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Patch #525532: Add support for POSIX semaphores.
author Martin v. Löwis <martin@v.loewis.de>
date Sun, 17 Mar 2002 09:53:51 +0000
parents 8b116a8449bd
children 2548e2f323fa
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 /* Posix threads interface */
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3
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4 #include <stdlib.h>
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5 #include <string.h>
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6 #ifdef __APPLE__
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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 #ifdef __APPLE__
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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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14 #ifdef _POSIX_SEMAPHORES
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15 #include <semaphore.h>
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16 #include <errno.h>
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17 #endif
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19
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20 /* try to determine what version of the Pthread Standard is installed.
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21 * this is important, since all sorts of parameter types changed from
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22 * draft to draft and there are several (incompatible) drafts in
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23 * common use. these macros are a start, at least.
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24 * 12 May 1997 -- david arnold <davida@pobox.com>
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25 */
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27 #if defined(__ultrix) && defined(__mips) && defined(_DECTHREADS_)
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28 /* _DECTHREADS_ is defined in cma.h which is included by pthread.h */
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29 # define PY_PTHREAD_D4
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30
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31 #elif defined(__osf__) && defined (__alpha)
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32 /* _DECTHREADS_ is defined in cma.h which is included by pthread.h */
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33 # if !defined(_PTHREAD_ENV_ALPHA) || defined(_PTHREAD_USE_D4) || defined(PTHREAD_USE_D4)
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34 # define PY_PTHREAD_D4
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35 # else
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36 # define PY_PTHREAD_STD
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37 # endif
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38
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39 #elif defined(_AIX)
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40 /* SCHED_BG_NP is defined if using AIX DCE pthreads
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41 * but it is unsupported by AIX 4 pthreads. Default
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42 * attributes for AIX 4 pthreads equal to NULL. For
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43 * AIX DCE pthreads they should be left unchanged.
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44 */
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45 # if !defined(SCHED_BG_NP)
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46 # define PY_PTHREAD_STD
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47 # else
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48 # define PY_PTHREAD_D7
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49 # endif
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50
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51 #elif defined(__DGUX)
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52 # define PY_PTHREAD_D6
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53
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54 #elif defined(__hpux) && defined(_DECTHREADS_)
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55 # define PY_PTHREAD_D4
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56
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57 #else /* Default case */
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58 # define PY_PTHREAD_STD
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59
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60 #endif
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61
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62 #ifdef USE_GUSI
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63 /* The Macintosh GUSI I/O library sets the stackspace to
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64 ** 20KB, much too low. We up it to 64K.
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65 */
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66 #define THREAD_STACK_SIZE 0x10000
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67 #endif
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70 /* set default attribute object for different versions */
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71
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72 #if defined(PY_PTHREAD_D4) || defined(PY_PTHREAD_D7)
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73 # define pthread_attr_default pthread_attr_default
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74 # define pthread_mutexattr_default pthread_mutexattr_default
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75 # define pthread_condattr_default pthread_condattr_default
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76 #elif defined(PY_PTHREAD_STD) || defined(PY_PTHREAD_D6)
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77 # define pthread_attr_default ((pthread_attr_t *)NULL)
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78 # define pthread_mutexattr_default ((pthread_mutexattr_t *)NULL)
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79 # define pthread_condattr_default ((pthread_condattr_t *)NULL)
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80 #endif
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83 /* Whether or not to use semaphores directly rather than emulating them with
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84 * mutexes and condition variables:
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85 */
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86 #ifdef _POSIX_SEMAPHORES
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87 # define USE_SEMAPHORES
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88 #else
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89 # undef USE_SEMAPHORES
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90 #endif
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91
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92
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93 /* On platforms that don't use standard POSIX threads pthread_sigmask()
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94 * isn't present. DEC threads uses sigprocmask() instead as do most
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95 * other UNIX International compliant systems that don't have the full
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96 * pthread implementation.
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97 */
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98 #ifdef HAVE_PTHREAD_SIGMASK
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99 # define SET_THREAD_SIGMASK pthread_sigmask
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100 #else
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101 # define SET_THREAD_SIGMASK sigprocmask
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102 #endif
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103
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104
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105 /* A pthread mutex isn't sufficient to model the Python lock type
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106 * because, according to Draft 5 of the docs (P1003.4a/D5), both of the
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107 * following are undefined:
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108 * -> a thread tries to lock a mutex it already has locked
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109 * -> a thread tries to unlock a mutex locked by a different thread
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110 * pthread mutexes are designed for serializing threads over short pieces
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111 * of code anyway, so wouldn't be an appropriate implementation of
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112 * Python's locks regardless.
