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annotate Python/thread_pthread.h @ 65616:a4a27240fe09 2.7

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Merged revisions 85814 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r85814 | benjamin.peterson | 2010-10-23 21:52:05 -0500 (Sat, 23 Oct 2010) | 1 line remove broken code accounting an offset the size of the line #10186 ........
author Benjamin Peterson <benjamin@python.org>
date Sun, 24 Oct 2010 03:00:35 +0000
parents fd25030223b0
children b36cb4602e21
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 #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 requires that use of pthread_attr_setstacksize
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16 be conditional on _POSIX_THREAD_ATTR_STACKSIZE being defined. */
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17 #ifdef _POSIX_THREAD_ATTR_STACKSIZE
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18 #ifndef THREAD_STACK_SIZE
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19 #define THREAD_STACK_SIZE 0 /* use default stack size */
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20 #endif
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21 /* for safety, ensure a viable minimum stacksize */
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22 #define THREAD_STACK_MIN 0x8000 /* 32kB */
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23 #else /* !_POSIX_THREAD_ATTR_STACKSIZE */
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24 #ifdef THREAD_STACK_SIZE
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25 #error "THREAD_STACK_SIZE defined but _POSIX_THREAD_ATTR_STACKSIZE undefined"
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26 #endif
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27 #endif
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29 /* The POSIX spec says that implementations supporting the sem_*
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30 family of functions must indicate this by defining
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31 _POSIX_SEMAPHORES. */
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32 #ifdef _POSIX_SEMAPHORES
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33 /* On FreeBSD 4.x, _POSIX_SEMAPHORES is defined empty, so
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34 we need to add 0 to make it work there as well. */
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35 #if (_POSIX_SEMAPHORES+0) == -1
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36 #define HAVE_BROKEN_POSIX_SEMAPHORES
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37 #else
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38 #include <semaphore.h>
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39 #include <errno.h>
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40 #endif
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41 #endif
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43 /* Before FreeBSD 5.4, system scope threads was very limited resource
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44 in default setting. So the process scope is preferred to get
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45 enough number of threads to work. */
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46 #ifdef __FreeBSD__
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47 #include <osreldate.h>
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48 #if __FreeBSD_version >= 500000 && __FreeBSD_version < 504101
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49 #undef PTHREAD_SYSTEM_SCHED_SUPPORTED
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50 #endif
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51 #endif
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53 #if !defined(pthread_attr_default)
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54 # define pthread_attr_default ((pthread_attr_t *)NULL)
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55 #endif
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56 #if !defined(pthread_mutexattr_default)
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57 # define pthread_mutexattr_default ((pthread_mutexattr_t *)NULL)
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58 #endif
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59 #if !defined(pthread_condattr_default)
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60 # define pthread_condattr_default ((pthread_condattr_t *)NULL)
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61 #endif
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64 /* Whether or not to use semaphores directly rather than emulating them with
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65 * mutexes and condition variables:
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66 */
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67 #if defined(_POSIX_SEMAPHORES) && !defined(HAVE_BROKEN_POSIX_SEMAPHORES)
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68 # define USE_SEMAPHORES
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69 #else
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70 # undef USE_SEMAPHORES
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71 #endif
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72
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73
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74 /* On platforms that don't use standard POSIX threads pthread_sigmask()
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75 * isn't present. DEC threads uses sigprocmask() instead as do most
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76 * other UNIX International compliant systems that don't have the full
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77 * pthread implementation.
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78 */
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79 #if defined(HAVE_PTHREAD_SIGMASK) && !defined(HAVE_BROKEN_PTHREAD_SIGMASK)
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80 # define SET_THREAD_SIGMASK pthread_sigmask
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81 #else
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82 # define SET_THREAD_SIGMASK sigprocmask
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83 #endif
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84
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85
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86 /* A pthread mutex isn't sufficient to model the Python lock type
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87 * because, according to Draft 5 of the docs (P1003.4a/D5), both of the
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88 * following are undefined:
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89 * -> a thread tries to lock a mutex it already has locked
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90 * -> a thread tries to unlock a mutex locked by a different thread
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91 * pthread mutexes are designed for serializing threads over short pieces
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92 * of code anyway, so wouldn't be an appropriate implementation of
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93 * Python's locks regardless.
