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annotate Python/thread_pthread.h @ 33950:633be43bed17 2.3

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Backported thread fixes from 2.4 (by mostly copying pystate.c over from 2.4): * using malloc() and free() directly, as explained in the new comment * coding style in the PyGILState_*() functions * the recent destroy-tstate-without-holding-the-GIL bug * lock fixes and many more comments in thread.c
author Armin Rigo <arigo@tunes.org>
date Tue, 09 Nov 2004 15:35:23 +0000
parents a408ac5527c3
children 4c8160088b34
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1
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2 /* Posix threads interface */
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4 #include <stdlib.h>
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5 #include <string.h>
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6 #if defined(__APPLE__) || defined(HAVE_PTHREAD_DESTRUCTOR)
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7 #define destructor xxdestructor
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8 #endif
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9 #include <pthread.h>
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10 #if defined(__APPLE__) || defined(HAVE_PTHREAD_DESTRUCTOR)
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11 #undef destructor
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12 #endif
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13 #include <signal.h>
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15 /* The POSIX spec says that implementations supporting the sem_*
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16 family of functions must indicate this by defining
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17 _POSIX_SEMAPHORES. */
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18 #ifdef _POSIX_SEMAPHORES
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19 #include <semaphore.h>
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20 #include <errno.h>
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21 #endif
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23
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24 /* try to determine what version of the Pthread Standard is installed.
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25 * this is important, since all sorts of parameter types changed from
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26 * draft to draft and there are several (incompatible) drafts in
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27 * common use. these macros are a start, at least.
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28 * 12 May 1997 -- david arnold <davida@pobox.com>
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29 */
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31 #if defined(__ultrix) && defined(__mips) && defined(_DECTHREADS_)
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32 /* _DECTHREADS_ is defined in cma.h which is included by pthread.h */
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33 # define PY_PTHREAD_D4
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34 # error Systems with PY_PTHREAD_D4 are unsupported. See README.
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36 #elif defined(__osf__) && defined (__alpha)
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37 /* _DECTHREADS_ is defined in cma.h which is included by pthread.h */
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38 # if !defined(_PTHREAD_ENV_ALPHA) || defined(_PTHREAD_USE_D4) || defined(PTHREAD_USE_D4)
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39 # define PY_PTHREAD_D4
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40 # error Systems with PY_PTHREAD_D4 are unsupported. See README.
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41 # else
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42 # define PY_PTHREAD_STD
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43 # endif
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45 #elif defined(_AIX)
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46 /* SCHED_BG_NP is defined if using AIX DCE pthreads
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47 * but it is unsupported by AIX 4 pthreads. Default
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48 * attributes for AIX 4 pthreads equal to NULL. For
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49 * AIX DCE pthreads they should be left unchanged.
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50 */
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51 # if !defined(SCHED_BG_NP)
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52 # define PY_PTHREAD_STD
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53 # else
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54 # define PY_PTHREAD_D7
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55 # error Systems with PY_PTHREAD_D7 are unsupported. See README.
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56 # endif
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58 #elif defined(__DGUX)
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59 # define PY_PTHREAD_D6
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60 # error Systems with PY_PTHREAD_D6 are unsupported. See README.
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62 #elif defined(__hpux) && defined(_DECTHREADS_)
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63 # define PY_PTHREAD_D4
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64 # error Systems with PY_PTHREAD_D4 are unsupported. See README.
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66 #else /* Default case */
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67 # define PY_PTHREAD_STD
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69 #endif
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71 #ifdef USE_GUSI
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72 /* The Macintosh GUSI I/O library sets the stackspace to
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73 ** 20KB, much too low. We up it to 64K.
