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annotate lib/pthread.in.h @ 13717:b747a553a8bb

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pthread: add to system <pthread.h> instead of replacing it all, for MacOS * lib/pthread.in.h: Add split double-inclusion guard, and include system <pthread.h> if there is one. Use @@-style as in other .in.h files. Define PTHREAD_COND_INITIALIZER etc. only if system pthread.h doesn't. (pthread_mutexattr_destroy, pthread_mutexattr_init): (pthread_mutexattr_settype, pthread_mutex_trylock): New static inline functions, if there's no system <pthread.h>. (pthread_spinlock_t, pthread_spin_init, pthread_spin_destroy): (pthread_spin_lock, pthread_spin_trylock, pthread_spin_unlock): Approximate with mutexes if the system lacks spinlocks, as in MacOS. * m4/pthread.m4 (gl_PTHREAD_CHECK): Require gl_PTHREAD_DEFAULTS. Add gl_CHECK_NEXT_HEADERS for pthread.h, and support the usual @@-style. Check for spinlocks separately. (gl_PTHREAD_DEFAULTS): New macro. * modules/pthread: Redo to use a more typical style for in.h files.
author Paul Eggert <eggert@cs.ucla.edu>
date Wed, 22 Sep 2010 01:32:19 -0700
parents b236a91e37b9
children a19ace3ba849
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1 /* Implement a trivial subset of POSIX 1003.1-2008 pthread.h.
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2
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3 Copyright (C) 2009, 2010 Free Software Foundation, Inc.
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4
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5 This program is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 2, or (at your option)
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8 any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software Foundation,
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17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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19 /* Written by Paul Eggert and Glen Lenker. */
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20
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21 #ifndef _GL_PTHREAD_H_
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22
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23 #if __GNUC__ >= 3
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24 @PRAGMA_SYSTEM_HEADER@
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25 #endif
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26
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27 /* The include_next requires a split double-inclusion guard. */
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28 #if @HAVE_PTHREAD_H@
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29 # @INCLUDE_NEXT@ @NEXT_PTHREAD_H@
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30 #endif
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31
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32 #ifndef _GL_PTHREAD_H_
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33 #define _GL_PTHREAD_H_
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34
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35 #include <errno.h>
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36 #include <stdlib.h>
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37 #include <sched.h>
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38 #include <sys/types.h>
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39 #include <time.h>
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41 #if ! @HAVE_PTHREAD_T@
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42 typedef int pthread_t;
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43 typedef int pthread_attr_t;
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44 typedef int pthread_barrier_t;
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45 typedef int pthread_barrierattr_t;
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46 typedef int pthread_cond_t;
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47 typedef int pthread_condattr_t;
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48 typedef int pthread_key_t;
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49 typedef int pthread_mutex_t;
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50 typedef int pthread_mutexattr_t;
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51 typedef int pthread_once_t;
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52 typedef int pthread_rwlock_t;
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53 typedef int pthread_rwlockattr_t;
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54 #endif
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55
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56 #ifndef PTHREAD_COND_INITIALIZER
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57 #define PTHREAD_COND_INITIALIZER { 0 }
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58 #define PTHREAD_MUTEX_INITIALIZER { 0 }
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59 #define PTHREAD_ONCE_INIT { 0 }
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60 #define PTHREAD_RWLOCK_INITIALIZER { 0 }
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61
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62 #define PTHREAD_BARRIER_SERIAL_THREAD (-1)
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63
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64 #define PTHREAD_CANCEL_DEFERRED 0
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65 #define PTHREAD_CANCEL_ASYNCHRONOUS 1
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66
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67 #define PTHREAD_CANCEL_ENABLE 0
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68 #define PTHREAD_CANCEL_DISABLE 1
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69
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70 #define PTHREAD_CANCELED ((void *) -1)
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71
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72 #define PTHREAD_CREATE_JOINABLE 0
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73 #define PTHREAD_CREATE_DETACHED 1
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74
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75 #define PTHREAD_INHERIT_SCHED 0
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76 #define PTHREAD_EXPLICIT_SCHED 1
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77
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78 #define PTHREAD_MUTEX_DEFAULT PTHREAD_MUTEX_NORMAL
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79 #define PTHREAD_MUTEX_NORMAL 0
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80 #define PTHREAD_MUTEX_ERRORCHECK 1
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81 #define PTHREAD_MUTEX_RECURSIVE 2
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82
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83 #define PTHREAD_MUTEX_STALLED 0
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84 #define PTHREAD_MUTEX_ROBUST 1
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85
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86 #define PTHREAD_PRIO_NONE 0
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87 #define PTHREAD_PRIO_INHERIT 1
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88 #define PTHREAD_PRIO_PROTECT 2
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89
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90 #define PTHREAD_PROCESS_PRIVATE 0
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91 #define PTHREAD_PROCESS_SHARED 1
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92
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93 #define PTHREAD_SCOPE_SYSTEM 0
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94 #define PTHREAD_SCOPE_PROCESS 1
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95 #endif
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96
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97 #if ! @HAVE_PTHREAD_T@
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98
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99 /* Provide substitutes for the thread functions that should work
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100 adequately on a single-threaded implementation, where
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101 pthread_create always fails. The goal is to let programs compile
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102 on non-pthread hosts with minimal runtime overhead.
