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relocatable-prog: Update documentation. * doc/relocatable-maint.texi (Supporting Relocation): Update to match the recent changes.
author Bruno Haible <bruno@clisp.org>
date Sun, 24 Feb 2019 01:49:15 +0100
parents b06060465f09
children
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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) 2009-2019 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, see <https://www.gnu.org/licenses/>. */
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18 /* Written by Paul Eggert and Glen Lenker. */
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19
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20 #if __GNUC__ >= 3
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21 @PRAGMA_SYSTEM_HEADER@
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22 #endif
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23 @PRAGMA_COLUMNS@
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24
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25 #if defined _GL_ALREADY_INCLUDING_PTHREAD_H
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26 /* Special invocation convention:
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27 On Android, we have a sequence of nested includes
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28 <pthread.h> -> <time.h> -> <sys/time.h> -> <sys/select.h> ->
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29 <signal.h> -> <pthread.h>.
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30 In this situation, PTHREAD_COND_INITIALIZER is not yet defined,
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31 therefore we should not attempt to define PTHREAD_MUTEX_NORMAL etc. */
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32
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33 #@INCLUDE_NEXT@ @NEXT_PTHREAD_H@
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34
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35 #else
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36 /* Normal invocation convention. */
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37
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38 #ifndef _@GUARD_PREFIX@_PTHREAD_H_
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39
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40 #if @HAVE_PTHREAD_H@
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41
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42 # define _GL_ALREADY_INCLUDING_PTHREAD_H
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43
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44 /* The include_next requires a split double-inclusion guard. */
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45 # @INCLUDE_NEXT@ @NEXT_PTHREAD_H@
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46
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47 # undef _GL_ALREADY_INCLUDING_PTHREAD_H
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48
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49 #endif
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50
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51 #ifndef _@GUARD_PREFIX@_PTHREAD_H_
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52 #define _@GUARD_PREFIX@_PTHREAD_H_
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53
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54 #define __need_system_stdlib_h
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55 #include <stdlib.h>
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56 #undef __need_system_stdlib_h
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57
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58
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59 /* The pthreads-win32 <pthread.h> defines a couple of broken macros. */
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60 #undef asctime_r
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61 #undef ctime_r
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62 #undef gmtime_r
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63 #undef localtime_r
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64 #undef rand_r
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65 #undef strtok_r
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66
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67 #include <errno.h>
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68 #include <sched.h>
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69 #include <sys/types.h>
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70 #include <time.h>
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71
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72 #ifndef _GL_INLINE_HEADER_BEGIN
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73 #error "Please include config.h first."
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74 #endif
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75 _GL_INLINE_HEADER_BEGIN
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76 #ifndef _GL_PTHREAD_INLINE
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77 # define _GL_PTHREAD_INLINE _GL_INLINE
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78 #endif
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79
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80 #if ! @HAVE_PTHREAD_T@
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81 # if !GNULIB_defined_pthread_types
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82 typedef int pthread_t;
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83 typedef int pthread_attr_t;
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84 typedef int pthread_barrier_t;
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85 typedef int pthread_barrierattr_t;
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86 typedef int pthread_cond_t;
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87 typedef int pthread_condattr_t;
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88 typedef int pthread_key_t;
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89 typedef int pthread_mutex_t;
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90 typedef int pthread_mutexattr_t;
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91 typedef int pthread_once_t;
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92 typedef int pthread_rwlock_t;
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93 typedef int pthread_rwlockattr_t;
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94 # define GNULIB_defined_pthread_types 1
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95 # endif
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96 #endif
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97
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98 #ifndef PTHREAD_COND_INITIALIZER
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99 #define PTHREAD_COND_INITIALIZER { 0 }
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100 #define PTHREAD_MUTEX_INITIALIZER { 0 }
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101 #define PTHREAD_ONCE_INIT { 0 }
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102 #define PTHREAD_RWLOCK_INITIALIZER { 0 }
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103
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104 #define PTHREAD_BARRIER_SERIAL_THREAD (-1)
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105
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106 #define PTHREAD_CANCEL_DEFERRED 0
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107 #define PTHREAD_CANCEL_ASYNCHRONOUS 1
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108
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109 #define PTHREAD_CANCEL_ENABLE 0
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110 #define PTHREAD_CANCEL_DISABLE 1