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113 *
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114 * The pthread_lock struct implements a Python lock as a "locked?" bit
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115 * and a <condition, mutex> pair. In general, if the bit can be acquired
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116 * instantly, it is, else the pair is used to block the thread until the
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117 * bit is cleared. 9 May 1994 tim@ksr.com
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118 */
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119
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120 typedef struct {
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121 char locked; /* 0=unlocked, 1=locked */
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122 /* a <cond, mutex> pair to handle an acquire of a locked lock */
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123 pthread_cond_t lock_released;
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124 pthread_mutex_t mut;
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125 } pthread_lock;
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126
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127 #define CHECK_STATUS(name) if (status != 0) { perror(name); error = 1; }
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128
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129 /*
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130 * Initialization.
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131 */
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132
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133 #ifdef _HAVE_BSDI
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134 static
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135 void _noop(void)
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136 {
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137 }
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138
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139 static void
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140 PyThread__init_thread(void)
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141 {
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142 /* DO AN INIT BY STARTING THE THREAD */
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143 static int dummy = 0;
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144 pthread_t thread1;
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145 pthread_create(&thread1, NULL, (void *) _noop, &dummy);
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146 pthread_join(thread1, NULL);
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147 }
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148
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149 #else /* !_HAVE_BSDI */
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150
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151 static void
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152 PyThread__init_thread(void)
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153 {
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154 #if defined(_AIX) && defined(__GNUC__)
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155 pthread_init();
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156 #endif
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157 }
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158
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159 #endif /* !_HAVE_BSDI */
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160
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161 /*
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162 * Thread support.
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163 */
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164
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165
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166 long
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167 PyThread_start_new_thread(void (*func)(void *), void *arg)
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168 {
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169 pthread_t th;
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170 int success;
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171 sigset_t oldmask, newmask;
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172 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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173 pthread_attr_t attrs;
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174 #endif
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175 dprintf(("PyThread_start_new_thread called\n"));
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176 if (!initialized)
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177 PyThread_init_thread();
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178
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179 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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180 pthread_attr_init(&attrs);
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181 #endif
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182 #ifdef THREAD_STACK_SIZE
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183 pthread_attr_setstacksize(&attrs, THREAD_STACK_SIZE);
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184 #endif
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185 #ifdef PTHREAD_SYSTEM_SCHED_SUPPORTED
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186 pthread_attr_setscope(&attrs, PTHREAD_SCOPE_SYSTEM);
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187 #endif
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188
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189 /* Mask all signals in the current thread before creating the new
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190 * thread. This causes the new thread to start with all signals
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191 * blocked.
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192 */
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193 sigfillset(&newmask);
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194 SET_THREAD_SIGMASK(SIG_BLOCK, &newmask, &oldmask);
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195
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196 success = pthread_create(&th,
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197 #if defined(PY_PTHREAD_D4)
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198 pthread_attr_default,
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199 (pthread_startroutine_t)func,
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200 (pthread_addr_t)arg
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201 #elif defined(PY_PTHREAD_D6)
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202 pthread_attr_default,
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203 (void* (*)(void *))func,
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204 arg
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205 #elif defined(PY_PTHREAD_D7)
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206 pthread_attr_default,
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207 func,
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208 arg
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209 #elif defined(PY_PTHREAD_STD)
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210 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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211 &attrs,
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212 #else
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213 (pthread_attr_t*)NULL,
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214 #endif
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215 (void* (*)(void *))func,
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216 (void *)arg
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217 #endif
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218 );
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219
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220 /* Restore signal mask for original thread */
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221 SET_THREAD_SIGMASK(SIG_SETMASK, &oldmask, NULL);
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222
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223 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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224 pthread_attr_destroy(&attrs);
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225 #endif
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226 if (success == 0) {
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227 #if defined(PY_PTHREAD_D4) || defined(PY_PTHREAD_D6) || defined(PY_PTHREAD_D7)
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228 pthread_detach(&th);
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229 #elif defined(PY_PTHREAD_STD)
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230 pthread_detach(th);
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231 #endif
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232 }
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233 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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234 return (long) th;
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235 #else
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236 return (long) *(long *) &th;
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237 #endif
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238 }
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239
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240 /* XXX This implementation is considered (to quote Tim Peters) "inherently
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241 hosed" because:
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242 - It does not guanrantee the promise that a non-zero integer is returned.