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74 */
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75 #define THREAD_STACK_SIZE 0x10000
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76 #endif
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79 /* set default attribute object for different versions */
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80
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81 #if defined(PY_PTHREAD_D4) || defined(PY_PTHREAD_D7)
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82 #if !defined(pthread_attr_default)
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83 # define pthread_attr_default pthread_attr_default
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84 #endif
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85 #if !defined(pthread_mutexattr_default)
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86 # define pthread_mutexattr_default pthread_mutexattr_default
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87 #endif
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88 #if !defined(pthread_condattr_default)
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89 # define pthread_condattr_default pthread_condattr_default
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90 #endif
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91 #elif defined(PY_PTHREAD_STD) || defined(PY_PTHREAD_D6)
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92 #if !defined(pthread_attr_default)
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93 # define pthread_attr_default ((pthread_attr_t *)NULL)
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94 #endif
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95 #if !defined(pthread_mutexattr_default)
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96 # define pthread_mutexattr_default ((pthread_mutexattr_t *)NULL)
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97 #endif
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98 #if !defined(pthread_condattr_default)
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99 # define pthread_condattr_default ((pthread_condattr_t *)NULL)
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100 #endif
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101 #endif
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104 /* Whether or not to use semaphores directly rather than emulating them with
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105 * mutexes and condition variables:
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106 */
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107 #if defined(_POSIX_SEMAPHORES) && !defined(HAVE_BROKEN_POSIX_SEMAPHORES)
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108 # define USE_SEMAPHORES
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109 #else
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110 # undef USE_SEMAPHORES
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111 #endif
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112
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113
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114 /* On platforms that don't use standard POSIX threads pthread_sigmask()
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115 * isn't present. DEC threads uses sigprocmask() instead as do most
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116 * other UNIX International compliant systems that don't have the full
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117 * pthread implementation.
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118 */
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119 #if defined(HAVE_PTHREAD_SIGMASK) && !defined(HAVE_BROKEN_PTHREAD_SIGMASK)
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120 # define SET_THREAD_SIGMASK pthread_sigmask
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121 #else
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122 # define SET_THREAD_SIGMASK sigprocmask
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123 #endif
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124
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125
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126 /* A pthread mutex isn't sufficient to model the Python lock type
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127 * because, according to Draft 5 of the docs (P1003.4a/D5), both of the
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128 * following are undefined:
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129 * -> a thread tries to lock a mutex it already has locked
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130 * -> a thread tries to unlock a mutex locked by a different thread
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131 * pthread mutexes are designed for serializing threads over short pieces
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132 * of code anyway, so wouldn't be an appropriate implementation of
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133 * Python's locks regardless.
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134 *
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135 * The pthread_lock struct implements a Python lock as a "locked?" bit
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136 * and a <condition, mutex> pair. In general, if the bit can be acquired
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137 * instantly, it is, else the pair is used to block the thread until the
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138 * bit is cleared. 9 May 1994 tim@ksr.com
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139 */
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140
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141 typedef struct {
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142 char locked; /* 0=unlocked, 1=locked */
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143 /* a <cond, mutex> pair to handle an acquire of a locked lock */
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144 pthread_cond_t lock_released;
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145 pthread_mutex_t mut;
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146 } pthread_lock;
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147
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148 #define CHECK_STATUS(name) if (status != 0) { perror(name); error = 1; }
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149
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150 /*
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151 * Initialization.
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152 */
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153
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154 #ifdef _HAVE_BSDI
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155 static
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156 void _noop(void)
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157 {
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158 }
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159
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160 static void
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161 PyThread__init_thread(void)
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162 {
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163 /* DO AN INIT BY STARTING THE THREAD */
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164 static int dummy = 0;
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165 pthread_t thread1;
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166 pthread_create(&thread1, NULL, (void *) _noop, &dummy);
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167 pthread_join(thread1, NULL);
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168 }
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169
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170 #else /* !_HAVE_BSDI */
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171
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172 static void
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173 PyThread__init_thread(void)
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174 {
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175 #if defined(_AIX) && defined(__GNUC__)
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176 pthread_init();
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177 #endif
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178 }
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179
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180 #endif /* !_HAVE_BSDI */
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181
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182 /*
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183 * Thread support.
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184 */
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185
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186
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187 long
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188 PyThread_start_new_thread(void (*func)(void *), void *arg)
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189 {
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190 pthread_t th;
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191 int status;
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192 sigset_t oldmask, newmask;
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193 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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194 pthread_attr_t attrs;
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195 #endif
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196 dprintf(("PyThread_start_new_thread called\n"));
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197 if (!initialized)
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198 PyThread_init_thread();
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199
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200 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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201 pthread_attr_init(&attrs);
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202 #endif
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203 #ifdef THREAD_STACK_SIZE
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204 pthread_attr_setstacksize(&attrs, THREAD_STACK_SIZE);
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205 #endif
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206 #ifdef PTHREAD_SYSTEM_SCHED_SUPPORTED
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207 pthread_attr_setscope(&attrs, PTHREAD_SCOPE_SYSTEM);
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208 #endif
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209
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210 /* Mask all signals in the current thread before creating the new
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211 * thread. This causes the new thread to start with all signals
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212 * blocked.
