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annotate Python/thread_pthread.h @ 34762:fcb507414c41 2.4

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Patch #1163249 - Correctly handle _POSIX_SEMAPHORES == -1 to mean no support for posix semaphores.
author Anthony Baxter <anthonybaxter@gmail.com>
date Wed, 16 Mar 2005 04:13:29 +0000
parents 78bd25b42d46
children a50ffe65911b
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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 says that implementations supporting the sem_*
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16 family of functions must indicate this by defining
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17 _POSIX_SEMAPHORES. */
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18 #ifdef _POSIX_SEMAPHORES
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19 #if _POSIX_SEMAPHORES == -1
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20 #define HAVE_BROKEN_POSIX_SEMAPHORES
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21 #else
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22 #include <semaphore.h>
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23 #include <errno.h>
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24 #endif
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25 #endif
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27 #if !defined(pthread_attr_default)
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28 # define pthread_attr_default ((pthread_attr_t *)NULL)
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29 #endif
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30 #if !defined(pthread_mutexattr_default)
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31 # define pthread_mutexattr_default ((pthread_mutexattr_t *)NULL)
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32 #endif
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33 #if !defined(pthread_condattr_default)
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34 # define pthread_condattr_default ((pthread_condattr_t *)NULL)
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35 #endif
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38 /* Whether or not to use semaphores directly rather than emulating them with
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39 * mutexes and condition variables:
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40 */
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41 #if defined(_POSIX_SEMAPHORES) && !defined(HAVE_BROKEN_POSIX_SEMAPHORES)
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42 # define USE_SEMAPHORES
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43 #else
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44 # undef USE_SEMAPHORES
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45 #endif
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47
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48 /* On platforms that don't use standard POSIX threads pthread_sigmask()
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49 * isn't present. DEC threads uses sigprocmask() instead as do most
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50 * other UNIX International compliant systems that don't have the full
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51 * pthread implementation.
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52 */
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53 #if defined(HAVE_PTHREAD_SIGMASK) && !defined(HAVE_BROKEN_PTHREAD_SIGMASK)
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54 # define SET_THREAD_SIGMASK pthread_sigmask
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55 #else
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56 # define SET_THREAD_SIGMASK sigprocmask
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57 #endif
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58
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60 /* A pthread mutex isn't sufficient to model the Python lock type
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61 * because, according to Draft 5 of the docs (P1003.4a/D5), both of the
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62 * following are undefined:
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63 * -> a thread tries to lock a mutex it already has locked
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64 * -> a thread tries to unlock a mutex locked by a different thread
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65 * pthread mutexes are designed for serializing threads over short pieces
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66 * of code anyway, so wouldn't be an appropriate implementation of
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67 * Python's locks regardless.
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68 *
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69 * The pthread_lock struct implements a Python lock as a "locked?" bit
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70 * and a <condition, mutex> pair. In general, if the bit can be acquired
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71 * instantly, it is, else the pair is used to block the thread until the
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72 * bit is cleared. 9 May 1994 tim@ksr.com
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73 */
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74
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75 typedef struct {
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76 char locked; /* 0=unlocked, 1=locked */
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77 /* a <cond, mutex> pair to handle an acquire of a locked lock */
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78 pthread_cond_t lock_released;
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79 pthread_mutex_t mut;
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80 } pthread_lock;
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82 #define CHECK_STATUS(name) if (status != 0) { perror(name); error = 1; }
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83
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84 /*
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85 * Initialization.
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86 */
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87
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88 #ifdef _HAVE_BSDI
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89 static
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90 void _noop(void)
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91 {
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92 }
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93
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94 static void
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95 PyThread__init_thread(void)
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96 {
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97 /* DO AN INIT BY STARTING THE THREAD */
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98 static int dummy = 0;
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99 pthread_t thread1;
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100 pthread_create(&thread1, NULL, (void *) _noop, &dummy);
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101 pthread_join(thread1, NULL);
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102 }
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103
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104 #else /* !_HAVE_BSDI */
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105
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106 static void
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107 PyThread__init_thread(void)
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108 {
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109 #if defined(_AIX) && defined(__GNUC__)
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110 pthread_init();
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111 #endif
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112 }
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113
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114 #endif /* !_HAVE_BSDI */
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115
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116 /*
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117 * Thread support.
