1 | /* Basic platform-independent macro definitions for mutexes and |
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2 | thread-specific data. |
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3 | Copyright (C) 1996, 1997, 1998, 2000 Free Software Foundation, Inc. |
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4 | This file is part of the GNU C Library. |
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5 | Contributed by Wolfram Gloger <wmglo@dent.med.uni-muenchen.de>, 1996. |
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6 | |
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7 | The GNU C Library is free software; you can redistribute it and/or |
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8 | modify it under the terms of the GNU Lesser General Public |
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9 | License as published by the Free Software Foundation; either |
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10 | version 2.1 of the License, or (at your option) any later version. |
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11 | |
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12 | The GNU C Library is distributed in the hope that it will be useful, |
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13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | Lesser General Public License for more details. |
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16 | |
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17 | You should have received a copy of the GNU Lesser General Public |
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18 | License along with the GNU C Library; if not, write to the Free |
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19 | Software Foundation, Inc., 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 | /* $Id$ |
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23 | One out of _LIBC, USE_PTHREADS, USE_THR or USE_SPROC should be |
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24 | defined, otherwise the token NO_THREADS and dummy implementations |
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25 | of the macros will be defined. */ |
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26 | |
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27 | #ifndef _THREAD_M_H |
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28 | #define _THREAD_M_H |
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29 | |
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30 | #undef thread_atfork_static |
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31 | |
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32 | #if defined(_LIBC) /* The GNU C library, a special case of Posix threads */ |
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33 | |
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34 | #include <bits/libc-lock.h> |
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35 | |
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36 | #ifdef PTHREAD_MUTEX_INITIALIZER |
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37 | |
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38 | typedef pthread_t thread_id; |
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39 | |
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40 | /* mutex */ |
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41 | typedef pthread_mutex_t mutex_t; |
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42 | |
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43 | #define MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER |
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44 | |
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45 | /* Even if not linking with libpthread, ensure usability of mutex as |
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46 | an `in use' flag, see also the NO_THREADS case below. Assume |
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47 | pthread_mutex_t is at least one int wide. */ |
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48 | |
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49 | #define mutex_init(m) \ |
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50 | (__pthread_mutex_init != NULL \ |
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51 | ? __pthread_mutex_init (m, NULL) : (*(int *)(m) = 0)) |
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52 | #define mutex_lock(m) \ |
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53 | (__pthread_mutex_lock != NULL \ |
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54 | ? __pthread_mutex_lock (m) : ((*(int *)(m) = 1), 0)) |
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55 | #define mutex_trylock(m) \ |
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56 | (__pthread_mutex_trylock != NULL \ |
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57 | ? __pthread_mutex_trylock (m) : (*(int *)(m) ? 1 : ((*(int *)(m) = 1), 0))) |
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58 | #define mutex_unlock(m) \ |
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59 | (__pthread_mutex_unlock != NULL \ |
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60 | ? __pthread_mutex_unlock (m) : (*(int*)(m) = 0)) |
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61 | |
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62 | #define thread_atfork(prepare, parent, child) \ |
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63 | (__pthread_atfork != NULL ? __pthread_atfork(prepare, parent, child) : 0) |
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64 | |
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65 | #elif defined(MUTEX_INITIALIZER) |
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66 | /* Assume hurd, with cthreads */ |
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67 | |
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68 | /* Cthreads `mutex_t' is a pointer to a mutex, and malloc wants just the |
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69 | mutex itself. */ |
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70 | #undef mutex_t |
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71 | #define mutex_t struct mutex |
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72 | |
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73 | #undef mutex_init |
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74 | #define mutex_init(m) (__mutex_init(m), 0) |
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75 | |
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76 | #undef mutex_lock |
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77 | #define mutex_lock(m) (__mutex_lock(m), 0) |
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78 | |
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79 | #undef mutex_unlock |
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80 | #define mutex_unlock(m) (__mutex_unlock(m), 0) |
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81 | |
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82 | #define mutex_trylock(m) (!__mutex_trylock(m)) |
