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 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_SOLARIS_H |
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30 | #define GCC_GTHR_SOLARIS_H |
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31 | |
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32 | /* Solaris threads as found in Solaris 2.[456]. |
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33 | Actually these are Unix International (UI) threads, but I don't |
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34 | know if anyone else implements these. */ |
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35 | |
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36 | #define __GTHREADS 1 |
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37 | |
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38 | #include <thread.h> |
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39 | #include <errno.h> |
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40 | |
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41 | typedef thread_key_t __gthread_key_t; |
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42 | typedef struct |
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43 | { |
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44 | mutex_t mutex; |
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45 | int once; |
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46 | } __gthread_once_t; |
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47 | typedef mutex_t __gthread_mutex_t; |
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48 | |
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49 | #define __GTHREAD_ONCE_INIT { DEFAULTMUTEX, 0 } |
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50 | #define __GTHREAD_MUTEX_INIT DEFAULTMUTEX |
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51 | |
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52 | #if SUPPORTS_WEAK && GTHREAD_USE_WEAK |
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53 | |
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54 | #pragma weak thr_keycreate |
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55 | #pragma weak thr_getspecific |
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56 | #pragma weak thr_setspecific |
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57 | #pragma weak thr_create |
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58 | |
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59 | #pragma weak mutex_lock |
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60 | #pragma weak mutex_trylock |
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61 | #pragma weak mutex_unlock |
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62 | |
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63 | #ifdef _LIBOBJC |
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64 | #pragma weak thr_exit |
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65 | #pragma weak thr_keycreate |
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66 | #pragma weak thr_getprio |
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67 | #pragma weak thr_self |
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68 | #pragma weak thr_setprio |
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69 | #pragma weak thr_yield |
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70 | |
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71 | #pragma weak cond_init |
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72 | #pragma weak cond_destroy |
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73 | #pragma weak cond_wait |
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74 | #pragma weak cond_broadcast |
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75 | #pragma weak cond_signal |
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76 | |
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77 | #pragma weak mutex_init |
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78 | #pragma weak mutex_destroy |
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79 | #endif |
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80 | |
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81 | /* This will not actually work in Solaris 2.5, since libc contains |
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82 | dummy symbols of all thr_* routines. */ |
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83 | |
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84 | static inline int |
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85 | __gthread_active_p (void) |
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86 | { |
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87 | static void *const __gthread_active_ptr = (void *) &thr_create; |
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88 | return __gthread_active_ptr != 0; |
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89 | } |
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90 | |
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91 | #else /* not SUPPORTS_WEAK */ |
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92 | |
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93 | static inline int |
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94 | __gthread_active_p (void) |
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95 | { |
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96 | return 1; |
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97 | } |
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98 | |
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99 | #endif /* SUPPORTS_WEAK */ |
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100 | |
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101 | #ifdef _LIBOBJC |
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102 | |
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103 | /* Key structure for maintaining thread specific storage */ |
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104 | static thread_key_t _objc_thread_storage; |
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105 | |
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106 | /* Thread local storage for a single thread */ |
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107 | static void *thread_local_storage = NULL; |
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108 | |
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109 | /* Backend initialization functions */ |
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110 | |
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111 | /* Initialize the threads subsystem. */ |
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112 | static inline int |
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113 | __gthread_objc_init_thread_system(void) |
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114 | { |
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115 | /* Initialize the thread storage key */ |
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116 | if (__gthread_active_p () |
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117 | && thr_keycreate(&_objc_thread_storage, NULL) == 0) |
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118 | return 0; |
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119 | |
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120 | return -1; |
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121 | } |
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122 | |
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123 | /* Close the threads subsystem. */ |
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124 | static inline int |
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125 | __gthread_objc_close_thread_system(void) |
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126 | { |
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127 | if (__gthread_active_p ()) |
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128 | return 0; |
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129 | else |
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130 | return -1; |
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131 | } |
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132 | |
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133 | /* Backend thread functions */ |
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134 | |
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135 | /* Create a new thread of execution. */ |
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136 | static inline objc_thread_t |
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137 | __gthread_objc_thread_detach(void (*func)(void *), void *arg) |
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138 | { |
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139 | objc_thread_t thread_id; |
