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annotate Python/thread_pthread.h @ 35752:47496e7dbf2f legacy-trunk

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Fix SF bug #1167751, Argument genexp corner case Incorrect code was generated for: foo(a = i for i in range(10)) This should have generated a SyntaxError. Fix the Grammar so it raises a SyntaxError and test it. I'm uncertain whether this should be backported. It makes something that was Syntactically valid invalid. However, the code would either be completely broken or do the wrong thing.
author Neal Norwitz <nnorwitz@gmail.com>
date Fri, 21 Oct 2005 06:24:02 +0000
parents 5a8bf8e7d010
children 4f97b6a229ce
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 /* On FreeBSD 4.x, _POSIX_SEMAPHORES is defined empty, so
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20 we need to add 0 to make it work there as well. */
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21 #if (_POSIX_SEMAPHORES+0) == -1
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22 #define HAVE_BROKEN_POSIX_SEMAPHORES
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23 #else
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24 #include <semaphore.h>
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25 #include <errno.h>
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26 #endif
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27 #endif
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29 #if !defined(pthread_attr_default)
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30 # define pthread_attr_default ((pthread_attr_t *)NULL)
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31 #endif
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32 #if !defined(pthread_mutexattr_default)
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33 # define pthread_mutexattr_default ((pthread_mutexattr_t *)NULL)
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34 #endif
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35 #if !defined(pthread_condattr_default)
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36 # define pthread_condattr_default ((pthread_condattr_t *)NULL)
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37 #endif
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40 /* Whether or not to use semaphores directly rather than emulating them with
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41 * mutexes and condition variables:
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42 */
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43 #if defined(_POSIX_SEMAPHORES) && !defined(HAVE_BROKEN_POSIX_SEMAPHORES)
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44 # define USE_SEMAPHORES
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45 #else
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46 # undef USE_SEMAPHORES
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47 #endif
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50 /* On platforms that don't use standard POSIX threads pthread_sigmask()
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51 * isn't present. DEC threads uses sigprocmask() instead as do most
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52 * other UNIX International compliant systems that don't have the full
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53 * pthread implementation.
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54 */
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55 #if defined(HAVE_PTHREAD_SIGMASK) && !defined(HAVE_BROKEN_PTHREAD_SIGMASK)
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56 # define SET_THREAD_SIGMASK pthread_sigmask
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57 #else
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58 # define SET_THREAD_SIGMASK sigprocmask
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59 #endif
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62 /* A pthread mutex isn't sufficient to model the Python lock type
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63 * because, according to Draft 5 of the docs (P1003.4a/D5), both of the
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64 * following are undefined:
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65 * -> a thread tries to lock a mutex it already has locked
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66 * -> a thread tries to unlock a mutex locked by a different thread
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67 * pthread mutexes are designed for serializing threads over short pieces
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68 * of code anyway, so wouldn't be an appropriate implementation of
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69 * Python's locks regardless.
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70 *
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71 * The pthread_lock struct implements a Python lock as a "locked?" bit
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72 * and a <condition, mutex> pair. In general, if the bit can be acquired
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73 * instantly, it is, else the pair is used to block the thread until the
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74 * bit is cleared. 9 May 1994 tim@ksr.com
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75 */
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76
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77 typedef struct {
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78 char locked; /* 0=unlocked, 1=locked */
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79 /* a <cond, mutex> pair to handle an acquire of a locked lock */
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80 pthread_cond_t lock_released;
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81 pthread_mutex_t mut;
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82 } pthread_lock;
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84 #define CHECK_STATUS(name) if (status != 0) { perror(name); error = 1; }
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85
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86 /*
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87 * Initialization.
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88 */
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89
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90 #ifdef _HAVE_BSDI
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91 static
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92 void _noop(void)
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93 {
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94 }
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95
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96 static void
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97 PyThread__init_thread(void)
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98 {
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99 /* DO AN INIT BY STARTING THE THREAD */
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100 static int dummy = 0;
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101 pthread_t thread1;
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102 pthread_create(&thread1, NULL, (void *) _noop, &dummy);
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103 pthread_join(thread1, NULL);
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104 }
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105
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106 #else /* !_HAVE_BSDI */
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107
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108 static void
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109 PyThread__init_thread(void)
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110 {
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111 #if defined(_AIX) && defined(__GNUC__)
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112 pthread_init();
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113 #endif
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114 }
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115
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116 #endif /* !_HAVE_BSDI */
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117
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118 /*
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119 * Thread support.
