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annotate Python/thread_pthread.h @ 34123:4e8fb12f8378 legacy-trunk

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Put parentheses around the assignment in the 'while' loop conditional expression in min_max() to shut gcc up.
author Brett Cannon <bcannon@gmail.com>
date Tue, 07 Dec 2004 00:25:35 +0000
parents 78bd25b42d46
children fcb507414c41
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 #if defined(__APPLE__) || defined(HAVE_PTHREAD_DESTRUCTOR)
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7 #define destructor xxdestructor
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8 #endif
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9 #include <pthread.h>
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10 #if defined(__APPLE__) || defined(HAVE_PTHREAD_DESTRUCTOR)
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11 #undef destructor
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12 #endif
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13 #include <signal.h>
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15 /* The POSIX spec says that implementations supporting the sem_*
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16 family of functions must indicate this by defining
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17 _POSIX_SEMAPHORES. */
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18 #ifdef _POSIX_SEMAPHORES
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19 #include <semaphore.h>
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20 #include <errno.h>
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21 #endif
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23 #if !defined(pthread_attr_default)
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24 # define pthread_attr_default ((pthread_attr_t *)NULL)
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25 #endif
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26 #if !defined(pthread_mutexattr_default)
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27 # define pthread_mutexattr_default ((pthread_mutexattr_t *)NULL)
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28 #endif
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29 #if !defined(pthread_condattr_default)
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30 # define pthread_condattr_default ((pthread_condattr_t *)NULL)
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31 #endif
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34 /* Whether or not to use semaphores directly rather than emulating them with
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35 * mutexes and condition variables:
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36 */
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37 #if defined(_POSIX_SEMAPHORES) && !defined(HAVE_BROKEN_POSIX_SEMAPHORES)
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38 # define USE_SEMAPHORES
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39 #else
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40 # undef USE_SEMAPHORES
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41 #endif
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44 /* On platforms that don't use standard POSIX threads pthread_sigmask()
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45 * isn't present. DEC threads uses sigprocmask() instead as do most
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46 * other UNIX International compliant systems that don't have the full
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47 * pthread implementation.
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48 */
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49 #if defined(HAVE_PTHREAD_SIGMASK) && !defined(HAVE_BROKEN_PTHREAD_SIGMASK)
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50 # define SET_THREAD_SIGMASK pthread_sigmask
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51 #else
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52 # define SET_THREAD_SIGMASK sigprocmask
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53 #endif
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54
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56 /* A pthread mutex isn't sufficient to model the Python lock type
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57 * because, according to Draft 5 of the docs (P1003.4a/D5), both of the
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58 * following are undefined:
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59 * -> a thread tries to lock a mutex it already has locked
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60 * -> a thread tries to unlock a mutex locked by a different thread
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61 * pthread mutexes are designed for serializing threads over short pieces
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62 * of code anyway, so wouldn't be an appropriate implementation of
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63 * Python's locks regardless.
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64 *
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65 * The pthread_lock struct implements a Python lock as a "locked?" bit
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66 * and a <condition, mutex> pair. In general, if the bit can be acquired
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67 * instantly, it is, else the pair is used to block the thread until the
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68 * bit is cleared. 9 May 1994 tim@ksr.com
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69 */
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70
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71 typedef struct {
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72 char locked; /* 0=unlocked, 1=locked */
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73 /* a <cond, mutex> pair to handle an acquire of a locked lock */
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74 pthread_cond_t lock_released;
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75 pthread_mutex_t mut;
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76 } pthread_lock;
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77
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78 #define CHECK_STATUS(name) if (status != 0) { perror(name); error = 1; }
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79
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80 /*
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81 * Initialization.
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82 */
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83
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84 #ifdef _HAVE_BSDI
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85 static
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86 void _noop(void)
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87 {
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88 }
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89
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90 static void
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91 PyThread__init_thread(void)
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92 {
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93 /* DO AN INIT BY STARTING THE THREAD */
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94 static int dummy = 0;
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95 pthread_t thread1;
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96 pthread_create(&thread1, NULL, (void *) _noop, &dummy);
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97 pthread_join(thread1, NULL);
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98 }
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99
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100 #else /* !_HAVE_BSDI */
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101
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102 static void
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103 PyThread__init_thread(void)
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104 {
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105 #if defined(_AIX) && defined(__GNUC__)
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106 pthread_init();
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107 #endif
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108 }
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109
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110 #endif /* !_HAVE_BSDI */
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111
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112 /*
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113 * Thread support.