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118 */
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119
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120
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121 long
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122 PyThread_start_new_thread(void (*func)(void *), void *arg)
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123 {
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124 pthread_t th;
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125 int status;
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126 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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127 pthread_attr_t attrs;
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128 #endif
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129 dprintf(("PyThread_start_new_thread called\n"));
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130 if (!initialized)
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131 PyThread_init_thread();
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132
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133 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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134 pthread_attr_init(&attrs);
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135 #endif
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136 #ifdef THREAD_STACK_SIZE
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137 pthread_attr_setstacksize(&attrs, THREAD_STACK_SIZE);
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138 #endif
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139 #if defined(PTHREAD_SYSTEM_SCHED_SUPPORTED) && !defined(__FreeBSD__)
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140 pthread_attr_setscope(&attrs, PTHREAD_SCOPE_SYSTEM);
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141 #endif
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142
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143 status = pthread_create(&th,
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144 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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145 &attrs,
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146 #else
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147 (pthread_attr_t*)NULL,
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148 #endif
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149 (void* (*)(void *))func,
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150 (void *)arg
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151 );
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152
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153 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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154 pthread_attr_destroy(&attrs);
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155 #endif
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156 if (status != 0)
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157 return -1;
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158
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159 pthread_detach(th);
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160
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161 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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162 return (long) th;
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163 #else
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164 return (long) *(long *) &th;
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165 #endif
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166 }
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167
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168 /* XXX This implementation is considered (to quote Tim Peters) "inherently
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169 hosed" because:
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170 - It does not guarantee the promise that a non-zero integer is returned.
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171 - The cast to long is inherently unsafe.
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172 - It is not clear that the 'volatile' (for AIX?) and ugly casting in the
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173 latter return statement (for Alpha OSF/1) are any longer necessary.
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174 */
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175 long
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176 PyThread_get_thread_ident(void)
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177 {
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178 volatile pthread_t threadid;
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179 if (!initialized)
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180 PyThread_init_thread();
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181 /* Jump through some hoops for Alpha OSF/1 */
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182 threadid = pthread_self();
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183 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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184 return (long) threadid;
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185 #else
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186 return (long) *(long *) &threadid;
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187 #endif
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188 }
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189
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190 static void
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191 do_PyThread_exit_thread(int no_cleanup)
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192 {
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193 dprintf(("PyThread_exit_thread called\n"));
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194 if (!initialized) {
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195 if (no_cleanup)
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196 _exit(0);
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197 else
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198 exit(0);
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199 }
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200 }
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201
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202 void
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203 PyThread_exit_thread(void)
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204 {
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205 do_PyThread_exit_thread(0);
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206 }
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207
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208 void
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209 PyThread__exit_thread(void)
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210 {
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211 do_PyThread_exit_thread(1);
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212 }
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213
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214 #ifndef NO_EXIT_PROG
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215 static void
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216 do_PyThread_exit_prog(int status, int no_cleanup)
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217 {
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218 dprintf(("PyThread_exit_prog(%d) called\n", status));
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219 if (!initialized)
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220 if (no_cleanup)
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221 _exit(status);
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222 else
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223 exit(status);
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224 }
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225
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226 void
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227 PyThread_exit_prog(int status)
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228 {
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229 do_PyThread_exit_prog(status, 0);
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230 }
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231
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232 void
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233 PyThread__exit_prog(int status)
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234 {
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235 do_PyThread_exit_prog(status, 1);
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236 }
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237 #endif /* NO_EXIT_PROG */
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238
22339
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239 #ifdef USE_SEMAPHORES
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240
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
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241 /*
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242 * Lock support.
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243 */
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244
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245 PyThread_type_lock
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246 PyThread_allocate_lock(void)
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247 {
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248 sem_t *lock;
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249 int status, error = 0;
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250
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251 dprintf(("PyThread_allocate_lock called\n"));
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252 if (!initialized)
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253 PyThread_init_thread();
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254
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255 lock = (sem_t *)malloc(sizeof(sem_t));
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256
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257 if (lock) {
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258 status = sem_init(lock,0,1);
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259 CHECK_STATUS("sem_init");
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260
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261 if (error) {
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262 free((void *)lock);
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263 lock = NULL;
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264 }
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265 }
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266
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267 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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268 return (PyThread_type_lock)lock;
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269 }
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270
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271 void
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272 PyThread_free_lock(PyThread_type_lock lock)
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273 {
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274 sem_t *thelock = (sem_t *)lock;
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275 int status, error = 0;
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276
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277 dprintf(("PyThread_free_lock(%p) called\n", lock));
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278
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279 if (!thelock)
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280 return;
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281
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282 status = sem_destroy(thelock);
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283 CHECK_STATUS("sem_destroy");
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284
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285 free((void *)thelock);
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286 }
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287
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288 /*
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289 * As of February 2002, Cygwin thread implementations mistakenly report error
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290 * codes in the return value of the sem_ calls (like the pthread_ functions).
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291 * Correct implementations return -1 and put the code in errno. This supports
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292 * either.