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83 | |
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84 | #define thread_atfork(prepare, parent, child) do {} while(0) |
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85 | #define thread_atfork_static(prepare, parent, child) \ |
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86 | text_set_element(_hurd_fork_prepare_hook, prepare); \ |
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87 | text_set_element(_hurd_fork_parent_hook, parent); \ |
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88 | text_set_element(_hurd_fork_child_hook, child); |
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89 | |
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90 | /* No we're *not* using pthreads. */ |
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91 | #define __pthread_initialize ((void (*)(void))0) |
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92 | |
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93 | #else |
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94 | |
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95 | #define NO_THREADS |
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96 | |
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97 | #endif /* MUTEX_INITIALIZER && PTHREAD_MUTEX_INITIALIZER */ |
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98 | |
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99 | #ifndef NO_THREADS |
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100 | |
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101 | /* thread specific data for glibc */ |
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102 | |
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103 | #include <libc-tsd.h> |
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104 | |
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105 | typedef int tsd_key_t[1]; /* no key data structure, libc magic does it */ |
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106 | __libc_tsd_define (, MALLOC) /* declaration/common definition */ |
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107 | #define tsd_key_create(key, destr) ((void) (key)) |
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108 | #define tsd_setspecific(key, data) __libc_tsd_set (MALLOC, (data)) |
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109 | #define tsd_getspecific(key, vptr) ((vptr) = __libc_tsd_get (MALLOC)) |
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110 | |
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111 | #endif |
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112 | |
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113 | #elif defined(USE_PTHREADS) /* Posix threads */ |
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114 | |
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115 | #include <pthread.h> |
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116 | |
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117 | typedef pthread_t thread_id; |
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118 | |
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119 | /* mutex */ |
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120 | typedef pthread_mutex_t mutex_t; |
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121 | |
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122 | #define MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER |
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123 | #define mutex_init(m) pthread_mutex_init(m, NULL) |
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124 | #define mutex_lock(m) pthread_mutex_lock(m) |
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125 | #define mutex_trylock(m) pthread_mutex_trylock(m) |
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126 | #define mutex_unlock(m) pthread_mutex_unlock(m) |
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127 | |
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128 | /* thread specific data */ |
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129 | #if defined(__sgi) || defined(USE_TSD_DATA_HACK) |
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130 | |
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131 | /* Hack for thread-specific data, e.g. on Irix 6.x. We can't use |
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132 | pthread_setspecific because that function calls malloc() itself. |
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133 | The hack only works when pthread_t can be converted to an integral |
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134 | type. */ |
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135 | |
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136 | typedef void *tsd_key_t[256]; |
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137 | #define tsd_key_create(key, destr) do { \ |
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138 | int i; \ |
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139 | for(i=0; i<256; i++) (*key)[i] = 0; \ |
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140 | } while(0) |
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141 | #define tsd_setspecific(key, data) \ |
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142 | (key[(unsigned)pthread_self() % 256] = (data)) |
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143 | #define tsd_getspecific(key, vptr) \ |
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144 | (vptr = key[(unsigned)pthread_self() % 256]) |
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145 | |
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146 | #else |
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147 | |
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148 | typedef pthread_key_t tsd_key_t; |
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149 | |
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150 | #define tsd_key_create(key, destr) pthread_key_create(key, destr) |
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151 | #define tsd_setspecific(key, data) pthread_setspecific(key, data) |
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152 | #define tsd_getspecific(key, vptr) (vptr = pthread_getspecific(key)) |
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153 | |
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154 | #endif |
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155 | |
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156 | /* at fork */ |
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157 | #define thread_atfork(prepare, parent, child) \ |
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158 | pthread_atfork(prepare, parent, child) |
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159 | |
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160 | #elif USE_THR /* Solaris threads */ |
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161 | |
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162 | #include <thread.h> |
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163 | |