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103
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104 Omit interfaces that have not been analyzed and for which we do not
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105 know what to do, so that they elicit a compile-time error for
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106 now. */
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107
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108 static inline int
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109 pthread_cond_destroy (pthread_cond_t *cond)
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110 {
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111 /* COND is never seriously used. */
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112 return 0;
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113 }
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114
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115 static inline int
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116 pthread_cond_init (pthread_cond_t *restrict cond,
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117 pthread_condattr_t const *restrict attr)
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118 {
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119 /* COND is never seriously used. */
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120 return 0;
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121 }
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parents:
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122
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123 static inline int
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124 pthread_cond_signal (pthread_cond_t *cond)
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125 {
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parents: 12559
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126 /* No threads can currently be blocked on COND. */
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127 return 0;
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128 }
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129
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130 static inline int
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131 pthread_cond_wait (pthread_cond_t *restrict cond,
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132 pthread_mutex_t *restrict mutex)
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133 {
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134 /* Properly-written applications never come here. */
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135 abort ();
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136 return 0;
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Paul R. Eggert <eggert@cs.ucla.edu>
parents: 12559
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137 }
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138
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139 static inline int
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140 pthread_create (pthread_t *restrict thread,
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141 pthread_attr_t const *restrict attr,
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142 void * (*start_routine) (void*), void *restrict arg)
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143 {
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144 /* Do not create a thread. */
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145 return EAGAIN;
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Paul R. Eggert <eggert@cs.ucla.edu>
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146 }
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147
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148 static inline void
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149 pthread_exit (void *value)
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150 {
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151 /* There is just one thread, so the process exits. */
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152 exit (0);
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153 }
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154
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Paul R. Eggert <eggert@cs.ucla.edu>
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155 static inline int
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156 pthread_join (pthread_t thread, void **pvalue)
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157 {
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158 /* Properly-written applications never come here. */
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159 abort ();
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160 return 0;
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161 }
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162
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163 static inline int
13717
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164 pthread_mutexattr_destroy (pthread_mutexattr_t *attr)
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165 {
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166 return 0;
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167 }
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diff changeset
168
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169 static inline int
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170 pthread_mutexattr_init (pthread_mutexattr_t *attr)
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171 {
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172 return 0;
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Paul Eggert <eggert@cs.ucla.edu>
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173 }
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
174
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175 static inline int
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176 pthread_mutexattr_settype (pthread_mutexattr_t *attr, int attr_type)
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177 {
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178 return 0;
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179 }
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180
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181 static inline int
13467
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182 pthread_mutex_destroy (pthread_mutex_t *mutex)
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183 {
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184 /* MUTEX is never seriously used. */
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185 return 0;
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186 }
4a2a6b0eadea New modules nproc, pthread.