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243 - The cast to long is inherently unsafe.
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244 - It is not clear that the 'volatile' (for AIX?) and ugly casting in the
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245 latter return statement (for Alpha OSF/1) are any longer necessary.
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246 */
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247 long
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248 PyThread_get_thread_ident(void)
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249 {
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250 volatile pthread_t threadid;
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251 if (!initialized)
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252 PyThread_init_thread();
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253 /* Jump through some hoops for Alpha OSF/1 */
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254 threadid = pthread_self();
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255 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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256 return (long) threadid;
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257 #else
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258 return (long) *(long *) &threadid;
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259 #endif
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260 }
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261
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262 static void
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263 do_PyThread_exit_thread(int no_cleanup)
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264 {
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265 dprintf(("PyThread_exit_thread called\n"));
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266 if (!initialized) {
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267 if (no_cleanup)
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268 _exit(0);
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269 else
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270 exit(0);
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271 }
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272 }
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273
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274 void
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275 PyThread_exit_thread(void)
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276 {
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277 do_PyThread_exit_thread(0);
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278 }
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279
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280 void
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281 PyThread__exit_thread(void)
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282 {
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283 do_PyThread_exit_thread(1);
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284 }
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285
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286 #ifndef NO_EXIT_PROG
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287 static void
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288 do_PyThread_exit_prog(int status, int no_cleanup)
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289 {
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290 dprintf(("PyThread_exit_prog(%d) called\n", status));
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291 if (!initialized)
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292 if (no_cleanup)
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293 _exit(status);
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294 else
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295 exit(status);
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296 }
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297
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298 void
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299 PyThread_exit_prog(int status)
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300 {
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301 do_PyThread_exit_prog(status, 0);
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302 }
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303
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304 void
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305 PyThread__exit_prog(int status)
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306 {
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307 do_PyThread_exit_prog(status, 1);
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308 }
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309 #endif /* NO_EXIT_PROG */
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310
22339
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311 #ifdef USE_SEMAPHORES
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312
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313 /*
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314 * Lock support.
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315 */
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316
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317 PyThread_type_lock
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318 PyThread_allocate_lock(void)
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319 {
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320 sem_t *lock;
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321 int status, error = 0;
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322
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323 dprintf(("PyThread_allocate_lock called\n"));
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324 if (!initialized)
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325 PyThread_init_thread();
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326
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327 lock = (sem_t *)malloc(sizeof(sem_t));
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328
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329 if (lock) {
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330 status = sem_init(lock,0,1);
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331 CHECK_STATUS("sem_init");
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332
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333 if (error) {
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334 free((void *)lock);
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335 lock = NULL;
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336 }
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337 }
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338
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339 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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340 return (PyThread_type_lock)lock;
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341 }
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342
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343 void
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344 PyThread_free_lock(PyThread_type_lock lock)
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345 {
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346 sem_t *thelock = (sem_t *)lock;
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347 int status, error = 0;
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348
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349 dprintf(("PyThread_free_lock(%p) called\n", lock));
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350
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351 if (!thelock)
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352 return;
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353
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354 status = sem_destroy(thelock);
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355 CHECK_STATUS("sem_destroy");
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356
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357 free((void *)thelock);
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358 }
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359
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360 /*
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361 * As of February 2002, Cygwin thread implementations mistakenly report error
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362 * codes in the return value of the sem_ calls (like the pthread_ functions).
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363 * Correct implementations return -1 and put the code in errno. This supports
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364 * either.
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365 */
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366 static int
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367 fix_status(int status)
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368 {
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369 return (status == -1) ? errno : status;
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370 }
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371
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372 int
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373 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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374 {
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375 int success;
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376 sem_t *thelock = (sem_t *)lock;
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377 int status, error = 0;
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378
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379 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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380
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381 do {
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382 if (waitflag)
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383 status = fix_status(sem_wait(thelock));
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384 else
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385 status = fix_status(sem_trywait(thelock));
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386 } while (status == EINTR); /* Retry if interrupted by a signal */
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387
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diff changeset
388 if (waitflag) {
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
389 CHECK_STATUS("sem_wait");
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
390 } else if (status != EAGAIN) {
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
391 CHECK_STATUS("sem_trywait");
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
392 }
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 success = (status == 0) ? 1 : 0;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
395
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
396 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
diff changeset
397 return success;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
398 }
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
399
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
400 void
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
401 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
402 {
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
403 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
404 int status, error = 0;
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
405
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
406 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
407
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
408 status = sem_post(thelock);
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
409 CHECK_STATUS("sem_post");
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
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
412 #else /* USE_SEMAPHORES */
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
413
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
414 /*
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
415 * Lock support.
