1 | /* Threads compatibility routines for libgcc2 and libobjc. */ |
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2 | /* Compile this one with gcc. */ |
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3 | /* Copyright (C) 1997, 1999, 2000, 2001 Free Software Foundation, Inc. |
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4 | |
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5 | This file is part of GCC. |
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6 | |
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7 | GCC is free software; you can redistribute it and/or modify it under |
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8 | the terms of the GNU General Public License as published by the Free |
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9 | Software Foundation; either version 2, or (at your option) any later |
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10 | version. |
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11 | |
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12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
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13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 | for more details. |
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16 | |
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17 | You should have received a copy of the GNU General Public License |
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18 | along with GCC; see the file COPYING. If not, write to the Free |
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19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
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20 | 02111-1307, USA. */ |
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21 | |
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22 | /* As a special exception, if you link this library with other files, |
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23 | some of which are compiled with GCC, to produce an executable, |
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24 | this library does not by itself cause the resulting executable |
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25 | to be covered by the GNU General Public License. |
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26 | This exception does not however invalidate any other reasons why |
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27 | the executable file might be covered by the GNU General Public License. */ |
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28 | |
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29 | #ifndef GCC_GTHR_POSIX_H |
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30 | #define GCC_GTHR_POSIX_H |
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31 | |
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32 | /* POSIX threads specific definitions. |
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33 | Easy, since the interface is just one-to-one mapping. */ |
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34 | |
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35 | #define __GTHREADS 1 |
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36 | |
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37 | #include <pthread.h> |
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38 | |
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39 | typedef pthread_key_t __gthread_key_t; |
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40 | typedef pthread_once_t __gthread_once_t; |
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41 | typedef pthread_mutex_t __gthread_mutex_t; |
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42 | |
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43 | #define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER |
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44 | #define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT |
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45 | |
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46 | #if SUPPORTS_WEAK && GTHREAD_USE_WEAK |
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47 | |
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48 | #pragma weak pthread_once |
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49 | #pragma weak pthread_key_create |
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50 | #pragma weak pthread_key_delete |
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51 | #pragma weak pthread_getspecific |
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52 | #pragma weak pthread_setspecific |
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53 | #pragma weak pthread_create |
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54 | |
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55 | #pragma weak pthread_mutex_lock |
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56 | #pragma weak pthread_mutex_trylock |
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57 | #pragma weak pthread_mutex_unlock |
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58 | |
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59 | #ifdef _LIBOBJC |
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60 | /* Objective C. */ |
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61 | #pragma weak pthread_cond_broadcast |
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62 | #pragma weak pthread_cond_destroy |
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63 | #pragma weak pthread_cond_init |
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64 | #pragma weak pthread_cond_signal |
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65 | #pragma weak pthread_cond_wait |
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66 | #pragma weak pthread_exit |
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67 | #pragma weak pthread_mutex_init |
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68 | #pragma weak pthread_mutex_destroy |
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69 | #pragma weak pthread_self |
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70 | #pragma weak sched_get_priority_max |
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71 | #pragma weak sched_get_priority_min |
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72 | #pragma weak sched_yield |
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73 | #pragma weak pthread_attr_destroy |
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74 | #pragma weak pthread_attr_init |
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75 | #pragma weak pthread_attr_setdetachstate |
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76 | #pragma weak pthread_getschedparam |
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77 | #pragma weak pthread_setschedparam |
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78 | #endif |
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79 | |
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80 | static inline int |
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81 | __gthread_active_p (void) |
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82 | { |
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83 | static void *const __gthread_active_ptr = (void *) &pthread_create; |
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84 | return __gthread_active_ptr != 0; |
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85 | } |
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86 | |
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87 | #else /* not SUPPORTS_WEAK */ |
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88 | |
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89 | static inline int |
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90 | __gthread_active_p (void) |
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91 | { |
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92 | return 1; |
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93 | } |
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94 | |
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95 | #endif /* SUPPORTS_WEAK */ |
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96 | |
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97 | #ifdef _LIBOBJC |
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98 | |
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99 | /* This is the config.h file in libobjc/ */ |
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100 | #include <config.h> |
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101 | |
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102 | #ifdef HAVE_SCHED_H |
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103 | # include <sched.h> |
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104 | #endif |
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105 | |
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106 | /* Key structure for maintaining thread specific storage */ |
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107 | static pthread_key_t _objc_thread_storage; |
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108 | static pthread_attr_t _objc_thread_attribs; |
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109 | |
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110 | /* Thread local storage for a single thread */ |
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111 | static void *thread_local_storage = NULL; |
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112 | |
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113 | /* Backend initialization functions */ |
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114 | |
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115 | /* Initialize the threads subsystem. */ |
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116 | static inline int |
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117 | __gthread_objc_init_thread_system(void) |
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118 | { |
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119 | if (__gthread_active_p ()) |
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120 | { |
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121 | /* Initialize the thread storage key */ |
