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annotate Python/thread_pthread.h @ 12570:3dbe41380266 legacy-trunk

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Brian Hooper <brian_takashi@hotmail.com>: Added 'u' and 'u#' tags for PyArg_ParseTuple - these turn a PyUnicodeObject argument into a Py_UNICODE * buffer, or a Py_UNICODE * buffer plus a length with the '#'. Also added an analog to 'U' for Py_BuildValue.
author Fred Drake <fdrake@acm.org>
date Wed, 03 May 2000 15:17:02 +0000
parents 94ad90fd2712
children ff243b0f16ee
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 ******************************************************************/
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31
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32 /* Posix threads interface */
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33
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34 #include <stdlib.h>
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35 #include <string.h>
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36 #include <pthread.h>
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37
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38
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39 /* try to determine what version of the Pthread Standard is installed.
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40 * this is important, since all sorts of parameter types changed from
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41 * draft to draft and there are several (incompatible) drafts in
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42 * common use. these macros are a start, at least.
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43 * 12 May 1997 -- david arnold <davida@pobox.com>
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44 */
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45
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46 #if defined(__ultrix) && defined(__mips) && defined(_DECTHREADS_)
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47 /* _DECTHREADS_ is defined in cma.h which is included by pthread.h */
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48 # define PY_PTHREAD_D4
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49
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50 #elif defined(__osf__) && defined (__alpha)
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51 /* _DECTHREADS_ is defined in cma.h which is included by pthread.h */
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52 # if !defined(_PTHREAD_ENV_ALPHA) || defined(_PTHREAD_USE_D4) || defined(PTHREAD_USE_D4)
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53 # define PY_PTHREAD_D4
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54 # else
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55 # define PY_PTHREAD_STD
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56 # endif
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57
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58 #elif defined(_AIX)
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59 /* SCHED_BG_NP is defined if using AIX DCE pthreads
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60 * but it is unsupported by AIX 4 pthreads. Default
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61 * attributes for AIX 4 pthreads equal to NULL. For
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62 * AIX DCE pthreads they should be left unchanged.
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63 */
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64 # if !defined(SCHED_BG_NP)
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65 # define PY_PTHREAD_STD
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66 # else
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67 # define PY_PTHREAD_D7
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68 # endif
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69
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70 #elif defined(__DGUX)
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71 # define PY_PTHREAD_D6
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72
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73 #elif defined(__hpux) && defined(_DECTHREADS_)
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74 # define PY_PTHREAD_D4
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75
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76 #else /* Default case */
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77 # define PY_PTHREAD_STD
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78
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79 #endif
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80
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81
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82 /* set default attribute object for different versions */
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83
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84 #if defined(PY_PTHREAD_D4) || defined(PY_PTHREAD_D7)
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85 # define pthread_attr_default pthread_attr_default
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86 # define pthread_mutexattr_default pthread_mutexattr_default
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87 # define pthread_condattr_default pthread_condattr_default
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88 #elif defined(PY_PTHREAD_STD) || defined(PY_PTHREAD_D6)
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89 # define pthread_attr_default ((pthread_attr_t *)NULL)
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90 # define pthread_mutexattr_default ((pthread_mutexattr_t *)NULL)
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91 # define pthread_condattr_default ((pthread_condattr_t *)NULL)
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92 #endif
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93
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94
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95 /* A pthread mutex isn't sufficient to model the Python lock type
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96 * because, according to Draft 5 of the docs (P1003.4a/D5), both of the
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97 * following are undefined:
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98 * -> a thread tries to lock a mutex it already has locked
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99 * -> a thread tries to unlock a mutex locked by a different thread
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100 * pthread mutexes are designed for serializing threads over short pieces
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101 * of code anyway, so wouldn't be an appropriate implementation of
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102 * Python's locks regardless.