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213 */
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214 sigfillset(&newmask);
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215 SET_THREAD_SIGMASK(SIG_BLOCK, &newmask, &oldmask);
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216
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217 status = pthread_create(&th,
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218 #if defined(PY_PTHREAD_D4)
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219 pthread_attr_default,
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220 (pthread_startroutine_t)func,
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221 (pthread_addr_t)arg
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222 #elif defined(PY_PTHREAD_D6)
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223 pthread_attr_default,
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224 (void* (*)(void *))func,
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225 arg
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226 #elif defined(PY_PTHREAD_D7)
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227 pthread_attr_default,
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228 func,
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229 arg
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230 #elif defined(PY_PTHREAD_STD)
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231 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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232 &attrs,
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233 #else
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234 (pthread_attr_t*)NULL,
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235 #endif
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236 (void* (*)(void *))func,
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237 (void *)arg
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238 #endif
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239 );
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240
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241 /* Restore signal mask for original thread */
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242 SET_THREAD_SIGMASK(SIG_SETMASK, &oldmask, NULL);
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243
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244 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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245 pthread_attr_destroy(&attrs);
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246 #endif
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247 if (status != 0)
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248 return -1;
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249
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250 #if defined(PY_PTHREAD_D4) || defined(PY_PTHREAD_D6) || defined(PY_PTHREAD_D7)
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251 pthread_detach(&th);
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252 #elif defined(PY_PTHREAD_STD)
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253 pthread_detach(th);
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254 #endif
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255
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256 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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257 return (long) th;
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258 #else
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259 return (long) *(long *) &th;
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260 #endif
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261 }
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262
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263 /* XXX This implementation is considered (to quote Tim Peters) "inherently
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264 hosed" because:
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265 - It does not guanrantee the promise that a non-zero integer is returned.
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266 - The cast to long is inherently unsafe.
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267 - It is not clear that the 'volatile' (for AIX?) and ugly casting in the
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268 latter return statement (for Alpha OSF/1) are any longer necessary.
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269 */
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270 long
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271 PyThread_get_thread_ident(void)
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272 {
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273 volatile pthread_t threadid;
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274 if (!initialized)
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275 PyThread_init_thread();
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276 /* Jump through some hoops for Alpha OSF/1 */
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277 threadid = pthread_self();
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278 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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279 return (long) threadid;
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280 #else
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281 return (long) *(long *) &threadid;
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282 #endif
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283 }
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284
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285 static void
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286 do_PyThread_exit_thread(int no_cleanup)
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287 {
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288 dprintf(("PyThread_exit_thread called\n"));
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289 if (!initialized) {
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290 if (no_cleanup)
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291 _exit(0);
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292 else
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293 exit(0);
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294 }
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295 }
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296
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297 void
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298 PyThread_exit_thread(void)
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299 {
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300 do_PyThread_exit_thread(0);
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301 }
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302
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303 void
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304 PyThread__exit_thread(void)
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305 {
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306 do_PyThread_exit_thread(1);
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307 }
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308
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309 #ifndef NO_EXIT_PROG
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310 static void
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311 do_PyThread_exit_prog(int status, int no_cleanup)
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312 {
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313 dprintf(("PyThread_exit_prog(%d) called\n", status));
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314 if (!initialized)
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315 if (no_cleanup)
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316 _exit(status);
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317 else
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318 exit(status);
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319 }
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320
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321 void
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322 PyThread_exit_prog(int status)
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323 {
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324 do_PyThread_exit_prog(status, 0);
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325 }
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326
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327 void
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328 PyThread__exit_prog(int status)
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329 {
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330 do_PyThread_exit_prog(status, 1);
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331 }
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332 #endif /* NO_EXIT_PROG */
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333
22339
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334 #ifdef USE_SEMAPHORES
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335
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336 /*
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337 * Lock support.
