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SF bug 1061968: threads: segfault or Py_FatalError at exit PyGILState_Ensure(): The fix in 2.4a3 for bug 1010677 reintroduced thread shutdown race bug 225673. Repaired by (once again) ensuring the GIL is held whenever deleting a thread state. Alas, there's no useful test case for this shy bug. Four years ago, only Guido could provoke it, on his box, and today only Armin can provoke it on his box. I've never been able to provoke it (but not for lack of trying!). This is a critical fix for 2.3.5 too, since the fix for 1010677 got backported there already and so also reintroduced 225673. I don't intend to backport this fix. For whoever (if anyone) does, there are other thread fixes in 2.4 that need backporting too, and I bet they need to happen first for this patch to apply cleanly.
author Tim Peters <tim.peters@gmail.com>
date Mon, 08 Nov 2004 04:30:21 +0000
parents 78bd25b42d46
children fcb507414c41
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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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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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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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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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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
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
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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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parents: 10400
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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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Fred Drake <fdrake@acm.org>
parents: 10400
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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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diff changeset
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
c1ba50790c83 Patch #711835: Remove unnecessary lock operations. Will backport to 2.2.
Martin v. Löwis <martin@v.loewis.de>
parents: 27320
diff changeset
416 if (success) thelock->locked = 1;
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parents: 27320
diff changeset
417 status = pthread_mutex_unlock( &thelock->mut );
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parents: 27320
diff changeset
418 CHECK_STATUS("pthread_mutex_unlock[1]");
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parents: 27320
diff changeset
419
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420 if (error) success = 0;
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Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
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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f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
425 void
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
426 PyThread_release_lock(PyThread_type_lock lock)
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diff changeset
427 {
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parents: 1628
diff changeset
428 pthread_lock *thelock = (pthread_lock *)lock;
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parents: 1628
diff changeset
429 int status, error = 0;
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parents: 1628
diff changeset
430
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Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
431 dprintf(("PyThread_release_lock(%p) called\n", lock));
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parents: 1628
diff changeset
432
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diff changeset
433 status = pthread_mutex_lock( &thelock->mut );
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diff changeset
434 CHECK_STATUS("pthread_mutex_lock[3]");
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parents:
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435
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diff changeset
436 thelock->locked = 0;
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diff changeset
437
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diff changeset
438 status = pthread_mutex_unlock( &thelock->mut );
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parents: 1628
diff changeset
439 CHECK_STATUS("pthread_mutex_unlock[3]");
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parents: 1628
diff changeset
440
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parents: 1628
diff changeset
441 /* wake up someone (anyone, if any) waiting on the lock */
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diff changeset
442 status = pthread_cond_signal( &thelock->lock_released );
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diff changeset
443 CHECK_STATUS("pthread_cond_signal");
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444 }
22339
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
445
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
446 #endif /* USE_SEMAPHORES */