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111
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112 #define PTHREAD_CANCELED ((void *) -1)
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113
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114 #define PTHREAD_CREATE_JOINABLE 0
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115 #define PTHREAD_CREATE_DETACHED 1
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116
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117 #define PTHREAD_INHERIT_SCHED 0
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118 #define PTHREAD_EXPLICIT_SCHED 1
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119
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120 #define PTHREAD_MUTEX_DEFAULT PTHREAD_MUTEX_NORMAL
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121 #define PTHREAD_MUTEX_NORMAL 0
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122 #define PTHREAD_MUTEX_ERRORCHECK 1
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123 #define PTHREAD_MUTEX_RECURSIVE 2
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124
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125 #define PTHREAD_MUTEX_STALLED 0
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126 #define PTHREAD_MUTEX_ROBUST 1
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127
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128 #define PTHREAD_PRIO_NONE 0
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129 #define PTHREAD_PRIO_INHERIT 1
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130 #define PTHREAD_PRIO_PROTECT 2
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131
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132 #define PTHREAD_PROCESS_PRIVATE 0
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133 #define PTHREAD_PROCESS_SHARED 1
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134
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135 #define PTHREAD_SCOPE_SYSTEM 0
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136 #define PTHREAD_SCOPE_PROCESS 1
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137 #endif
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138
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139 #if ! @HAVE_PTHREAD_T@
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140
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141 # if !GNULIB_defined_pthread_functions
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142
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143 /* Provide substitutes for the thread functions that should work
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144 adequately on a single-threaded implementation, where
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145 pthread_create always fails. The goal is to let programs compile
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146 on non-pthread hosts with minimal runtime overhead.
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147
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148 Omit interfaces that have not been analyzed and for which we do not
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149 know what to do, so that they elicit a compile-time error for
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150 now. */
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151
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152 _GL_PTHREAD_INLINE int
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153 pthread_cond_destroy (pthread_cond_t *cond)
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154 {
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155 /* COND is never seriously used. */
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156 return 0;
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157 }
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158
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159 _GL_PTHREAD_INLINE int
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160 pthread_cond_init (pthread_cond_t *restrict cond,
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161 pthread_condattr_t const *restrict attr)
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162 {
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163 /* COND is never seriously used. */
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164 return 0;
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165 }
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166
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167 _GL_PTHREAD_INLINE int
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168 pthread_cond_signal (pthread_cond_t *cond)
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169 {
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170 /* No threads can currently be blocked on COND. */
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171 return 0;
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172 }
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173
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174 _GL_PTHREAD_INLINE int
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175 pthread_cond_wait (pthread_cond_t *restrict cond,
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176 pthread_mutex_t *restrict mutex)
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177 {
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178 /* Properly-written applications never come here. */
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179 abort ();
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180 return 0;
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181 }
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182
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183 _GL_PTHREAD_INLINE int
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184 pthread_create (pthread_t *restrict thread,
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185 pthread_attr_t const *restrict attr,
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186 void * (*start_routine) (void*), void *restrict arg)
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187 {
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188 /* Do not create a thread. */
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189 return EAGAIN;
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190 }
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191
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192 _GL_PTHREAD_INLINE void
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193 pthread_exit (void *value)
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194 {
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195 /* There is just one thread, so the process exits. */
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196 exit (0);
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197 }
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198
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199 _GL_PTHREAD_INLINE int
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200 pthread_join (pthread_t thread, void **pvalue)
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201 {
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202 /* Properly-written applications never come here. */
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203 abort ();
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204 return 0;
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205 }
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206
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207 _GL_PTHREAD_INLINE int
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208 pthread_mutexattr_destroy (pthread_mutexattr_t *attr)
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209 {
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210 return 0;
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211 }