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120 */
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121
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122
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123 long
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124 PyThread_start_new_thread(void (*func)(void *), void *arg)
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125 {
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126 pthread_t th;
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127 int status;
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128 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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129 pthread_attr_t attrs;
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130 #endif
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131 dprintf(("PyThread_start_new_thread called\n"));
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132 if (!initialized)
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133 PyThread_init_thread();
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134
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135 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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136 pthread_attr_init(&attrs);
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137 #endif
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138 #ifdef THREAD_STACK_SIZE
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139 pthread_attr_setstacksize(&attrs, THREAD_STACK_SIZE);
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140 #endif
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141 #if defined(PTHREAD_SYSTEM_SCHED_SUPPORTED) && !defined(__FreeBSD__)
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142 pthread_attr_setscope(&attrs, PTHREAD_SCOPE_SYSTEM);
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143 #endif
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144
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145 status = pthread_create(&th,
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146 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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147 &attrs,
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148 #else
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149 (pthread_attr_t*)NULL,
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150 #endif
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151 (void* (*)(void *))func,
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152 (void *)arg
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153 );
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154
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155 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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156 pthread_attr_destroy(&attrs);
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157 #endif
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158 if (status != 0)
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159 return -1;
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160
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161 pthread_detach(th);
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162
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163 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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164 return (long) th;
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165 #else
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166 return (long) *(long *) &th;
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167 #endif
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168 }
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169
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170 /* XXX This implementation is considered (to quote Tim Peters) "inherently
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171 hosed" because:
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172 - It does not guarantee the promise that a non-zero integer is returned.
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173 - The cast to long is inherently unsafe.
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174 - It is not clear that the 'volatile' (for AIX?) and ugly casting in the
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175 latter return statement (for Alpha OSF/1) are any longer necessary.
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176 */
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177 long
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178 PyThread_get_thread_ident(void)
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179 {
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180 volatile pthread_t threadid;
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181 if (!initialized)
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182 PyThread_init_thread();
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183 /* Jump through some hoops for Alpha OSF/1 */
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184 threadid = pthread_self();
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185 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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186 return (long) threadid;
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187 #else
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188 return (long) *(long *) &threadid;
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189 #endif
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190 }
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191
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192 static void
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193 do_PyThread_exit_thread(int no_cleanup)
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194 {
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195 dprintf(("PyThread_exit_thread called\n"));
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196 if (!initialized) {
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197 if (no_cleanup)
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198 _exit(0);
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199 else
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200 exit(0);
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201 }
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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(0);
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208 }
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209
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210 void
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211 PyThread__exit_thread(void)
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212 {
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213 do_PyThread_exit_thread(1);
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214 }
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215
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216 #ifndef NO_EXIT_PROG
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217 static void
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218 do_PyThread_exit_prog(int status, int no_cleanup)
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219 {
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220 dprintf(("PyThread_exit_prog(%d) called\n", status));
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221 if (!initialized)
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222 if (no_cleanup)
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223 _exit(status);
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224 else
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225 exit(status);
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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, 0);
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232 }
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233
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234 void
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235 PyThread__exit_prog(int status)
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236 {
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237 do_PyThread_exit_prog(status, 1);
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238 }
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239 #endif /* NO_EXIT_PROG */
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240
22339
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241 #ifdef USE_SEMAPHORES
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242
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243 /*
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244 * Lock support.
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245 */
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246
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247 PyThread_type_lock
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248 PyThread_allocate_lock(void)
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249 {
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250 sem_t *lock;
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251 int status, error = 0;
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252
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253 dprintf(("PyThread_allocate_lock called\n"));
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254 if (!initialized)
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255 PyThread_init_thread();
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256
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257 lock = (sem_t *)malloc(sizeof(sem_t));
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258
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259 if (lock) {
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260 status = sem_init(lock,0,1);
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261 CHECK_STATUS("sem_init");
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262
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263 if (error) {
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264 free((void *)lock);
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265 lock = NULL;
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266 }
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267 }
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268
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269 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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270 return (PyThread_type_lock)lock;
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271 }
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272
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273 void
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274 PyThread_free_lock(PyThread_type_lock lock)
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275 {
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276 sem_t *thelock = (sem_t *)lock;
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277 int status, error = 0;
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278
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279 dprintf(("PyThread_free_lock(%p) called\n", lock));
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280
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281 if (!thelock)
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282 return;
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283
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284 status = sem_destroy(thelock);
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285 CHECK_STATUS("sem_destroy");
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286
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287 free((void *)thelock);
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288 }
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289
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290 /*
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291 * As of February 2002, Cygwin thread implementations mistakenly report error
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292 * codes in the return value of the sem_ calls (like the pthread_ functions).
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293 * Correct implementations return -1 and put the code in errno. This supports
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294 * either.