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140 | thread_t new_thread_id = 0; |
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141 | |
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142 | if (!__gthread_active_p ()) |
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143 | return NULL; |
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144 | |
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145 | if (thr_create(NULL, 0, (void *)func, arg, |
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146 | THR_DETACHED | THR_NEW_LWP, |
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147 | &new_thread_id) == 0) |
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148 | thread_id = *(objc_thread_t *)&new_thread_id; |
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149 | else |
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150 | thread_id = NULL; |
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151 | |
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152 | return thread_id; |
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153 | } |
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154 | |
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155 | /* Set the current thread's priority. */ |
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156 | static inline int |
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157 | __gthread_objc_thread_set_priority(int priority) |
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158 | { |
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159 | int sys_priority = 0; |
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160 | |
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161 | if (!__gthread_active_p ()) |
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162 | return -1; |
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163 | |
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164 | switch (priority) |
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165 | { |
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166 | case OBJC_THREAD_INTERACTIVE_PRIORITY: |
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167 | sys_priority = 300; |
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168 | break; |
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169 | default: |
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170 | case OBJC_THREAD_BACKGROUND_PRIORITY: |
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171 | sys_priority = 200; |
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172 | break; |
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173 | case OBJC_THREAD_LOW_PRIORITY: |
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174 | sys_priority = 1000; |
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175 | break; |
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176 | } |
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177 | |
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178 | /* Change priority */ |
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179 | if (thr_setprio(thr_self(), sys_priority) == 0) |
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180 | return 0; |
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181 | else |
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182 | return -1; |
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183 | } |
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184 | |
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185 | /* Return the current thread's priority. */ |
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186 | static inline int |
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187 | __gthread_objc_thread_get_priority(void) |
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188 | { |
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189 | int sys_priority; |
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190 | |
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191 | if (!__gthread_active_p ()) |
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192 | return OBJC_THREAD_INTERACTIVE_PRIORITY; |
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193 | |
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194 | if (thr_getprio(thr_self(), &sys_priority) == 0) |
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195 | { |
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196 | if (sys_priority >= 250) |
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197 | return OBJC_THREAD_INTERACTIVE_PRIORITY; |
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198 | else if (sys_priority >= 150) |
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199 | return OBJC_THREAD_BACKGROUND_PRIORITY; |
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200 | return OBJC_THREAD_LOW_PRIORITY; |
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201 | } |
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202 | |
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203 | /* Couldn't get priority. */ |
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204 | return -1; |
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205 | } |
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206 | |
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207 | /* Yield our process time to another thread. */ |
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208 | static inline void |
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209 | __gthread_objc_thread_yield(void) |
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210 | { |
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211 | if (__gthread_active_p ()) |
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212 | thr_yield(); |
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213 | } |
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214 | |
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215 | /* Terminate the current thread. */ |
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216 | static inline int |
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217 | __gthread_objc_thread_exit(void) |
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218 | { |
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219 | if (__gthread_active_p ()) |
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220 | /* exit the thread */ |
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221 | thr_exit(&__objc_thread_exit_status); |
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222 | |
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223 | /* Failed if we reached here */ |
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224 | return -1; |
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225 | } |
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226 | |
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227 | /* Returns an integer value which uniquely describes a thread. */ |
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228 | static inline objc_thread_t |
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229 | __gthread_objc_thread_id(void) |
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230 | { |
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231 | if (__gthread_active_p ()) |
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232 | return (objc_thread_t)thr_self(); |
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233 | else |
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234 | return (objc_thread_t)1; |
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235 | } |
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236 | |
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237 | /* Sets the thread's local storage pointer. */ |
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238 | static inline int |
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239 | __gthread_objc_thread_set_data(void *value) |
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240 | { |
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241 | if (__gthread_active_p ()) |
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242 | { |
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243 | if (thr_setspecific(_objc_thread_storage, value) == 0) |
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244 | return 0; |
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245 | else |
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246 | return -1; |
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247 | } |
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248 | else |
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249 | { |
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250 | thread_local_storage = value; |
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251 | return 0; |
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252 | } |
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253 | } |