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212
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213 _GL_PTHREAD_INLINE int
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214 pthread_mutexattr_init (pthread_mutexattr_t *attr)
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215 {
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216 return 0;
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217 }
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218
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219 _GL_PTHREAD_INLINE int
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220 pthread_mutexattr_settype (pthread_mutexattr_t *attr, int attr_type)
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221 {
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222 return 0;
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223 }
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224
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225 _GL_PTHREAD_INLINE int
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226 pthread_mutex_destroy (pthread_mutex_t *mutex)
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227 {
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228 /* MUTEX is never seriously used. */
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229 return 0;
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230 }
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231
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232 _GL_PTHREAD_INLINE int
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233 pthread_mutex_init (pthread_mutex_t *restrict mutex,
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234 pthread_mutexattr_t const *restrict attr)
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235 {
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236 /* MUTEX is never seriously used. */
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237 return 0;
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238 }
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239
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240 _GL_PTHREAD_INLINE int
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241 pthread_mutex_lock (pthread_mutex_t *mutex)
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242 {
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243 /* There is only one thread, so it always gets the lock. This
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244 implementation does not support PTHREAD_MUTEX_ERRORCHECK. */
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245 return 0;
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246 }
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247
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248 _GL_PTHREAD_INLINE int
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249 pthread_mutex_trylock (pthread_mutex_t *mutex)
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250 {
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251 return pthread_mutex_lock (mutex);
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252 }
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253
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254 _GL_PTHREAD_INLINE int
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255 pthread_mutex_unlock (pthread_mutex_t *mutex)
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256 {
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257 /* There is only one thread, so it always unlocks successfully.
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258 This implementation does not support robust mutexes or
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259 PTHREAD_MUTEX_ERRORCHECK. */
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260 return 0;
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261 }
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262
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263 # define GNULIB_defined_pthread_functions 1
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264 # endif
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265
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266 #endif
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267
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268 #if ! @HAVE_PTHREAD_SPINLOCK_T@
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269
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270 # if !GNULIB_defined_pthread_spinlock_t
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271
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272 /* Approximate spinlocks with mutexes. */
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273
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274 typedef pthread_mutex_t pthread_spinlock_t;
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275
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276 _GL_PTHREAD_INLINE int
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277 pthread_spin_init (pthread_spinlock_t *lock, int pshared)
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278 {
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279 return pthread_mutex_init (lock, NULL);
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280 }
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281
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282 _GL_PTHREAD_INLINE int
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283 pthread_spin_destroy (pthread_spinlock_t *lock)
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284 {
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285 return pthread_mutex_destroy (lock);
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286 }
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287
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288 _GL_PTHREAD_INLINE int
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289 pthread_spin_lock (pthread_spinlock_t *lock)
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290 {
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291 return pthread_mutex_lock (lock);
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292 }
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293
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294 _GL_PTHREAD_INLINE int
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295 pthread_spin_trylock (pthread_spinlock_t *lock)
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296 {
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297 return pthread_mutex_trylock (lock);
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298 }
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299
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300 _GL_PTHREAD_INLINE int
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301 pthread_spin_unlock (pthread_spinlock_t *lock)
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302 {
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303 return pthread_mutex_unlock (lock);
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304 }
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305
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306 # define GNULIB_defined_pthread_spinlock_t 1
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307 # endif
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308
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309 #endif
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310
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311 _GL_INLINE_HEADER_END
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312
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313 #endif /* _@GUARD_PREFIX@_PTHREAD_H_ */
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314 #endif /* _@GUARD_PREFIX@_PTHREAD_H_ */
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315 #endif