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122 | if (pthread_key_create(&_objc_thread_storage, NULL) == 0) |
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123 | { |
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124 | /* The normal default detach state for threads is |
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125 | * PTHREAD_CREATE_JOINABLE which causes threads to not die |
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126 | * when you think they should. */ |
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127 | if (pthread_attr_init(&_objc_thread_attribs) == 0 |
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128 | && pthread_attr_setdetachstate(&_objc_thread_attribs, |
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129 | PTHREAD_CREATE_DETACHED) == 0) |
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130 | return 0; |
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131 | } |
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132 | } |
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133 | |
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134 | return -1; |
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135 | } |
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136 | |
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137 | /* Close the threads subsystem. */ |
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138 | static inline int |
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139 | __gthread_objc_close_thread_system(void) |
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140 | { |
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141 | if (__gthread_active_p () |
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142 | && pthread_key_delete(_objc_thread_storage) == 0 |
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143 | && pthread_attr_destroy(&_objc_thread_attribs) == 0) |
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144 | return 0; |
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145 | |
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146 | return -1; |
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147 | } |
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148 | |
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149 | /* Backend thread functions */ |
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150 | |
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151 | /* Create a new thread of execution. */ |
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152 | static inline objc_thread_t |
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153 | __gthread_objc_thread_detach(void (*func)(void *), void *arg) |
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154 | { |
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155 | objc_thread_t thread_id; |
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156 | pthread_t new_thread_handle; |
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157 | |
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158 | if (!__gthread_active_p ()) |
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159 | return NULL; |
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160 | |
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161 | if ( !(pthread_create(&new_thread_handle, NULL, (void *)func, arg)) ) |
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162 | thread_id = (objc_thread_t) new_thread_handle; |
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163 | else |
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164 | thread_id = NULL; |
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165 | |
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166 | return thread_id; |
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167 | } |
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168 | |
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169 | /* Set the current thread's priority. */ |
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170 | static inline int |
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171 | __gthread_objc_thread_set_priority(int priority) |
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172 | { |
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173 | if (!__gthread_active_p()) |
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174 | return -1; |
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175 | else { |
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176 | pthread_t thread_id = pthread_self(); |
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177 | int policy; |
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178 | struct sched_param params; |
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179 | int priority_min, priority_max; |
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180 | |
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181 | if (pthread_getschedparam(thread_id, &policy, ¶ms) == 0) |
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182 | { |
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183 | if ((priority_max = sched_get_priority_max(policy)) != 0) |
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184 | return -1; |
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185 | |
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186 | if ((priority_min = sched_get_priority_min(policy)) != 0) |
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187 | return -1; |
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188 | |
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189 | if (priority > priority_max) |
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190 | priority = priority_max; |
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191 | else if (priority < priority_min) |
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192 | priority = priority_min; |
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193 | params.sched_priority = priority; |
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194 | |
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195 | /* |
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196 | * The solaris 7 and several other man pages incorrectly state that |
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197 | * this should be a pointer to policy but pthread.h is universally |
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198 | * at odds with this. |
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199 | */ |
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200 | if (pthread_setschedparam(thread_id, policy, ¶ms) == 0) |
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201 | return 0; |
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202 | } |
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203 | return -1; |
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204 | } |
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205 | } |
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206 | |
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207 | /* Return the current thread's priority. */ |
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208 | static inline int |
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209 | __gthread_objc_thread_get_priority(void) |
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210 | { |
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211 | if (__gthread_active_p ()) |
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212 | { |
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213 | int policy; |
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214 | struct sched_param params; |
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215 | |
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216 | if (pthread_getschedparam(pthread_self(), &policy, ¶ms) == 0) |
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217 | return params.sched_priority; |
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218 | else |
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219 | return -1; |
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220 | } |
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221 | else |
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222 | return OBJC_THREAD_INTERACTIVE_PRIORITY; |
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223 | } |
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224 | |
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225 | /* Yield our process time to another thread. */ |
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226 | static inline void |
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227 | __gthread_objc_thread_yield(void) |
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228 | { |
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229 | if (__gthread_active_p ()) |
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230 | sched_yield(); |
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231 | } |
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232 | |
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233 | /* Terminate the current thread. */ |
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234 | static inline int |
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235 | __gthread_objc_thread_exit(void) |
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236 | { |
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237 | if (__gthread_active_p ()) |
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238 | /* exit the thread */ |
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239 | pthread_exit(&__objc_thread_exit_status); |
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240 | |
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241 | /* Failed if we reached here */ |
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242 | return -1; |
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243 | } |
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244 | |
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245 | /* Returns an integer value which uniquely describes a thread. */ |
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246 | static inline objc_thread_t |
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247 | __gthread_objc_thread_id(void) |
