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annotate Python/thread_pthread.h @ 31606:fd2103ae6f29 legacy-trunk

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Add pystack definition to Misc/gdbinit with some explanation of its behavior and add flag comments to ceval.c and main.c alerting people to the coupling between pystack and the layout of those files.
author Skip Montanaro <skip@pobox.com>
date Mon, 01 Mar 2004 15:44:05 +0000
parents 66e43f25046d
children 0979fa062deb
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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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 sigset_t oldmask, newmask;
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123 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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124 pthread_attr_t attrs;
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125 #endif
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126 dprintf(("PyThread_start_new_thread called\n"));
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127 if (!initialized)
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128 PyThread_init_thread();
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129
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130 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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131 pthread_attr_init(&attrs);
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132 #endif
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133 #ifdef THREAD_STACK_SIZE
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134 pthread_attr_setstacksize(&attrs, THREAD_STACK_SIZE);
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135 #endif
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136 #ifdef PTHREAD_SYSTEM_SCHED_SUPPORTED
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137 pthread_attr_setscope(&attrs, PTHREAD_SCOPE_SYSTEM);
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138 #endif
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139
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140 /* Mask all signals in the current thread before creating the new
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141 * thread. This causes the new thread to start with all signals
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142 * blocked.
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143 */
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144 sigfillset(&newmask);
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145 SET_THREAD_SIGMASK(SIG_BLOCK, &newmask, &oldmask);
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146
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147 status = pthread_create(&th,
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148 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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149 &attrs,
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150 #else
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151 (pthread_attr_t*)NULL,
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152 #endif
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153 (void* (*)(void *))func,
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154 (void *)arg
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155 );
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156
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157 /* Restore signal mask for original thread */
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158 SET_THREAD_SIGMASK(SIG_SETMASK, &oldmask, NULL);
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159
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160 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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161 pthread_attr_destroy(&attrs);
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162 #endif
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163 if (status != 0)
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164 return -1;
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165
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166 pthread_detach(th);
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167
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168 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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169 return (long) th;
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170 #else
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171 return (long) *(long *) &th;
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172 #endif
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173 }
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174
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175 /* XXX This implementation is considered (to quote Tim Peters) "inherently
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176 hosed" because:
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177 - It does not guanrantee the promise that a non-zero integer is returned.
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178 - The cast to long is inherently unsafe.
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179 - It is not clear that the 'volatile' (for AIX?) and ugly casting in the
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180 latter return statement (for Alpha OSF/1) are any longer necessary.
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181 */
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182 long
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183 PyThread_get_thread_ident(void)
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184 {
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185 volatile pthread_t threadid;
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186 if (!initialized)
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187 PyThread_init_thread();
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188 /* Jump through some hoops for Alpha OSF/1 */
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189 threadid = pthread_self();
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190 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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191 return (long) threadid;
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192 #else
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193 return (long) *(long *) &threadid;
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194 #endif
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195 }
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196
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197 static void
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198 do_PyThread_exit_thread(int no_cleanup)
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199 {
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200 dprintf(("PyThread_exit_thread called\n"));
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201 if (!initialized) {
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202 if (no_cleanup)
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203 _exit(0);
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204 else
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205 exit(0);
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206 }
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207 }
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208
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209 void
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210 PyThread_exit_thread(void)
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211 {
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212 do_PyThread_exit_thread(0);
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213 }
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214
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215 void
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216 PyThread__exit_thread(void)
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217 {
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218 do_PyThread_exit_thread(1);
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219 }
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220
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221 #ifndef NO_EXIT_PROG
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222 static void
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223 do_PyThread_exit_prog(int status, int no_cleanup)
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224 {
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225 dprintf(("PyThread_exit_prog(%d) called\n", status));
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226 if (!initialized)
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227 if (no_cleanup)
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228 _exit(status);
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229 else
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230 exit(status);
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231 }
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232
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233 void
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234 PyThread_exit_prog(int status)
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235 {
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236 do_PyThread_exit_prog(status, 0);
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237 }
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238
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239 void
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240 PyThread__exit_prog(int status)
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241 {
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242 do_PyThread_exit_prog(status, 1);
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243 }
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244 #endif /* NO_EXIT_PROG */
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245
22339
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246 #ifdef USE_SEMAPHORES
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247
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
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248 /*
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249 * Lock support.
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250 */
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251
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252 PyThread_type_lock
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253 PyThread_allocate_lock(void)
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254 {
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255 sem_t *lock;
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256 int status, error = 0;
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257
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258 dprintf(("PyThread_allocate_lock called\n"));
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259 if (!initialized)
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260 PyThread_init_thread();
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261
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262 lock = (sem_t *)malloc(sizeof(sem_t));
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263
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264 if (lock) {
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265 status = sem_init(lock,0,1);
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266 CHECK_STATUS("sem_init");
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267
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268 if (error) {
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269 free((void *)lock);
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270 lock = NULL;
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271 }
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272 }
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273
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274 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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275 return (PyThread_type_lock)lock;
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276 }
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277
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278 void
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279 PyThread_free_lock(PyThread_type_lock lock)
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280 {
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281 sem_t *thelock = (sem_t *)lock;
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282 int status, error = 0;
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283
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284 dprintf(("PyThread_free_lock(%p) called\n", lock));
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285
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286 if (!thelock)
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287 return;
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288
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289 status = sem_destroy(thelock);
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290 CHECK_STATUS("sem_destroy");
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291
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292 free((void *)thelock);
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293 }
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294
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295 /*
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296 * As of February 2002, Cygwin thread implementations mistakenly report error
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297 * codes in the return value of the sem_ calls (like the pthread_ functions).