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103 *
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104 * The pthread_lock struct implements a Python lock as a "locked?" bit
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105 * and a <condition, mutex> pair. In general, if the bit can be acquired
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106 * instantly, it is, else the pair is used to block the thread until the
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107 * bit is cleared. 9 May 1994 tim@ksr.com
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108 */
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109
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110 typedef struct {
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111 char locked; /* 0=unlocked, 1=locked */
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112 /* a <cond, mutex> pair to handle an acquire of a locked lock */
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113 pthread_cond_t lock_released;
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114 pthread_mutex_t mut;
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115 } pthread_lock;
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116
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117 #define CHECK_STATUS(name) if (status != 0) { perror(name); error = 1; }
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118
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119 /*
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120 * Initialization.
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121 */
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122
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123 #ifdef _HAVE_BSDI
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124 static void _noop()
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125 {
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126 }
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127
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128 static void PyThread__init_thread _P0()
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129 {
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130 /* DO AN INIT BY STARTING THE THREAD */
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131 static int dummy = 0;
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132 pthread_t thread1;
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133 pthread_create(&thread1, NULL, (void *) _noop, &dummy);
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134 pthread_join(thread1, NULL);
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135 }
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136
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137 #else /* !_HAVE_BSDI */
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138
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139 static void PyThread__init_thread _P0()
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140 {
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141 #if defined(_AIX) && defined(__GNUC__)
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142 pthread_init();
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143 #endif
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144 }
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145
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146 #endif /* !_HAVE_BSDI */
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147
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148 /*
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149 * Thread support.
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150 */
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151
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152
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153 int PyThread_start_new_thread _P2(func, void (*func) _P((void *)), arg, void *arg)
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154 {
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155 pthread_t th;
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156 int success;
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157 dprintf(("PyThread_start_new_thread called\n"));
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158 if (!initialized)
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159 PyThread_init_thread();
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160
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161 success = pthread_create(&th,
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162 #if defined(PY_PTHREAD_D4)
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163 pthread_attr_default,
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164 (pthread_startroutine_t)func,
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165 (pthread_addr_t)arg
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166 #elif defined(PY_PTHREAD_D6)
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167 pthread_attr_default,
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168 (void* (*)_P((void *)))func,
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169 arg
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170 #elif defined(PY_PTHREAD_D7)
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171 pthread_attr_default,
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172 func,
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173 arg
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174 #elif defined(PY_PTHREAD_STD)
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175 (pthread_attr_t*)NULL,
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176 (void* (*)_P((void *)))func,
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177 (void *)arg
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178 #endif
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179 );
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180
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181 if (success == 0) {
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182 #if defined(PY_PTHREAD_D4) || defined(PY_PTHREAD_D6) || defined(PY_PTHREAD_D7)
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183 pthread_detach(&th);
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184 #elif defined(PY_PTHREAD_STD)
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185 pthread_detach(th);
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186 #endif
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187 }
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188 return success != 0 ? 0 : 1;
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189 }
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190
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191 long PyThread_get_thread_ident _P0()
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192 {
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193 volatile pthread_t threadid;
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194 if (!initialized)
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195 PyThread_init_thread();
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196 /* Jump through some hoops for Alpha OSF/1 */
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197 threadid = pthread_self();
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198 return (long) *(long *) &threadid;
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199 }
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200
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201 static void do_PyThread_exit_thread _P1(no_cleanup, int no_cleanup)
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202 {
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203 dprintf(("PyThread_exit_thread called\n"));
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204 if (!initialized) {
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205 if (no_cleanup)
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206 _exit(0);
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207 else
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208 exit(0);
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209 }
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210 }
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211
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212 void PyThread_exit_thread _P0()
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213 {
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214 do_PyThread_exit_thread(0);
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215 }
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216
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217 void PyThread__exit_thread _P0()
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218 {
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219 do_PyThread_exit_thread(1);
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220 }
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221
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222 #ifndef NO_EXIT_PROG
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223 static void do_PyThread_exit_prog _P2(status, int status, no_cleanup, int no_cleanup)
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224 {
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225 dprintf(("PyThread_exit_prog(%d) called\n", status));
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226 if (!initialized)
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227 if (no_cleanup)
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228 _exit(status);
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229 else
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230 exit(status);
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231 }
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232
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233 void PyThread_exit_prog _P1(status, int status)
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234 {
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235 do_PyThread_exit_prog(status, 0);
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236 }
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237
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238 void PyThread__exit_prog _P1(status, int status)
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239 {
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240 do_PyThread_exit_prog(status, 1);
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241 }
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242 #endif /* NO_EXIT_PROG */
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243
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244 /*
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245 * Lock support.