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248 | { |
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249 | if (__gthread_active_p ()) |
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250 | return (objc_thread_t) pthread_self(); |
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251 | else |
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252 | return (objc_thread_t) 1; |
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253 | } |
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254 | |
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255 | /* Sets the thread's local storage pointer. */ |
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256 | static inline int |
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257 | __gthread_objc_thread_set_data(void *value) |
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258 | { |
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259 | if (__gthread_active_p ()) |
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260 | return pthread_setspecific(_objc_thread_storage, value); |
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261 | else |
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262 | { |
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263 | thread_local_storage = value; |
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264 | return 0; |
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265 | } |
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266 | } |
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267 | |
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268 | /* Returns the thread's local storage pointer. */ |
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269 | static inline void * |
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270 | __gthread_objc_thread_get_data(void) |
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271 | { |
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272 | if (__gthread_active_p ()) |
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273 | return pthread_getspecific(_objc_thread_storage); |
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274 | else |
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275 | return thread_local_storage; |
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276 | } |
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277 | |
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278 | /* Backend mutex functions */ |
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279 | |
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280 | /* Allocate a mutex. */ |
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281 | static inline int |
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282 | __gthread_objc_mutex_allocate(objc_mutex_t mutex) |
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283 | { |
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284 | if (__gthread_active_p ()) |
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285 | { |
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286 | mutex->backend = objc_malloc(sizeof(pthread_mutex_t)); |
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287 | |
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288 | if (pthread_mutex_init((pthread_mutex_t *)mutex->backend, NULL)) |
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289 | { |
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290 | objc_free(mutex->backend); |
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291 | mutex->backend = NULL; |
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292 | return -1; |
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293 | } |
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294 | } |
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295 | |
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296 | return 0; |
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297 | } |
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298 | |
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299 | /* Deallocate a mutex. */ |
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300 | static inline int |
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301 | __gthread_objc_mutex_deallocate(objc_mutex_t mutex) |
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302 | { |
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303 | if (__gthread_active_p ()) |
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304 | { |
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305 | int count; |
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306 | |
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307 | /* |
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308 | * Posix Threads specifically require that the thread be unlocked |
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309 | * for pthread_mutex_destroy to work. |
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310 | */ |
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311 | |
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312 | do |
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313 | { |
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314 | count = pthread_mutex_unlock((pthread_mutex_t *)mutex->backend); |
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315 | if (count < 0) |
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316 | return -1; |
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317 | } |
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318 | while (count); |
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319 | |
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320 | if (pthread_mutex_destroy((pthread_mutex_t *)mutex->backend)) |
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321 | return -1; |
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322 | |
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323 | objc_free(mutex->backend); |
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324 | mutex->backend = NULL; |
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325 | } |
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326 | return 0; |
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327 | } |
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328 | |
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329 | /* Grab a lock on a mutex. */ |
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330 | static inline int |
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331 | __gthread_objc_mutex_lock(objc_mutex_t mutex) |
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332 | { |
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333 | if (__gthread_active_p () |
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334 | && pthread_mutex_lock((pthread_mutex_t *)mutex->backend) != 0) |
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335 | { |
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336 | return -1; |
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337 | } |
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338 | |
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339 | return 0; |
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340 | } |
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341 | |
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342 | /* Try to grab a lock on a mutex. */ |
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343 | static inline int |
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344 | __gthread_objc_mutex_trylock(objc_mutex_t mutex) |
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345 | { |
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346 | if (__gthread_active_p () |
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347 | && pthread_mutex_trylock((pthread_mutex_t *)mutex->backend) != 0) |
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348 | { |
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349 | return -1; |
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350 | } |
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351 | |
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352 | return 0; |
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353 | } |
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354 | |
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355 | /* Unlock the mutex */ |
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356 | static inline int |
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357 | __gthread_objc_mutex_unlock(objc_mutex_t mutex) |
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358 | { |
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359 | if (__gthread_active_p () |
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360 | && pthread_mutex_unlock((pthread_mutex_t *)mutex->backend) != 0) |
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361 | { |
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362 | return -1; |
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363 | } |
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364 | |
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365 | return 0; |
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366 | } |
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367 | |
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368 | /* Backend condition mutex functions */ |
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369 | |
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370 | /* Allocate a condition. */ |
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371 | static inline int |
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372 | __gthread_objc_condition_allocate(objc_condition_t condition) |
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373 | { |
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374 | if (__gthread_active_p ()) |
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375 | { |
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376 | condition->backend = objc_malloc(sizeof(pthread_cond_t)); |
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377 | |
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378 | if (pthread_cond_init((pthread_cond_t *)condition->backend, NULL)) |
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379 | { |
