #if USE_SOLARIS_THREADS
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172
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173 /* Use the old Solaris threads library. */
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174
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175 # include <thread.h>
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176
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177 # if USE_SOLARIS_THREADS_WEAK
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178
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179 /* Use weak references to the old Solaris threads library. */
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180
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181 # pragma weak thr_keycreate
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182 # pragma weak thr_getspecific
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183 # pragma weak thr_setspecific
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184
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185 # pragma weak thr_suspend
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186 # define thread_in_use() (thr_suspend != NULL)
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187
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188 # else
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189
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190 # define thread_in_use() 1
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191
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192 # endif
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193
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194 /* ------------------------- gl_tls_key_t datatype ------------------------- */
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195
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196 typedef union
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197 {
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198 void *singlethread_value;
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199 thread_key_t key;
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200 }
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201 gl_tls_key_t;
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202 # define glthread_tls_key_init(KEY, DESTRUCTOR) \
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203 (thread_in_use () \
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204 ? thr_keycreate (&(KEY)->key, DESTRUCTOR) \
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205 : ((KEY)->singlethread_value = NULL, 0))
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206 # define gl_tls_get(NAME) \
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207 (thread_in_use () \
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208 ? glthread_tls_get_multithreaded ((NAME).key) \
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209 : (NAME).singlethread_value)
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210 extern void *glthread_tls_get_multithreaded (thread_key_t key);
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211 # define glthread_tls_set(KEY, POINTER) \
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212 (thread_in_use () \
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213 ? thr_setspecific ((KEY)->key, (POINTER)) \
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214 : ((KEY)->singlethread_value = (POINTER), 0))
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215 # define glthread_tls_key_destroy(KEY) \
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216 /* Unsupported. */ \
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217 0
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218
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219 #endif
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220
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221 /* ========================================================================= */
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222
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223 #if USE_WIN32_THREADS
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224
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225 # include <windows.h>
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226
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227 /* ------------------------- gl_tls_key_t datatype ------------------------- */
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228
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229 typedef DWORD gl_tls_key_t;
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230 # define glthread_tls_key_init(KEY, DESTRUCTOR) \
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231 /* The destructor is unsupported. */ \
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232 ((*(KEY) = TlsAlloc ()) == (DWORD)-1 ? EAGAIN : ((void) (DESTRUCTOR), 0))
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233 # define gl_tls_get(NAME) \
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234 TlsGetValue (NAME)
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235 # define glthread_tls_set(KEY, POINTER) \
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236 (!TlsSetValue (*(KEY), POINTER) ? EINVAL : 0)
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237 # define glthread_tls_key_destroy(KEY) \
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238 (!TlsFree (*(KEY)) ? EINVAL : 0)
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239
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240 #endif
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241
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242 /* ========================================================================= */
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243
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244 #if !(USE_POSIX_THREADS || USE_PTH_THREADS || USE_SOLARIS_THREADS || USE_WIN32_THREADS)
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245
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246 /* Provide dummy implementation if threads are not supported. */
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247
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248 /* ------------------------- gl_tls_key_t datatype ------------------------- */
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249
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250 typedef struct
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251 {
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252 void *singlethread_value;
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253 }
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254 gl_tls_key_t;
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255 # define glthread_tls_key_init(KEY, DESTRUCTOR) \
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256 ((KEY)->singlethread_value = NULL, \
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257 (void) (DESTRUCTOR), \
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258 0)
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259 # define gl_tls_get(NAME) \
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260 (NAME).singlethread_value
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261 # define glthread_tls_set(KEY, POINTER) \
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262 ((KEY)->singlethread_value = (POINTER), 0)
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263 # define glthread_tls_key_destroy(KEY) \
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264 0
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265
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266 #endif
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267
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268 /* ========================================================================= */
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269
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270 /* Macros with built-in error handling. */
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271
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272 /* ------------------------- gl_tls_key_t datatype ------------------------- */
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273
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274 #define gl_tls_key_init(NAME, DESTRUCTOR) \
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275 do \
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276 { \
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277 if (glthread_tls_key_init (&NAME, DESTRUCTOR)) \
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278 abort (); \
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279 } \
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280 while (0)
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281 #define gl_tls_set(NAME, POINTER) \
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282 do \
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283 { \
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284 if (glthread_tls_set (&NAME, POINTER)) \
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285 abort (); \
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286 } \
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287 while (0)
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288 #define gl_tls_key_destroy(NAME) \
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289 do \
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290 { \
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291 if (glthread_tls_key_destroy (&NAME)) \
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292 abort (); \
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293 } \
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294 while (0)
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295
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296 /* ========================================================================= */
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297
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298 #endif /* _TLS_H */