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246 */
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247 PyThread_type_lock PyThread_allocate_lock _P0()
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248 {
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249 pthread_lock *lock;
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250 int status, error = 0;
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251
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252 dprintf(("PyThread_allocate_lock called\n"));
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253 if (!initialized)
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254 PyThread_init_thread();
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255
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256 lock = (pthread_lock *) malloc(sizeof(pthread_lock));
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257 memset((void *)lock, '\0', sizeof(pthread_lock));
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258 if (lock) {
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259 lock->locked = 0;
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260
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261 status = pthread_mutex_init(&lock->mut,
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262 pthread_mutexattr_default);
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263 CHECK_STATUS("pthread_mutex_init");
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264
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265 status = pthread_cond_init(&lock->lock_released,
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266 pthread_condattr_default);
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267 CHECK_STATUS("pthread_cond_init");
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268
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269 if (error) {
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270 free((void *)lock);
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271 lock = 0;
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272 }
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273 }
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274
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275 dprintf(("PyThread_allocate_lock() -> %lx\n", (long)lock));
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276 return (PyThread_type_lock) lock;
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277 }
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278
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279 void PyThread_free_lock _P1(lock, PyThread_type_lock lock)
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280 {
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281 pthread_lock *thelock = (pthread_lock *)lock;
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282 int status, error = 0;
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283
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284 dprintf(("PyThread_free_lock(%lx) called\n", (long)lock));
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285
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286 status = pthread_mutex_destroy( &thelock->mut );
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287 CHECK_STATUS("pthread_mutex_destroy");
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288
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289 status = pthread_cond_destroy( &thelock->lock_released );
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290 CHECK_STATUS("pthread_cond_destroy");
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291
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292 free((void *)thelock);
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293 }
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294
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295 int PyThread_acquire_lock _P2(lock, PyThread_type_lock lock, waitflag, int waitflag)
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296 {
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297 int success;
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298 pthread_lock *thelock = (pthread_lock *)lock;
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299 int status, error = 0;
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300
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301 dprintf(("PyThread_acquire_lock(%lx, %d) called\n", (long)lock, waitflag));
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302
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303 status = pthread_mutex_lock( &thelock->mut );
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304 CHECK_STATUS("pthread_mutex_lock[1]");
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305 success = thelock->locked == 0;
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306 if (success) thelock->locked = 1;
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307 status = pthread_mutex_unlock( &thelock->mut );
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308 CHECK_STATUS("pthread_mutex_unlock[1]");
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309
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310 if ( !success && waitflag ) {
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311 /* continue trying until we get the lock */
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312
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313 /* mut must be locked by me -- part of the condition
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314 * protocol */
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315 status = pthread_mutex_lock( &thelock->mut );
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316 CHECK_STATUS("pthread_mutex_lock[2]");
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317 while ( thelock->locked ) {
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318 status = pthread_cond_wait(&thelock->lock_released,
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319 &thelock->mut);
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320 CHECK_STATUS("pthread_cond_wait");
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321 }
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322 thelock->locked = 1;
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323 status = pthread_mutex_unlock( &thelock->mut );
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324 CHECK_STATUS("pthread_mutex_unlock[2]");
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325 success = 1;
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326 }
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327 if (error) success = 0;
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328 dprintf(("PyThread_acquire_lock(%lx, %d) -> %d\n", (long)lock, waitflag, success));
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329 return success;
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330 }
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331
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332 void PyThread_release_lock _P1(lock, PyThread_type_lock lock)
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333 {
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334 pthread_lock *thelock = (pthread_lock *)lock;
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335 int status, error = 0;
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336
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337 dprintf(("PyThread_release_lock(%lx) called\n", (long)lock));
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338
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339 status = pthread_mutex_lock( &thelock->mut );
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340 CHECK_STATUS("pthread_mutex_lock[3]");
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341
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342 thelock->locked = 0;
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343
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344 status = pthread_mutex_unlock( &thelock->mut );
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345 CHECK_STATUS("pthread_mutex_unlock[3]");
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346
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347 /* wake up someone (anyone, if any) waiting on the lock */
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348 status = pthread_cond_signal( &thelock->lock_released );
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349 CHECK_STATUS("pthread_cond_signal");
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350 }
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351
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352 /*
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353 * Semaphore support.