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164 | typedef thread_t thread_id; |
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165 | |
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166 | #define MUTEX_INITIALIZER { 0 } |
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167 | #define mutex_init(m) mutex_init(m, USYNC_THREAD, NULL) |
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168 | |
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169 | /* |
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170 | * Hack for thread-specific data on Solaris. We can't use thr_setspecific |
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171 | * because that function calls malloc() itself. |
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172 | */ |
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173 | typedef void *tsd_key_t[256]; |
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174 | #define tsd_key_create(key, destr) do { \ |
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175 | int i; \ |
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176 | for(i=0; i<256; i++) (*key)[i] = 0; \ |
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177 | } while(0) |
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178 | #define tsd_setspecific(key, data) (key[(unsigned)thr_self() % 256] = (data)) |
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179 | #define tsd_getspecific(key, vptr) (vptr = key[(unsigned)thr_self() % 256]) |
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180 | |
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181 | #define thread_atfork(prepare, parent, child) do {} while(0) |
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182 | |
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183 | #elif USE_SPROC /* SGI sproc() threads */ |
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184 | |
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185 | #include <sys/wait.h> |
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186 | #include <sys/types.h> |
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187 | #include <sys/prctl.h> |
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188 | #include <abi_mutex.h> |
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189 | |
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190 | typedef int thread_id; |
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191 | |
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192 | typedef abilock_t mutex_t; |
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193 | |
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194 | #define MUTEX_INITIALIZER { 0 } |
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195 | #define mutex_init(m) init_lock(m) |
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196 | #define mutex_lock(m) (spin_lock(m), 0) |
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197 | #define mutex_trylock(m) acquire_lock(m) |
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198 | #define mutex_unlock(m) release_lock(m) |
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199 | |
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200 | typedef int tsd_key_t; |
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201 | int tsd_key_next; |
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202 | #define tsd_key_create(key, destr) ((*key) = tsd_key_next++) |
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203 | #define tsd_setspecific(key, data) (((void **)(&PRDA->usr_prda))[key] = data) |
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204 | #define tsd_getspecific(key, vptr) (vptr = ((void **)(&PRDA->usr_prda))[key]) |
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205 | |
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206 | #define thread_atfork(prepare, parent, child) do {} while(0) |
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207 | |
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208 | #else /* no _LIBC or USE_... are defined */ |
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209 | |
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210 | #define NO_THREADS |
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211 | |
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212 | #endif /* defined(_LIBC) */ |
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213 | |
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214 | #ifdef NO_THREADS /* No threads, provide dummy macros */ |
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215 | |
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216 | typedef int thread_id; |
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217 | |
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218 | /* The mutex functions used to do absolutely nothing, i.e. lock, |
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219 | trylock and unlock would always just return 0. However, even |
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220 | without any concurrently active threads, a mutex can be used |
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221 | legitimately as an `in use' flag. To make the code that is |
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222 | protected by a mutex async-signal safe, these macros would have to |
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223 | be based on atomic test-and-set operations, for example. */ |
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224 | typedef int mutex_t; |
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225 | |
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226 | #define MUTEX_INITIALIZER 0 |
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227 | #define mutex_init(m) (*(m) = 0) |
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228 | #define mutex_lock(m) ((*(m) = 1), 0) |
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229 | #define mutex_trylock(m) (*(m) ? 1 : ((*(m) = 1), 0)) |
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230 | #define mutex_unlock(m) (*(m) = 0) |
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231 | |
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232 | typedef void *tsd_key_t; |
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233 | #define tsd_key_create(key, destr) do {} while(0) |
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234 | #define tsd_setspecific(key, data) ((key) = (data)) |
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235 | #define tsd_getspecific(key, vptr) (vptr = (key)) |
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236 | |
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237 | #define thread_atfork(prepare, parent, child) do {} while(0) |
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238 | |
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239 | #endif /* defined(NO_THREADS) */ |
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240 | |
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241 | #endif /* !defined(_THREAD_M_H) */ |
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