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254 | |
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255 | /* Returns the thread's local storage pointer. */ |
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256 | static inline void * |
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257 | __gthread_objc_thread_get_data(void) |
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258 | { |
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259 | void *value = NULL; |
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260 | |
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261 | if (__gthread_active_p ()) |
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262 | { |
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263 | if (thr_getspecific(_objc_thread_storage, &value) == 0) |
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264 | return value; |
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265 | else |
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266 | return NULL; |
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267 | } |
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268 | else |
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269 | return thread_local_storage; |
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270 | } |
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271 | |
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272 | /* Backend mutex functions */ |
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273 | |
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274 | /* Allocate a mutex. */ |
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275 | static inline int |
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276 | __gthread_objc_mutex_allocate(objc_mutex_t mutex) |
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277 | { |
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278 | if (__gthread_active_p () |
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279 | && mutex_init( (mutex_t *)(&(mutex->backend)), USYNC_THREAD, 0)) |
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280 | return -1; |
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281 | |
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282 | return 0; |
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283 | } |
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284 | |
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285 | /* Deallocate a mutex. */ |
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286 | static inline int |
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287 | __gthread_objc_mutex_deallocate(objc_mutex_t mutex) |
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288 | { |
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289 | if (__gthread_active_p ()) |
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290 | mutex_destroy((mutex_t *)(&(mutex->backend))); |
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291 | |
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292 | return 0; |
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293 | } |
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294 | |
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295 | /* Grab a lock on a mutex. */ |
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296 | static inline int |
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297 | __gthread_objc_mutex_lock(objc_mutex_t mutex) |
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298 | { |
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299 | if (__gthread_active_p () |
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300 | && mutex_lock((mutex_t *)(&(mutex->backend))) != 0) |
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301 | return -1; |
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302 | |
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303 | return 0; |
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304 | } |
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305 | |
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306 | /* Try to grab a lock on a mutex. */ |
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307 | static inline int |
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308 | __gthread_objc_mutex_trylock(objc_mutex_t mutex) |
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309 | { |
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310 | if (__gthread_active_p () |
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311 | && mutex_trylock((mutex_t *)(&(mutex->backend))) != 0) |
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312 | return -1; |
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313 | |
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314 | return 0; |
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315 | } |
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316 | |
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317 | /* Unlock the mutex */ |
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318 | static inline int |
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319 | __gthread_objc_mutex_unlock(objc_mutex_t mutex) |
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320 | { |
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321 | if (__gthread_active_p () |
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322 | && mutex_unlock((mutex_t *)(&(mutex->backend))) != 0) |
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323 | return -1; |
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324 | |
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325 | return 0; |
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326 | } |
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327 | |
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328 | /* Backend condition mutex functions */ |
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329 | |
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330 | /* Allocate a condition. */ |
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331 | static inline int |
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332 | __gthread_objc_condition_allocate(objc_condition_t condition) |
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333 | { |
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334 | if (__gthread_active_p ()) |
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335 | return cond_init((cond_t *)(&(condition->backend)), USYNC_THREAD, |
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336 | NULL); |
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337 | else |
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338 | return 0; |
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339 | } |
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340 | |
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341 | /* Deallocate a condition. */ |
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342 | static inline int |
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343 | __gthread_objc_condition_deallocate(objc_condition_t condition) |
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344 | { |
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345 | if (__gthread_active_p ()) |
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346 | return cond_destroy((cond_t *)(&(condition->backend))); |
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347 | else |
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348 | return 0; |
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349 | } |
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350 | |
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351 | /* Wait on the condition */ |
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352 | static inline int |
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353 | __gthread_objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex) |
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354 | { |
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355 | if (__gthread_active_p ()) |
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356 | return cond_wait((cond_t *)(&(condition->backend)), |
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357 | (mutex_t *)(&(mutex->backend))); |
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358 | else |
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359 | return 0; |
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360 | } |
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361 | |
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362 | /* Wake up all threads waiting on this condition. */ |
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363 | static inline int |
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364 | __gthread_objc_condition_broadcast(objc_condition_t condition) |
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365 | { |