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380 | objc_free(condition->backend); |
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381 | condition->backend = NULL; |
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382 | return -1; |
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383 | } |
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384 | } |
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385 | |
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386 | return 0; |
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387 | } |
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388 | |
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389 | /* Deallocate a condition. */ |
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390 | static inline int |
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391 | __gthread_objc_condition_deallocate(objc_condition_t condition) |
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392 | { |
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393 | if (__gthread_active_p ()) |
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394 | { |
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395 | if (pthread_cond_destroy((pthread_cond_t *)condition->backend)) |
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396 | return -1; |
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397 | |
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398 | objc_free(condition->backend); |
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399 | condition->backend = NULL; |
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400 | } |
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401 | return 0; |
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402 | } |
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403 | |
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404 | /* Wait on the condition */ |
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405 | static inline int |
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406 | __gthread_objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex) |
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407 | { |
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408 | if (__gthread_active_p ()) |
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409 | return pthread_cond_wait((pthread_cond_t *)condition->backend, |
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410 | (pthread_mutex_t *)mutex->backend); |
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411 | else |
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412 | return 0; |
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413 | } |
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414 | |
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415 | /* Wake up all threads waiting on this condition. */ |
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416 | static inline int |
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417 | __gthread_objc_condition_broadcast(objc_condition_t condition) |
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418 | { |
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419 | if (__gthread_active_p ()) |
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420 | return pthread_cond_broadcast((pthread_cond_t *)condition->backend); |
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421 | else |
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422 | return 0; |
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423 | } |
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424 | |
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425 | /* Wake up one thread waiting on this condition. */ |
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426 | static inline int |
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427 | __gthread_objc_condition_signal(objc_condition_t condition) |
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428 | { |
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429 | if (__gthread_active_p ()) |
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430 | return pthread_cond_signal((pthread_cond_t *)condition->backend); |
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431 | else |
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432 | return 0; |
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433 | } |
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434 | |
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435 | #else /* _LIBOBJC */ |
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436 | |
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437 | static inline int |
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438 | __gthread_once (__gthread_once_t *once, void (*func) (void)) |
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439 | { |
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440 | if (__gthread_active_p ()) |
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441 | return pthread_once (once, func); |
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442 | else |
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443 | return -1; |
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444 | } |
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445 | |
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446 | static inline int |
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447 | __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *)) |
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448 | { |
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449 | return pthread_key_create (key, dtor); |
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450 | } |
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451 | |
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452 | static inline int |
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453 | __gthread_key_dtor (__gthread_key_t key, void *ptr) |
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454 | { |
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455 | /* Just reset the key value to zero. */ |
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456 | if (ptr) |
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457 | return pthread_setspecific (key, 0); |
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458 | else |
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459 | return 0; |
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460 | } |
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461 | |
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462 | static inline int |
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463 | __gthread_key_delete (__gthread_key_t key) |
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464 | { |
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465 | return pthread_key_delete (key); |
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466 | } |
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467 | |
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468 | static inline void * |
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469 | __gthread_getspecific (__gthread_key_t key) |
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470 | { |
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471 | return pthread_getspecific (key); |
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472 | } |
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473 | |
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474 | static inline int |
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475 | __gthread_setspecific (__gthread_key_t key, const void *ptr) |
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476 | { |
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477 | return pthread_setspecific (key, ptr); |
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478 | } |
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479 | |
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480 | static inline int |
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481 | __gthread_mutex_lock (__gthread_mutex_t *mutex) |
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482 | { |
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483 | if (__gthread_active_p ()) |
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484 | return pthread_mutex_lock (mutex); |
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485 | else |
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486 | return 0; |
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487 | } |
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488 | |
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489 | static inline int |
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490 | __gthread_mutex_trylock (__gthread_mutex_t *mutex) |
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491 | { |
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492 | if (__gthread_active_p ()) |
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493 | return pthread_mutex_trylock (mutex); |
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494 | else |
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495 | return 0; |
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496 | } |
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497 | |
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498 | static inline int |
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499 | __gthread_mutex_unlock (__gthread_mutex_t *mutex) |
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500 | { |
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501 | if (__gthread_active_p ()) |
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502 | return pthread_mutex_unlock (mutex); |
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503 | else |
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504 | return 0; |
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505 | } |
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506 | |
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507 | #endif /* _LIBOBJC */ |
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508 | |
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509 | #endif /* ! GCC_GTHR_POSIX_H */ |
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