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114 */
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115
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116
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117 long
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118 PyThread_start_new_thread(void (*func)(void *), void *arg)
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119 {
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120 pthread_t th;
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121 int status;
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122 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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123 pthread_attr_t attrs;
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124 #endif
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125 dprintf(("PyThread_start_new_thread called\n"));
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126 if (!initialized)
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127 PyThread_init_thread();
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128
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129 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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130 pthread_attr_init(&attrs);
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131 #endif
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132 #ifdef THREAD_STACK_SIZE
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133 pthread_attr_setstacksize(&attrs, THREAD_STACK_SIZE);
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134 #endif
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135 #if defined(PTHREAD_SYSTEM_SCHED_SUPPORTED) && !defined(__FreeBSD__)
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136 pthread_attr_setscope(&attrs, PTHREAD_SCOPE_SYSTEM);
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137 #endif
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138
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139 status = pthread_create(&th,
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140 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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141 &attrs,
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142 #else
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143 (pthread_attr_t*)NULL,
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144 #endif
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145 (void* (*)(void *))func,
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146 (void *)arg
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147 );
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148
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149 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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150 pthread_attr_destroy(&attrs);
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151 #endif
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152 if (status != 0)
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153 return -1;
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154
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155 pthread_detach(th);
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156
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157 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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158 return (long) th;
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159 #else
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160 return (long) *(long *) &th;
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161 #endif
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162 }
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163
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164 /* XXX This implementation is considered (to quote Tim Peters) "inherently
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165 hosed" because:
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166 - It does not guarantee the promise that a non-zero integer is returned.
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167 - The cast to long is inherently unsafe.
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168 - It is not clear that the 'volatile' (for AIX?) and ugly casting in the
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169 latter return statement (for Alpha OSF/1) are any longer necessary.
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170 */
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171 long
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172 PyThread_get_thread_ident(void)
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173 {
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174 volatile pthread_t threadid;
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175 if (!initialized)
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176 PyThread_init_thread();
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177 /* Jump through some hoops for Alpha OSF/1 */
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178 threadid = pthread_self();
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179 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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180 return (long) threadid;
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181 #else
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182 return (long) *(long *) &threadid;
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183 #endif
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184 }
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185
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186 static void
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187 do_PyThread_exit_thread(int no_cleanup)
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188 {
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189 dprintf(("PyThread_exit_thread called\n"));
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190 if (!initialized) {
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191 if (no_cleanup)
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192 _exit(0);
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193 else
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194 exit(0);
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195 }
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196 }
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197
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198 void
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199 PyThread_exit_thread(void)
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200 {
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201 do_PyThread_exit_thread(0);
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202 }
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203
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204 void
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205 PyThread__exit_thread(void)
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206 {
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207 do_PyThread_exit_thread(1);
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208 }
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209
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210 #ifndef NO_EXIT_PROG
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211 static void
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212 do_PyThread_exit_prog(int status, int no_cleanup)
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213 {
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214 dprintf(("PyThread_exit_prog(%d) called\n", status));
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215 if (!initialized)
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216 if (no_cleanup)
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217 _exit(status);
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218 else
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219 exit(status);
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220 }
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221
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222 void
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223 PyThread_exit_prog(int status)
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224 {
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225 do_PyThread_exit_prog(status, 0);
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226 }
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227
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228 void
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229 PyThread__exit_prog(int status)
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230 {
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231 do_PyThread_exit_prog(status, 1);
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232 }
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233 #endif /* NO_EXIT_PROG */
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234
22339
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235 #ifdef USE_SEMAPHORES
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236
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
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237 /*
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238 * Lock support.
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239 */
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240
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241 PyThread_type_lock
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242 PyThread_allocate_lock(void)
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243 {
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244 sem_t *lock;
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245 int status, error = 0;
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246
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247 dprintf(("PyThread_allocate_lock called\n"));
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248 if (!initialized)
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249 PyThread_init_thread();
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250
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251 lock = (sem_t *)malloc(sizeof(sem_t));
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252
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253 if (lock) {
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254 status = sem_init(lock,0,1);
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255 CHECK_STATUS("sem_init");
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256
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257 if (error) {
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258 free((void *)lock);
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259 lock = NULL;
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260 }
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261 }
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262
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263 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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264 return (PyThread_type_lock)lock;
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265 }
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266
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267 void
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268 PyThread_free_lock(PyThread_type_lock lock)
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269 {
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270 sem_t *thelock = (sem_t *)lock;
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271 int status, error = 0;
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272
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273 dprintf(("PyThread_free_lock(%p) called\n", lock));
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274
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275 if (!thelock)
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276 return;
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277
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278 status = sem_destroy(thelock);
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279 CHECK_STATUS("sem_destroy");
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280
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281 free((void *)thelock);
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282 }
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283
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284 /*
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285 * As of February 2002, Cygwin thread implementations mistakenly report error
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286 * codes in the return value of the sem_ calls (like the pthread_ functions).
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287 * Correct implementations return -1 and put the code in errno. This supports
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288 * either.