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366 | if (__gthread_active_p ()) |
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367 | return cond_broadcast((cond_t *)(&(condition->backend))); |
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368 | else |
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369 | return 0; |
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370 | } |
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371 | |
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372 | /* Wake up one thread waiting on this condition. */ |
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373 | static inline int |
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374 | __gthread_objc_condition_signal(objc_condition_t condition) |
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375 | { |
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376 | if (__gthread_active_p ()) |
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377 | return cond_signal((cond_t *)(&(condition->backend))); |
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378 | else |
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379 | return 0; |
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380 | } |
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381 | |
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382 | #else /* _LIBOBJC */ |
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383 | |
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384 | static inline int |
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385 | __gthread_once (__gthread_once_t *once, void (*func) (void)) |
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386 | { |
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387 | if (! __gthread_active_p ()) |
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388 | return -1; |
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389 | |
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390 | if (once == 0 || func == 0) |
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391 | return EINVAL; |
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392 | |
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393 | if (once->once == 0) |
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394 | { |
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395 | int status = mutex_lock (&once->mutex); |
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396 | if (status != 0) |
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397 | return status; |
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398 | if (once->once == 0) |
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399 | { |
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400 | (*func) (); |
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401 | once->once ++; |
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402 | } |
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403 | mutex_unlock (&once->mutex); |
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404 | } |
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405 | return 0; |
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406 | } |
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407 | |
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408 | static inline int |
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409 | __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *)) |
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410 | { |
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411 | /* Solaris 2.5 contains thr_* routines no-op in libc, so test if we actually |
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412 | got a reasonable key value, and if not, fail. */ |
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413 | *key = -1; |
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414 | if (thr_keycreate (key, dtor) != 0 || *key == -1) |
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415 | return -1; |
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416 | else |
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417 | return 0; |
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418 | } |
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419 | |
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420 | static inline int |
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421 | __gthread_key_dtor (__gthread_key_t key, void *ptr) |
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422 | { |
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423 | /* Nothing needed. */ |
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424 | return 0; |
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425 | } |
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426 | |
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427 | static inline int |
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428 | __gthread_key_delete (__gthread_key_t key) |
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429 | { |
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430 | /* Not possible. */ |
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431 | return -1; |
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432 | } |
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433 | |
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434 | static inline void * |
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435 | __gthread_getspecific (__gthread_key_t key) |
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436 | { |
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437 | void *ptr; |
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438 | if (thr_getspecific (key, &ptr) == 0) |
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439 | return ptr; |
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440 | else |
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441 | return 0; |
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442 | } |
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443 | |
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444 | static inline int |
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445 | __gthread_setspecific (__gthread_key_t key, const void *ptr) |
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446 | { |
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447 | return thr_setspecific (key, (void *) ptr); |
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448 | } |
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449 | |
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450 | static inline int |
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451 | __gthread_mutex_lock (__gthread_mutex_t *mutex) |
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452 | { |
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453 | if (__gthread_active_p ()) |
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454 | return mutex_lock (mutex); |
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455 | else |
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456 | return 0; |
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457 | } |
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458 | |
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459 | static inline int |
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460 | __gthread_mutex_trylock (__gthread_mutex_t *mutex) |
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461 | { |
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462 | if (__gthread_active_p ()) |
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463 | return mutex_trylock (mutex); |
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464 | else |
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465 | return 0; |
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466 | } |
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467 | |
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468 | static inline int |
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469 | __gthread_mutex_unlock (__gthread_mutex_t *mutex) |
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470 | { |
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471 | if (__gthread_active_p ()) |
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472 | return mutex_unlock (mutex); |
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473 | else |
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474 | return 0; |
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475 | } |
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476 | |
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477 | #endif /* _LIBOBJC */ |
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478 | |
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479 | #endif /* ! GCC_GTHR_SOLARIS_H */ |
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