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94 *
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95 * The pthread_lock struct implements a Python lock as a "locked?" bit
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96 * and a <condition, mutex> pair. In general, if the bit can be acquired
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97 * instantly, it is, else the pair is used to block the thread until the
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98 * bit is cleared. 9 May 1994 tim@ksr.com
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99 */
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100
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101 typedef struct {
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102 char locked; /* 0=unlocked, 1=locked */
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103 /* a <cond, mutex> pair to handle an acquire of a locked lock */
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104 pthread_cond_t lock_released;
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105 pthread_mutex_t mut;
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106 } pthread_lock;
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107
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108 #define CHECK_STATUS(name) if (status != 0) { perror(name); error = 1; }
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109
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110 /*
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111 * Initialization.
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112 */
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113
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114 #ifdef _HAVE_BSDI
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115 static
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116 void _noop(void)
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117 {
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118 }
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120 static void
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121 PyThread__init_thread(void)
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122 {
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123 /* DO AN INIT BY STARTING THE THREAD */
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124 static int dummy = 0;
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125 pthread_t thread1;
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126 pthread_create(&thread1, NULL, (void *) _noop, &dummy);
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127 pthread_join(thread1, NULL);
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128 }
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129
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130 #else /* !_HAVE_BSDI */
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131
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132 static void
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133 PyThread__init_thread(void)
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134 {
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135 #if defined(_AIX) && defined(__GNUC__)
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136 pthread_init();
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137 #endif
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138 }
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139
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140 #endif /* !_HAVE_BSDI */
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141
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142 /*
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143 * Thread support.
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144 */
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145
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146
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147 long
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148 PyThread_start_new_thread(void (*func)(void *), void *arg)
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149 {
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150 pthread_t th;
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151 int status;
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152 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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153 pthread_attr_t attrs;
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154 #endif
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155 #if defined(THREAD_STACK_SIZE)
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156 size_t tss;
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157 #endif
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158
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159 dprintf(("PyThread_start_new_thread called\n"));
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160 if (!initialized)
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161 PyThread_init_thread();
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162
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163 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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164 if (pthread_attr_init(&attrs) != 0)
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165 return -1;
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166 #endif
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167 #if defined(THREAD_STACK_SIZE)
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168 tss = (_pythread_stacksize != 0) ? _pythread_stacksize
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169 : THREAD_STACK_SIZE;
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170 if (tss != 0) {
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171 if (pthread_attr_setstacksize(&attrs, tss) != 0) {
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172 pthread_attr_destroy(&attrs);
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173 return -1;
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174 }
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175 }
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176 #endif
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177 #if defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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178 pthread_attr_setscope(&attrs, PTHREAD_SCOPE_SYSTEM);
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179 #endif
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180
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181 status = pthread_create(&th,
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182 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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183 &attrs,
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184 #else
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185 (pthread_attr_t*)NULL,
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186 #endif
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187 (void* (*)(void *))func,
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188 (void *)arg
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189 );
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190
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191 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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192 pthread_attr_destroy(&attrs);
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193 #endif
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194 if (status != 0)
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195 return -1;
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196
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197 pthread_detach(th);
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198
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199 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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200 return (long) th;
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201 #else
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202 return (long) *(long *) &th;
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203 #endif
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204 }
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205
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206 /* XXX This implementation is considered (to quote Tim Peters) "inherently
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207 hosed" because:
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208 - It does not guarantee the promise that a non-zero integer is returned.
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209 - The cast to long is inherently unsafe.
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210 - It is not clear that the 'volatile' (for AIX?) and ugly casting in the
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211 latter return statement (for Alpha OSF/1) are any longer necessary.
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212 */
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213 long
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214 PyThread_get_thread_ident(void)
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215 {
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216 volatile pthread_t threadid;
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217 if (!initialized)
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218 PyThread_init_thread();
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219 /* Jump through some hoops for Alpha OSF/1 */
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220 threadid = pthread_self();
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221 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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222 return (long) threadid;
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223 #else
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224 return (long) *(long *) &threadid;
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225 #endif
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226 }
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227
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228 void
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229 PyThread_exit_thread(void)
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230 {
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231 dprintf(("PyThread_exit_thread called\n"));
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232 if (!initialized) {
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233 exit(0);
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234 }
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235 }
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236
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237 #ifdef USE_SEMAPHORES
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238
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239 /*
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240 * Lock support.