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289 */
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290 static int
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291 fix_status(int status)
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292 {
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293 return (status == -1) ? errno : status;
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294 }
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295
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296 int
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297 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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298 {
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299 int success;
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300 sem_t *thelock = (sem_t *)lock;
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301 int status, error = 0;
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302
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303 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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304
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305 do {
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306 if (waitflag)
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307 status = fix_status(sem_wait(thelock));
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308 else
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309 status = fix_status(sem_trywait(thelock));
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310 } while (status == EINTR); /* Retry if interrupted by a signal */
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311
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312 if (waitflag) {
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313 CHECK_STATUS("sem_wait");
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314 } else if (status != EAGAIN) {
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315 CHECK_STATUS("sem_trywait");
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316 }
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317
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318 success = (status == 0) ? 1 : 0;
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319
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320 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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321 return success;
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322 }
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323
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324 void
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325 PyThread_release_lock(PyThread_type_lock lock)
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326 {
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327 sem_t *thelock = (sem_t *)lock;
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328 int status, error = 0;
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329
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330 dprintf(("PyThread_release_lock(%p) called\n", lock));
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331
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332 status = sem_post(thelock);
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333 CHECK_STATUS("sem_post");
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334 }
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335
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336 #else /* USE_SEMAPHORES */
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337
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338 /*
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339 * Lock support.
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340 */
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341 PyThread_type_lock
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342 PyThread_allocate_lock(void)
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343 {
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344 pthread_lock *lock;
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345 int status, error = 0;
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346
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347 dprintf(("PyThread_allocate_lock called\n"));
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348 if (!initialized)
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349 PyThread_init_thread();
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350
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351 lock = (pthread_lock *) malloc(sizeof(pthread_lock));
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352 memset((void *)lock, '\0', sizeof(pthread_lock));
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353 if (lock) {
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354 lock->locked = 0;
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355
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356 status = pthread_mutex_init(&lock->mut,
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357 pthread_mutexattr_default);
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358 CHECK_STATUS("pthread_mutex_init");
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359
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360 status = pthread_cond_init(&lock->lock_released,
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361 pthread_condattr_default);
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362 CHECK_STATUS("pthread_cond_init");
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363
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364 if (error) {
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365 free((void *)lock);
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366 lock = 0;
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367 }
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368 }
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369
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370 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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371 return (PyThread_type_lock) lock;
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372 }
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373
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374 void
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375 PyThread_free_lock(PyThread_type_lock lock)
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376 {
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377 pthread_lock *thelock = (pthread_lock *)lock;
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378 int status, error = 0;
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379
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380 dprintf(("PyThread_free_lock(%p) called\n", lock));
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381
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382 status = pthread_mutex_destroy( &thelock->mut );
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383 CHECK_STATUS("pthread_mutex_destroy");
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384
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385 status = pthread_cond_destroy( &thelock->lock_released );
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386 CHECK_STATUS("pthread_cond_destroy");
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387
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388 free((void *)thelock);
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389 }
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390
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391 int
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392 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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393 {
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394 int success;
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395 pthread_lock *thelock = (pthread_lock *)lock;
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396 int status, error = 0;
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397
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398 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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399
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400 status = pthread_mutex_lock( &thelock->mut );
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401 CHECK_STATUS("pthread_mutex_lock[1]");
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402 success = thelock->locked == 0;
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403
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404 if ( !success && waitflag ) {
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405 /* continue trying until we get the lock */
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406
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407 /* mut must be locked by me -- part of the condition
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408 * protocol */
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409 while ( thelock->locked ) {
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410 status = pthread_cond_wait(&thelock->lock_released,
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411 &thelock->mut);
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412 CHECK_STATUS("pthread_cond_wait");
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413 }
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414 success = 1;
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415 }
28673
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416 if (success) thelock->locked = 1;
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417 status = pthread_mutex_unlock( &thelock->mut );
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418 CHECK_STATUS("pthread_mutex_unlock[1]");
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419
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420 if (error) success = 0;
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421 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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422 return success;
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423 }
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424
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diff changeset
425 void
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426 PyThread_release_lock(PyThread_type_lock lock)
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427 {
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428 pthread_lock *thelock = (pthread_lock *)lock;
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429 int status, error = 0;
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430
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431 dprintf(("PyThread_release_lock(%p) called\n", lock));
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432
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433 status = pthread_mutex_lock( &thelock->mut );
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434 CHECK_STATUS("pthread_mutex_lock[3]");
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435
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436 thelock->locked = 0;
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437
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438 status = pthread_mutex_unlock( &thelock->mut );
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439 CHECK_STATUS("pthread_mutex_unlock[3]");
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440
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441 /* wake up someone (anyone, if any) waiting on the lock */
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442 status = pthread_cond_signal( &thelock->lock_released );
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443 CHECK_STATUS("pthread_cond_signal");
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444 }
22339
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
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445
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446 #endif /* USE_SEMAPHORES */