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
416 */
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
417 PyThread_type_lock
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
418 PyThread_allocate_lock(void)
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
419 {
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
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diff changeset
420 pthread_lock *lock;
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
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diff changeset
421 int status, error = 0;
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
422
9679
877d23bd5bdc Thanks to Chris Herborth, the thread primitives now have proper Py*
Guido van Rossum <guido@python.org>
parents: 9290
diff changeset
423 dprintf(("PyThread_allocate_lock called\n"));
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
424 if (!initialized)
9679
877d23bd5bdc Thanks to Chris Herborth, the thread primitives now have proper Py*
Guido van Rossum <guido@python.org>
parents: 9290
diff changeset
425 PyThread_init_thread();
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
426
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
427 lock = (pthread_lock *) malloc(sizeof(pthread_lock));
9290
2340f615da8f BSDI specific patches, inspired by Nigel Head and otto@mail.olympus.net.
Guido van Rossum <guido@python.org>
parents: 9079
diff changeset
428 memset((void *)lock, '\0', sizeof(pthread_lock));
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
429 if (lock) {
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
430 lock->locked = 0;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
431
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
432 status = pthread_mutex_init(&lock->mut,
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
433 pthread_mutexattr_default);
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
434 CHECK_STATUS("pthread_mutex_init");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
435
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
436 status = pthread_cond_init(&lock->lock_released,
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
437 pthread_condattr_default);
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
438 CHECK_STATUS("pthread_cond_init");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
439
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
440 if (error) {
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
441 free((void *)lock);
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
442 lock = 0;
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
443 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
444 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
445
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Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
446 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
9679
877d23bd5bdc Thanks to Chris Herborth, the thread primitives now have proper Py*
Guido van Rossum <guido@python.org>
parents: 9290
diff changeset
447 return (PyThread_type_lock) lock;
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
448 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
449
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
450 void
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
451 PyThread_free_lock(PyThread_type_lock lock)
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
452 {
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
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diff changeset
453 pthread_lock *thelock = (pthread_lock *)lock;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
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diff changeset
454 int status, error = 0;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
455
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Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
456 dprintf(("PyThread_free_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
457
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
458 status = pthread_mutex_destroy( &thelock->mut );
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
459 CHECK_STATUS("pthread_mutex_destroy");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
460
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
461 status = pthread_cond_destroy( &thelock->lock_released );
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
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diff changeset
462 CHECK_STATUS("pthread_cond_destroy");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
463
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
464 free((void *)thelock);
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
465 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
466
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
467 int
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
468 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
469 {
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
470 int success;
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
471 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
472 int status, error = 0;
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
473
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
474 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
475
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
476 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
477 CHECK_STATUS("pthread_mutex_lock[1]");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
478 success = thelock->locked == 0;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
479 if (success) thelock->locked = 1;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
480 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
481 CHECK_STATUS("pthread_mutex_unlock[1]");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
482
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
483 if ( !success && waitflag ) {
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
484 /* continue trying until we get the lock */
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
485
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
486 /* mut must be locked by me -- part of the condition
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
487 * protocol */
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
488 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
489 CHECK_STATUS("pthread_mutex_lock[2]");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
490 while ( thelock->locked ) {
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
491 status = pthread_cond_wait(&thelock->lock_released,
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
492 &thelock->mut);
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
493 CHECK_STATUS("pthread_cond_wait");
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
494 }
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
495 thelock->locked = 1;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
496 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
497 CHECK_STATUS("pthread_mutex_unlock[2]");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
498 success = 1;
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
499 }
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
500 if (error) success = 0;
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
501 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
502 return success;
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
503 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
504
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
505 void
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
506 PyThread_release_lock(PyThread_type_lock lock)
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
507 {
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
508 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
509 int status, error = 0;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
510
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
511 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
512
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
513 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
514 CHECK_STATUS("pthread_mutex_lock[3]");
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
515
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
516 thelock->locked = 0;
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
517
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
518 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
519 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
520
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
521 /* 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
522 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
523 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
524 }
22339
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
525
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
526 #endif /* USE_SEMAPHORES */