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241 */
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242
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243 PyThread_type_lock
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244 PyThread_allocate_lock(void)
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245 {
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246 sem_t *lock;
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247 int status, error = 0;
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248
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249 dprintf(("PyThread_allocate_lock called\n"));
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250 if (!initialized)
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251 PyThread_init_thread();
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252
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253 lock = (sem_t *)malloc(sizeof(sem_t));
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254
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255 if (lock) {
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256 status = sem_init(lock,0,1);
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257 CHECK_STATUS("sem_init");
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258
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259 if (error) {
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260 free((void *)lock);
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261 lock = NULL;
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262 }
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263 }
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264
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265 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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266 return (PyThread_type_lock)lock;
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267 }
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268
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269 void
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270 PyThread_free_lock(PyThread_type_lock lock)
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271 {
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272 sem_t *thelock = (sem_t *)lock;
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273 int status, error = 0;
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274
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275 dprintf(("PyThread_free_lock(%p) called\n", lock));
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276
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277 if (!thelock)
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278 return;
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279
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280 status = sem_destroy(thelock);
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281 CHECK_STATUS("sem_destroy");
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282
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283 free((void *)thelock);
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284 }
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285
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286 /*
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287 * As of February 2002, Cygwin thread implementations mistakenly report error
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288 * codes in the return value of the sem_ calls (like the pthread_ functions).
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289 * Correct implementations return -1 and put the code in errno. This supports
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290 * either.
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291 */
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292 static int
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293 fix_status(int status)
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294 {
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295 return (status == -1) ? errno : status;
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296 }
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297
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298 int
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299 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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300 {
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301 int success;
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302 sem_t *thelock = (sem_t *)lock;
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303 int status, error = 0;
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304
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305 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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306
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307 do {
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308 if (waitflag)
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309 status = fix_status(sem_wait(thelock));
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310 else
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311 status = fix_status(sem_trywait(thelock));
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312 } while (status == EINTR); /* Retry if interrupted by a signal */
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313
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314 if (waitflag) {
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315 CHECK_STATUS("sem_wait");
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316 } else if (status != EAGAIN) {
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317 CHECK_STATUS("sem_trywait");
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318 }
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319
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320 success = (status == 0) ? 1 : 0;
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321
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322 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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323 return success;
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324 }
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325
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326 void
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327 PyThread_release_lock(PyThread_type_lock lock)
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328 {
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329 sem_t *thelock = (sem_t *)lock;
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330 int status, error = 0;
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331
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332 dprintf(("PyThread_release_lock(%p) called\n", lock));
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333
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334 status = sem_post(thelock);
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335 CHECK_STATUS("sem_post");
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336 }
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337
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338 #else /* USE_SEMAPHORES */
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339
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340 /*
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341 * Lock support.