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295 */
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296 static int
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297 fix_status(int status)
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298 {
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299 return (status == -1) ? errno : status;
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300 }
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301
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302 int
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303 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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304 {
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305 int success;
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306 sem_t *thelock = (sem_t *)lock;
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307 int status, error = 0;
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308
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309 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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310
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311 do {
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312 if (waitflag)
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313 status = fix_status(sem_wait(thelock));
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314 else
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315 status = fix_status(sem_trywait(thelock));
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316 } while (status == EINTR); /* Retry if interrupted by a signal */
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317
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318 if (waitflag) {
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319 CHECK_STATUS("sem_wait");
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320 } else if (status != EAGAIN) {
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321 CHECK_STATUS("sem_trywait");
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322 }
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323
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324 success = (status == 0) ? 1 : 0;
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325
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326 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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327 return success;
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328 }
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329
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330 void
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331 PyThread_release_lock(PyThread_type_lock lock)
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332 {
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333 sem_t *thelock = (sem_t *)lock;
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334 int status, error = 0;
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335
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336 dprintf(("PyThread_release_lock(%p) called\n", lock));
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337
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338 status = sem_post(thelock);
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339 CHECK_STATUS("sem_post");
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340 }
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341
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342 #else /* USE_SEMAPHORES */
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343
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344 /*
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345 * Lock support.
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346 */
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
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347 PyThread_type_lock
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348 PyThread_allocate_lock(void)
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349 {
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350 pthread_lock *lock;
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351 int status, error = 0;
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352
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353 dprintf(("PyThread_allocate_lock called\n"));
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354 if (!initialized)
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355 PyThread_init_thread();
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356
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357 lock = (pthread_lock *) malloc(sizeof(pthread_lock));
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358 if (lock) {
35607
5a8bf8e7d010 Don't call memset() before checking that the ptr is not NULL.
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diff changeset
359 memset((void *)lock, '\0', sizeof(pthread_lock));
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360 lock->locked = 0;
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361
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362 status = pthread_mutex_init(&lock->mut,
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363 pthread_mutexattr_default);
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364 CHECK_STATUS("pthread_mutex_init");
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365
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366 status = pthread_cond_init(&lock->lock_released,
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367 pthread_condattr_default);
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368 CHECK_STATUS("pthread_cond_init");
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369
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370 if (error) {
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371 free((void *)lock);
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372 lock = 0;
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373 }
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374 }
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375
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
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376 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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377 return (PyThread_type_lock) lock;
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378 }
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379
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380 void
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381 PyThread_free_lock(PyThread_type_lock lock)
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382 {
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383 pthread_lock *thelock = (pthread_lock *)lock;
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384 int status, error = 0;
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385
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386 dprintf(("PyThread_free_lock(%p) called\n", lock));
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387
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388 status = pthread_mutex_destroy( &thelock->mut );
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389 CHECK_STATUS("pthread_mutex_destroy");
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390
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391 status = pthread_cond_destroy( &thelock->lock_released );
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392 CHECK_STATUS("pthread_cond_destroy");
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393
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394 free((void *)thelock);
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395 }
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396
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397 int
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398 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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399 {
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400 int success;
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401 pthread_lock *thelock = (pthread_lock *)lock;
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402 int status, error = 0;
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403
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404 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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405
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406 status = pthread_mutex_lock( &thelock->mut );
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407 CHECK_STATUS("pthread_mutex_lock[1]");
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408 success = thelock->locked == 0;
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409
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410 if ( !success && waitflag ) {
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411 /* continue trying until we get the lock */
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412
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413 /* mut must be locked by me -- part of the condition
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414 * protocol */
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415 while ( thelock->locked ) {
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416 status = pthread_cond_wait(&thelock->lock_released,
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417 &thelock->mut);
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418 CHECK_STATUS("pthread_cond_wait");
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419 }
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420 success = 1;
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421 }
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422 if (success) thelock->locked = 1;
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423 status = pthread_mutex_unlock( &thelock->mut );
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424 CHECK_STATUS("pthread_mutex_unlock[1]");
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425
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426 if (error) success = 0;
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427 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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428 return success;
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429 }
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430
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431 void
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432 PyThread_release_lock(PyThread_type_lock lock)
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433 {
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434 pthread_lock *thelock = (pthread_lock *)lock;
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435 int status, error = 0;
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436
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437 dprintf(("PyThread_release_lock(%p) called\n", lock));
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438
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439 status = pthread_mutex_lock( &thelock->mut );
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440 CHECK_STATUS("pthread_mutex_lock[3]");
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441
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442 thelock->locked = 0;
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443
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444 status = pthread_mutex_unlock( &thelock->mut );
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445 CHECK_STATUS("pthread_mutex_unlock[3]");
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446
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447 /* wake up someone (anyone, if any) waiting on the lock */
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448 status = pthread_cond_signal( &thelock->lock_released );
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449 CHECK_STATUS("pthread_cond_signal");
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450 }
22339
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451
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452 #endif /* USE_SEMAPHORES */