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354 */
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355
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356 struct semaphore {
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357 pthread_mutex_t mutex;
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358 pthread_cond_t cond;
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359 int value;
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360 };
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361
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362 PyThread_type_sema PyThread_allocate_sema _P1(value, int value)
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363 {
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364 struct semaphore *sema;
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365 int status, error = 0;
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366
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367 dprintf(("PyThread_allocate_sema called\n"));
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368 if (!initialized)
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369 PyThread_init_thread();
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370
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371 sema = (struct semaphore *) malloc(sizeof(struct semaphore));
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372 if (sema != NULL) {
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373 sema->value = value;
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374 status = pthread_mutex_init(&sema->mutex,
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375 pthread_mutexattr_default);
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376 CHECK_STATUS("pthread_mutex_init");
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377 status = pthread_cond_init(&sema->cond,
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378 pthread_condattr_default);
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379 CHECK_STATUS("pthread_cond_init");
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380 if (error) {
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381 free((void *) sema);
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382 sema = NULL;
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383 }
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384 }
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385 dprintf(("PyThread_allocate_sema() -> %lx\n", (long) sema));
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386 return (PyThread_type_sema) sema;
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387 }
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388
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389 void PyThread_free_sema _P1(sema, PyThread_type_sema sema)
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390 {
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391 int status, error = 0;
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392 struct semaphore *thesema = (struct semaphore *) sema;
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393
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394 dprintf(("PyThread_free_sema(%lx) called\n", (long) sema));
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395 status = pthread_cond_destroy(&thesema->cond);
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396 CHECK_STATUS("pthread_cond_destroy");
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397 status = pthread_mutex_destroy(&thesema->mutex);
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398 CHECK_STATUS("pthread_mutex_destroy");
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399 free((void *) thesema);
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400 }
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401
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402 int PyThread_down_sema _P2(sema, PyThread_type_sema sema, waitflag, int waitflag)
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403 {
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404 int status, error = 0, success;
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405 struct semaphore *thesema = (struct semaphore *) sema;
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406
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407 dprintf(("PyThread_down_sema(%lx, %d) called\n", (long) sema, waitflag));
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408 status = pthread_mutex_lock(&thesema->mutex);
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409 CHECK_STATUS("pthread_mutex_lock");
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410 if (waitflag) {
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411 while (!error && thesema->value <= 0) {
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412 status = pthread_cond_wait(&thesema->cond,
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413 &thesema->mutex);
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414 CHECK_STATUS("pthread_cond_wait");
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415 }
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416 }
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417 if (error)
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418 success = 0;
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419 else if (thesema->value > 0) {
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420 thesema->value--;
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421 success = 1;
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422 }
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423 else
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424 success = 0;
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425 status = pthread_mutex_unlock(&thesema->mutex);
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426 CHECK_STATUS("pthread_mutex_unlock");
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427 dprintf(("PyThread_down_sema(%lx) return\n", (long) sema));
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428 return success;
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429 }
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430
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431 void PyThread_up_sema _P1(sema, PyThread_type_sema sema)
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432 {
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433 int status, error = 0;
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434 struct semaphore *thesema = (struct semaphore *) sema;
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435
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436 dprintf(("PyThread_up_sema(%lx)\n", (long) sema));
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437 status = pthread_mutex_lock(&thesema->mutex);
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438 CHECK_STATUS("pthread_mutex_lock");
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439 thesema->value++;
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440 status = pthread_cond_signal(&thesema->cond);
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441 CHECK_STATUS("pthread_cond_signal");
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442 status = pthread_mutex_unlock(&thesema->mutex);
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443 CHECK_STATUS("pthread_mutex_unlock");
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444 }