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342 */
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343 PyThread_type_lock
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344 PyThread_allocate_lock(void)
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345 {
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346 pthread_lock *lock;
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347 int status, error = 0;
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348
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349 dprintf(("PyThread_allocate_lock called\n"));
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350 if (!initialized)
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351 PyThread_init_thread();
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352
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353 lock = (pthread_lock *) malloc(sizeof(pthread_lock));
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354 if (lock) {
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355 memset((void *)lock, '\0', sizeof(pthread_lock));
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356 lock->locked = 0;
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357
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358 status = pthread_mutex_init(&lock->mut,
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359 pthread_mutexattr_default);
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360 CHECK_STATUS("pthread_mutex_init");
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361
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362 status = pthread_cond_init(&lock->lock_released,
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363 pthread_condattr_default);
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364 CHECK_STATUS("pthread_cond_init");
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365
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366 if (error) {
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367 free((void *)lock);
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368 lock = 0;
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369 }
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370 }
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371
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372 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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373 return (PyThread_type_lock) lock;
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374 }
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375
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376 void
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377 PyThread_free_lock(PyThread_type_lock lock)
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378 {
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379 pthread_lock *thelock = (pthread_lock *)lock;
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380 int status, error = 0;
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381
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382 dprintf(("PyThread_free_lock(%p) called\n", lock));
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383
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384 status = pthread_mutex_destroy( &thelock->mut );
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385 CHECK_STATUS("pthread_mutex_destroy");
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386
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387 status = pthread_cond_destroy( &thelock->lock_released );
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388 CHECK_STATUS("pthread_cond_destroy");
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389
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390 free((void *)thelock);
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391 }
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392
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393 int
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394 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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395 {
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396 int success;
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397 pthread_lock *thelock = (pthread_lock *)lock;
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398 int status, error = 0;
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399
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400 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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401
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402 status = pthread_mutex_lock( &thelock->mut );
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403 CHECK_STATUS("pthread_mutex_lock[1]");
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404 success = thelock->locked == 0;
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405
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406 if ( !success && waitflag ) {
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407 /* continue trying until we get the lock */
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408
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409 /* mut must be locked by me -- part of the condition
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410 * protocol */
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411 while ( thelock->locked ) {
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412 status = pthread_cond_wait(&thelock->lock_released,
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413 &thelock->mut);
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414 CHECK_STATUS("pthread_cond_wait");
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415 }
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416 success = 1;
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417 }
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418 if (success) thelock->locked = 1;
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419 status = pthread_mutex_unlock( &thelock->mut );
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420 CHECK_STATUS("pthread_mutex_unlock[1]");
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421
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422 if (error) success = 0;
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423 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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424 return success;
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425 }
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426
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427 void
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428 PyThread_release_lock(PyThread_type_lock lock)
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429 {
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430 pthread_lock *thelock = (pthread_lock *)lock;
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431 int status, error = 0;
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432
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433 dprintf(("PyThread_release_lock(%p) called\n", lock));
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434
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435 status = pthread_mutex_lock( &thelock->mut );
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436 CHECK_STATUS("pthread_mutex_lock[3]");
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437
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438 thelock->locked = 0;
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439
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440 status = pthread_mutex_unlock( &thelock->mut );
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441 CHECK_STATUS("pthread_mutex_unlock[3]");
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442
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443 /* wake up someone (anyone, if any) waiting on the lock */
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444 status = pthread_cond_signal( &thelock->lock_released );
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445 CHECK_STATUS("pthread_cond_signal");
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446 }
22339
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
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447
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
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448 #endif /* USE_SEMAPHORES */
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449
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450 /* set the thread stack size.
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451 * Return 0 if size is valid, -1 if size is invalid,
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452 * -2 if setting stack size is not supported.
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453 */
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454 static int
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455 _pythread_pthread_set_stacksize(size_t size)
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456 {
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457 #if defined(THREAD_STACK_SIZE)
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458 pthread_attr_t attrs;
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459 size_t tss_min;
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460 int rc = 0;
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461 #endif
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462
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463 /* set to default */
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464 if (size == 0) {
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465 _pythread_stacksize = 0;
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466 return 0;
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467 }
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468
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469 #if defined(THREAD_STACK_SIZE)
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470 #if defined(PTHREAD_STACK_MIN)
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471 tss_min = PTHREAD_STACK_MIN > THREAD_STACK_MIN ? PTHREAD_STACK_MIN
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472 : THREAD_STACK_MIN;
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473 #else
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474 tss_min = THREAD_STACK_MIN;
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475 #endif
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476 if (size >= tss_min) {
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477 /* validate stack size by setting thread attribute */
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478 if (pthread_attr_init(&attrs) == 0) {
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479 rc = pthread_attr_setstacksize(&attrs, size);
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480 pthread_attr_destroy(&attrs);
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481 if (rc == 0) {
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482 _pythread_stacksize = size;
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483 return 0;
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484 }
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485 }
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486 }
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487 return -1;
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488 #else
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489 return -2;
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490 #endif
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491 }
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492
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493 #define THREAD_SET_STACKSIZE(x) _pythread_pthread_set_stacksize(x)