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293 */
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294 static int
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295 fix_status(int status)
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296 {
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297 return (status == -1) ? errno : status;
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298 }
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299
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300 int
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301 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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302 {
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303 int success;
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304 sem_t *thelock = (sem_t *)lock;
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305 int status, error = 0;
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306
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307 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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308
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309 do {
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310 if (waitflag)
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311 status = fix_status(sem_wait(thelock));
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312 else
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313 status = fix_status(sem_trywait(thelock));
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314 } while (status == EINTR); /* Retry if interrupted by a signal */
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315
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316 if (waitflag) {
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317 CHECK_STATUS("sem_wait");
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318 } else if (status != EAGAIN) {
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319 CHECK_STATUS("sem_trywait");
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320 }
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321
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322 success = (status == 0) ? 1 : 0;
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323
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324 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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325 return success;
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326 }
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327
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328 void
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329 PyThread_release_lock(PyThread_type_lock lock)
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330 {
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331 sem_t *thelock = (sem_t *)lock;
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332 int status, error = 0;
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333
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334 dprintf(("PyThread_release_lock(%p) called\n", lock));
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335
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336 status = sem_post(thelock);
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337 CHECK_STATUS("sem_post");
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338 }
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339
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340 #else /* USE_SEMAPHORES */
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341
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342 /*
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343 * Lock support.
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344 */
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345 PyThread_type_lock
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346 PyThread_allocate_lock(void)
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347 {
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348 pthread_lock *lock;
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349 int status, error = 0;
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350
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351 dprintf(("PyThread_allocate_lock called\n"));
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352 if (!initialized)
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353 PyThread_init_thread();
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354
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355 lock = (pthread_lock *) malloc(sizeof(pthread_lock));
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356 memset((void *)lock, '\0', sizeof(pthread_lock));
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357 if (lock) {
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358 lock->locked = 0;
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359
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360 status = pthread_mutex_init(&lock->mut,
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361 pthread_mutexattr_default);
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362 CHECK_STATUS("pthread_mutex_init");
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363
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364 status = pthread_cond_init(&lock->lock_released,
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365 pthread_condattr_default);
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366 CHECK_STATUS("pthread_cond_init");
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367
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368 if (error) {
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369 free((void *)lock);
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370 lock = 0;
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371 }
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372 }
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373
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374 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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375 return (PyThread_type_lock) lock;
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376 }
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377
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378 void
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379 PyThread_free_lock(PyThread_type_lock lock)
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380 {
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381 pthread_lock *thelock = (pthread_lock *)lock;
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382 int status, error = 0;
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383
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384 dprintf(("PyThread_free_lock(%p) called\n", lock));
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385
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386 status = pthread_mutex_destroy( &thelock->mut );
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387 CHECK_STATUS("pthread_mutex_destroy");
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388
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389 status = pthread_cond_destroy( &thelock->lock_released );
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390 CHECK_STATUS("pthread_cond_destroy");
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391
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392 free((void *)thelock);
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393 }
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394
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395 int
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396 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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397 {
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398 int success;
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399 pthread_lock *thelock = (pthread_lock *)lock;
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400 int status, error = 0;
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401
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402 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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403
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404 status = pthread_mutex_lock( &thelock->mut );
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405 CHECK_STATUS("pthread_mutex_lock[1]");
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406 success = thelock->locked == 0;
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407
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408 if ( !success && waitflag ) {
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409 /* continue trying until we get the lock */
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410
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411 /* mut must be locked by me -- part of the condition
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412 * protocol */
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413 while ( thelock->locked ) {
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414 status = pthread_cond_wait(&thelock->lock_released,
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415 &thelock->mut);
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416 CHECK_STATUS("pthread_cond_wait");
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417 }
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418 success = 1;
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419 }
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420 if (success) thelock->locked = 1;
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421 status = pthread_mutex_unlock( &thelock->mut );
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422 CHECK_STATUS("pthread_mutex_unlock[1]");
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423
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424 if (error) success = 0;
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425 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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426 return success;
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427 }
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428
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429 void
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430 PyThread_release_lock(PyThread_type_lock lock)
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431 {
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432 pthread_lock *thelock = (pthread_lock *)lock;
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433 int status, error = 0;
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434
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435 dprintf(("PyThread_release_lock(%p) called\n", lock));
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436
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437 status = pthread_mutex_lock( &thelock->mut );
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438 CHECK_STATUS("pthread_mutex_lock[3]");
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439
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440 thelock->locked = 0;
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441
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442 status = pthread_mutex_unlock( &thelock->mut );
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443 CHECK_STATUS("pthread_mutex_unlock[3]");
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444
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445 /* wake up someone (anyone, if any) waiting on the lock */
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446 status = pthread_cond_signal( &thelock->lock_released );
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447 CHECK_STATUS("pthread_cond_signal");
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448 }
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449
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450 #endif /* USE_SEMAPHORES */