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338 */
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339
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340 PyThread_type_lock
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341 PyThread_allocate_lock(void)
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342 {
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343 sem_t *lock;
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344 int status, error = 0;
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345
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346 dprintf(("PyThread_allocate_lock called\n"));
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347 if (!initialized)
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348 PyThread_init_thread();
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349
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350 lock = (sem_t *)malloc(sizeof(sem_t));
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351
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352 if (lock) {
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353 status = sem_init(lock,0,1);
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354 CHECK_STATUS("sem_init");
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355
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356 if (error) {
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357 free((void *)lock);
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358 lock = NULL;
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359 }
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360 }
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361
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362 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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363 return (PyThread_type_lock)lock;
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364 }
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365
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366 void
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367 PyThread_free_lock(PyThread_type_lock lock)
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368 {
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369 sem_t *thelock = (sem_t *)lock;
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370 int status, error = 0;
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371
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372 dprintf(("PyThread_free_lock(%p) called\n", lock));
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373
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374 if (!thelock)
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375 return;
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376
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377 status = sem_destroy(thelock);
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378 CHECK_STATUS("sem_destroy");
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379
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380 free((void *)thelock);
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381 }
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382
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383 /*
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
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parents: 21766
diff changeset
384 * As of February 2002, Cygwin thread implementations mistakenly report error
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
385 * codes in the return value of the sem_ calls (like the pthread_ functions).
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
386 * Correct implementations return -1 and put the code in errno. This supports
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
387 * either.
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
388 */
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
389 static int
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
390 fix_status(int status)
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
391 {
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
392 return (status == -1) ? errno : status;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
393 }
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
394
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
395 int
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
396 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
397 {
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
398 int success;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
399 sem_t *thelock = (sem_t *)lock;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
400 int status, error = 0;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
401
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
402 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
403
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
404 do {
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
405 if (waitflag)
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
406 status = fix_status(sem_wait(thelock));
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
407 else
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
408 status = fix_status(sem_trywait(thelock));
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
409 } while (status == EINTR); /* Retry if interrupted by a signal */
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
410
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
411 if (waitflag) {
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
412 CHECK_STATUS("sem_wait");
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
413 } else if (status != EAGAIN) {
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
414 CHECK_STATUS("sem_trywait");
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
415 }
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
416
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
417 success = (status == 0) ? 1 : 0;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
418
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
419 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
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420 return success;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
421 }
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
422
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
423 void
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
424 PyThread_release_lock(PyThread_type_lock lock)
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
425 {
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
426 sem_t *thelock = (sem_t *)lock;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
427 int status, error = 0;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
428
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
429 dprintf(("PyThread_release_lock(%p) called\n", lock));
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
430
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
431 status = sem_post(thelock);
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
432 CHECK_STATUS("sem_post");
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
433 }
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
434
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
435 #else /* USE_SEMAPHORES */
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
436
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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diff changeset
437 /*
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
438 * Lock support.
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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diff changeset
439 */
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
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440 PyThread_type_lock
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441 PyThread_allocate_lock(void)
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442 {
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443 pthread_lock *lock;
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444 int status, error = 0;
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445
9679
877d23bd5bdc Thanks to Chris Herborth, the thread primitives now have proper Py*
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446 dprintf(("PyThread_allocate_lock called\n"));
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447 if (!initialized)
9679
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448 PyThread_init_thread();
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449
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450 lock = (pthread_lock *) malloc(sizeof(pthread_lock));
9290
2340f615da8f BSDI specific patches, inspired by Nigel Head and otto@mail.olympus.net.