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187
13467
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188 static inline int
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diff changeset
189 pthread_mutex_init (pthread_mutex_t *restrict mutex,
13479
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190 pthread_mutexattr_t const *restrict attr)
13467
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191 {
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192 /* MUTEX is never seriously used. */
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193 return 0;
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Paul R. Eggert <eggert@cs.ucla.edu>
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diff changeset
194 }
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diff changeset
195
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Paul R. Eggert <eggert@cs.ucla.edu>
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196 static inline int
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197 pthread_mutex_lock (pthread_mutex_t *mutex)
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198 {
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diff changeset
199 /* There is only one thread, so it always gets the lock. This
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parents: 12559
diff changeset
200 implementation does not support PTHREAD_MUTEX_ERRORCHECK. */
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201 return 0;
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Paul R. Eggert <eggert@cs.ucla.edu>
parents: 12559
diff changeset
202 }
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Paul R. Eggert <eggert@cs.ucla.edu>
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diff changeset
203
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Paul R. Eggert <eggert@cs.ucla.edu>
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diff changeset
204 static inline int
13717
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205 pthread_mutex_trylock (pthread_mutex_t *mutex)
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
206 {
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
207 return pthread_mutex_lock (mutex);
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
208 }
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Paul Eggert <eggert@cs.ucla.edu>
parents: 13706
diff changeset
209
b747a553a8bb pthread: add to system <pthread.h> instead of replacing it all, for MacOS
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
210 static inline int
13467
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diff changeset
211 pthread_mutex_unlock (pthread_mutex_t *mutex)
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Paul R. Eggert <eggert@cs.ucla.edu>
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diff changeset
212 {
b3e78c51aab6 pthread: Add enough so that coreutils/src/sort.c compiles.
Paul R. Eggert <eggert@cs.ucla.edu>
parents: 12559
diff changeset
213 /* There is only one thread, so it always unlocks successfully.
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Paul R. Eggert <eggert@cs.ucla.edu>
parents: 12559
diff changeset
214 This implementation does not support robust mutexes or
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Paul R. Eggert <eggert@cs.ucla.edu>
parents: 12559
diff changeset
215 PTHREAD_MUTEX_ERRORCHECK. */
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diff changeset
216 return 0;
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Paul R. Eggert <eggert@cs.ucla.edu>
parents: 12559
diff changeset
217 }
b3e78c51aab6 pthread: Add enough so that coreutils/src/sort.c compiles.
Paul R. Eggert <eggert@cs.ucla.edu>
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diff changeset
218
13717
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diff changeset
219 #endif
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diff changeset
220
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
221 #if ! @HAVE_PTHREAD_SPINLOCK_T@
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diff changeset
222
b747a553a8bb pthread: add to system <pthread.h> instead of replacing it all, for MacOS
Paul Eggert <eggert@cs.ucla.edu>
parents: 13706
diff changeset
223 /* Approximate spinlocks with mutexes. */
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Paul Eggert <eggert@cs.ucla.edu>
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224
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
225 typedef pthread_mutex_t pthread_spinlock_t;
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226
13467
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227 static inline int
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Paul R. Eggert <eggert@cs.ucla.edu>
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diff changeset
228 pthread_spin_init (pthread_spinlock_t *lock, int pshared)
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Paul R. Eggert <eggert@cs.ucla.edu>
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229 {
13717
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230 return pthread_mutex_init (lock, NULL);
13467
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diff changeset
231 }
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Paul R. Eggert <eggert@cs.ucla.edu>
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diff changeset
232
b3e78c51aab6 pthread: Add enough so that coreutils/src/sort.c compiles.
Paul R. Eggert <eggert@cs.ucla.edu>
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diff changeset
233 static inline int
13706
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diff changeset
234 pthread_spin_destroy (pthread_spinlock_t *lock)
b236a91e37b9 pthread: add pthread_spin_destroy
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diff changeset
235 {
13717
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236 return pthread_mutex_destroy (lock);
13706
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
237 }
b236a91e37b9 pthread: add pthread_spin_destroy
Paul Eggert <eggert@cs.ucla.edu>
parents: 13479
diff changeset
238
b236a91e37b9 pthread: add pthread_spin_destroy
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239 static inline int
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240 pthread_spin_lock (pthread_spinlock_t *lock)
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241 {
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242 return pthread_mutex_lock (lock);
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243 }
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244
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245 static inline int
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246 pthread_spin_trylock (pthread_spinlock_t *lock)
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247 {
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248 return pthread_mutex_trylock (lock);
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249 }
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250
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251 static inline int
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252 pthread_spin_unlock (pthread_spinlock_t *lock)
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253 {
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254 return pthread_mutex_unlock (lock);
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255 }
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256 #endif
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257
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258 #endif /* _GL_PTHREAD_H_ */
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259 #endif /* _GL_PTHREAD_H_ */