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298 * Correct implementations return -1 and put the code in errno. This supports
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299 * either.
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300 */
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301 static int
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302 fix_status(int status)
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303 {
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304 return (status == -1) ? errno : status;
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305 }
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306
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307 int
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308 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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309 {
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310 int success;
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311 sem_t *thelock = (sem_t *)lock;
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312 int status, error = 0;
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313
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314 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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315
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316 do {
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317 if (waitflag)
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318 status = fix_status(sem_wait(thelock));
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319 else
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320 status = fix_status(sem_trywait(thelock));
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321 } while (status == EINTR); /* Retry if interrupted by a signal */
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322
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323 if (waitflag) {
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324 CHECK_STATUS("sem_wait");
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325 } else if (status != EAGAIN) {
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326 CHECK_STATUS("sem_trywait");
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327 }
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328
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329 success = (status == 0) ? 1 : 0;
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330
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331 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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332 return success;
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333 }
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334
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335 void
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336 PyThread_release_lock(PyThread_type_lock lock)
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337 {
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338 sem_t *thelock = (sem_t *)lock;
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339 int status, error = 0;
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340
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341 dprintf(("PyThread_release_lock(%p) called\n", lock));
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342
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343 status = sem_post(thelock);
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344 CHECK_STATUS("sem_post");
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345 }
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346
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347 #else /* USE_SEMAPHORES */
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348
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349 /*
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350 * Lock support.
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351 */
13658
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352 PyThread_type_lock
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353 PyThread_allocate_lock(void)
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354 {
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355 pthread_lock *lock;
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356 int status, error = 0;
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357
9679
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358 dprintf(("PyThread_allocate_lock called\n"));
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359 if (!initialized)
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360 PyThread_init_thread();
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361
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362 lock = (pthread_lock *) malloc(sizeof(pthread_lock));
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363 memset((void *)lock, '\0', sizeof(pthread_lock));
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364 if (lock) {
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365 lock->locked = 0;
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366
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367 status = pthread_mutex_init(&lock->mut,
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368 pthread_mutexattr_default);
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369 CHECK_STATUS("pthread_mutex_init");
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370
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371 status = pthread_cond_init(&lock->lock_released,
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372 pthread_condattr_default);
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373 CHECK_STATUS("pthread_cond_init");
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374
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375 if (error) {
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376 free((void *)lock);
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377 lock = 0;
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378 }
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379 }
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380
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381 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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382 return (PyThread_type_lock) lock;
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383 }
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384
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385 void
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386 PyThread_free_lock(PyThread_type_lock lock)
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387 {
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388 pthread_lock *thelock = (pthread_lock *)lock;
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389 int status, error = 0;
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390
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391 dprintf(("PyThread_free_lock(%p) called\n", lock));
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392
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393 status = pthread_mutex_destroy( &thelock->mut );
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394 CHECK_STATUS("pthread_mutex_destroy");
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395
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396 status = pthread_cond_destroy( &thelock->lock_released );
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397 CHECK_STATUS("pthread_cond_destroy");
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398
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399 free((void *)thelock);
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400 }
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401
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402 int
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403 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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404 {
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405 int success;
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406 pthread_lock *thelock = (pthread_lock *)lock;
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407 int status, error = 0;
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408
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409 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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410
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411 status = pthread_mutex_lock( &thelock->mut );
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412 CHECK_STATUS("pthread_mutex_lock[1]");
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413 success = thelock->locked == 0;
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414
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415 if ( !success && waitflag ) {
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416 /* continue trying until we get the lock */
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417
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418 /* mut must be locked by me -- part of the condition
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419 * protocol */
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420 while ( thelock->locked ) {
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421 status = pthread_cond_wait(&thelock->lock_released,
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422 &thelock->mut);
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423 CHECK_STATUS("pthread_cond_wait");
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424 }
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425 success = 1;
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426 }
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427 if (success) thelock->locked = 1;
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428 status = pthread_mutex_unlock( &thelock->mut );
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429 CHECK_STATUS("pthread_mutex_unlock[1]");
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430
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431 if (error) success = 0;
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432 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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433 return success;
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434 }
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435
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436 void
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437 PyThread_release_lock(PyThread_type_lock lock)
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438 {
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439 pthread_lock *thelock = (pthread_lock *)lock;
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440 int status, error = 0;
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441
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442 dprintf(("PyThread_release_lock(%p) called\n", lock));
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443
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444 status = pthread_mutex_lock( &thelock->mut );
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445 CHECK_STATUS("pthread_mutex_lock[3]");
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446
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447 thelock->locked = 0;
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448
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449 status = pthread_mutex_unlock( &thelock->mut );
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450 CHECK_STATUS("pthread_mutex_unlock[3]");
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451
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452 /* wake up someone (anyone, if any) waiting on the lock */
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453 status = pthread_cond_signal( &thelock->lock_released );
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454 CHECK_STATUS("pthread_cond_signal");
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455 }
22339
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
456
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diff changeset
457 #endif /* USE_SEMAPHORES */