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diff changeset
451 memset((void *)lock, '\0', sizeof(pthread_lock));
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452 if (lock) {
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453 lock->locked = 0;
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diff changeset
454
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diff changeset
455 status = pthread_mutex_init(&lock->mut,
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456 pthread_mutexattr_default);
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diff changeset
457 CHECK_STATUS("pthread_mutex_init");
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diff changeset
458
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diff changeset
459 status = pthread_cond_init(&lock->lock_released,
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diff changeset
460 pthread_condattr_default);
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diff changeset
461 CHECK_STATUS("pthread_cond_init");
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diff changeset
462
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diff changeset
463 if (error) {
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diff changeset
464 free((void *)lock);
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diff changeset
465 lock = 0;
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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diff changeset
466 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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diff changeset
467 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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diff changeset
468
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
469 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
9679
877d23bd5bdc Thanks to Chris Herborth, the thread primitives now have proper Py*
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diff changeset
470 return (PyThread_type_lock) lock;
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diff changeset
471 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
472
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f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
473 void
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
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parents: 13256
diff changeset
474 PyThread_free_lock(PyThread_type_lock lock)
1628
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diff changeset
475 {
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diff changeset
476 pthread_lock *thelock = (pthread_lock *)lock;
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diff changeset
477 int status, error = 0;
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parents: 1628
diff changeset
478
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ff243b0f16ee Trent Mick <trentm@activestate.com>:
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parents: 10400
diff changeset
479 dprintf(("PyThread_free_lock(%p) called\n", lock));
1629
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diff changeset
480
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diff changeset
481 status = pthread_mutex_destroy( &thelock->mut );
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diff changeset
482 CHECK_STATUS("pthread_mutex_destroy");
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diff changeset
483
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diff changeset
484 status = pthread_cond_destroy( &thelock->lock_released );
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diff changeset
485 CHECK_STATUS("pthread_cond_destroy");
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diff changeset
486
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diff changeset
487 free((void *)thelock);
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488 }
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parents:
diff changeset
489
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Thomas Wouters <thomas@python.org>
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diff changeset
490 int
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
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parents: 13256
diff changeset
491 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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492 {
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diff changeset
493 int success;
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diff changeset
494 pthread_lock *thelock = (pthread_lock *)lock;
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diff changeset
495 int status, error = 0;
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diff changeset
496
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parents: 10400
diff changeset
497 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
1629
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parents: 1628
diff changeset
498
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
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diff changeset
499 status = pthread_mutex_lock( &thelock->mut );
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diff changeset
500 CHECK_STATUS("pthread_mutex_lock[1]");
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diff changeset
501 success = thelock->locked == 0;
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parents: 1628
diff changeset
502
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parents: 1628
diff changeset
503 if ( !success && waitflag ) {
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diff changeset
504 /* continue trying until we get the lock */
1628
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parents:
diff changeset
505
1629
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diff changeset
506 /* mut must be locked by me -- part of the condition
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diff changeset
507 * protocol */
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diff changeset
508 while ( thelock->locked ) {
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diff changeset
509 status = pthread_cond_wait(&thelock->lock_released,
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
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diff changeset
510 &thelock->mut);
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diff changeset
511 CHECK_STATUS("pthread_cond_wait");
1628
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diff changeset
512 }
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diff changeset
513 success = 1;
1628
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Guido van Rossum <guido@python.org>
parents:
diff changeset
514 }
28673
c1ba50790c83 Patch #711835: Remove unnecessary lock operations. Will backport to 2.2.
Martin v. Löwis <martin@v.loewis.de>
parents: 27320
diff changeset
515 if (success) thelock->locked = 1;
c1ba50790c83 Patch #711835: Remove unnecessary lock operations. Will backport to 2.2.
Martin v. Löwis <martin@v.loewis.de>
parents: 27320
diff changeset
516 status = pthread_mutex_unlock( &thelock->mut );
c1ba50790c83 Patch #711835: Remove unnecessary lock operations. Will backport to 2.2.
Martin v. Löwis <martin@v.loewis.de>
parents: 27320
diff changeset
517 CHECK_STATUS("pthread_mutex_unlock[1]");
c1ba50790c83 Patch #711835: Remove unnecessary lock operations. Will backport to 2.2.
Martin v. Löwis <martin@v.loewis.de>
parents: 27320
diff changeset
518
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
519 if (error) success = 0;
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
520 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
521 return success;
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
522 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
523
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
524 void
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
525 PyThread_release_lock(PyThread_type_lock lock)
1628
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Guido van Rossum <guido@python.org>
parents:
diff changeset
526 {
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
527 pthread_lock *thelock = (pthread_lock *)lock;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
528 int status, error = 0;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
529
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
530 dprintf(("PyThread_release_lock(%p) called\n", lock));
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
531
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
532 status = pthread_mutex_lock( &thelock->mut );
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
533 CHECK_STATUS("pthread_mutex_lock[3]");
1628
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Guido van Rossum <guido@python.org>
parents:
diff changeset
534
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
535 thelock->locked = 0;
1628
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Guido van Rossum <guido@python.org>
parents:
diff changeset
536
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
537 status = pthread_mutex_unlock( &thelock->mut );
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
538 CHECK_STATUS("pthread_mutex_unlock[3]");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
539
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
540 /* wake up someone (anyone, if any) waiting on the lock */
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
541 status = pthread_cond_signal( &thelock->lock_released );
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
542 CHECK_STATUS("pthread_cond_signal");
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
543 }
22339
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
544
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
545 #endif /* USE_SEMAPHORES */