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annotate Python/thread_pthread.h @ 38578:0b2b076e5908 legacy-trunk

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Patch #1454481: Make thread stack size runtime tunable.
author Andrew MacIntyre <andymac@bullseye.apana.org.au>
date Sun, 04 Jun 2006 12:31:09 +0000
parents 4f97b6a229ce
children c4587a5f5e94
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 requires that use of pthread_attr_setstacksize
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16 be conditional on _POSIX_THREAD_ATTR_STACKSIZE being defined. */
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17 #ifdef _POSIX_THREAD_ATTR_STACKSIZE
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18 #ifndef THREAD_STACK_SIZE
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19 #define THREAD_STACK_SIZE 0 /* use default stack size */
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20 #endif
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21 /* for safety, ensure a viable minimum stacksize */
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22 #define THREAD_STACK_MIN 0x8000 /* 32kB */
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23 #if THREAD_STACK_MIN < PTHREAD_STACK_MIN
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24 #undef THREAD_STACK_MIN
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25 #define THREAD_STACK_MIN PTHREAD_STACK_MIN
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26 #endif
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27 #else /* !_POSIX_THREAD_ATTR_STACKSIZE */
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28 #ifdef THREAD_STACK_SIZE
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29 #error "THREAD_STACK_SIZE defined but _POSIX_THREAD_ATTR_STACKSIZE undefined"
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30 #endif
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31 #endif
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32
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33 /* The POSIX spec says that implementations supporting the sem_*
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34 family of functions must indicate this by defining
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35 _POSIX_SEMAPHORES. */
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36 #ifdef _POSIX_SEMAPHORES
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37 /* On FreeBSD 4.x, _POSIX_SEMAPHORES is defined empty, so
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38 we need to add 0 to make it work there as well. */
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39 #if (_POSIX_SEMAPHORES+0) == -1
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40 #define HAVE_BROKEN_POSIX_SEMAPHORES
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41 #else
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42 #include <semaphore.h>
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43 #include <errno.h>
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44 #endif
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45 #endif
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46
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47 /* Before FreeBSD 5.4, system scope threads was very limited resource
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48 in default setting. So the process scope is preferred to get
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49 enough number of threads to work. */
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50 #ifdef __FreeBSD__
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51 #include <osreldate.h>
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52 #if __FreeBSD_version >= 500000 && __FreeBSD_version < 504101
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53 #undef PTHREAD_SYSTEM_SCHED_SUPPORTED
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54 #endif
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55 #endif
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56
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57 #if !defined(pthread_attr_default)
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58 # define pthread_attr_default ((pthread_attr_t *)NULL)
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59 #endif
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60 #if !defined(pthread_mutexattr_default)
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61 # define pthread_mutexattr_default ((pthread_mutexattr_t *)NULL)
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62 #endif
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63 #if !defined(pthread_condattr_default)
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64 # define pthread_condattr_default ((pthread_condattr_t *)NULL)
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65 #endif
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67
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68 /* Whether or not to use semaphores directly rather than emulating them with
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69 * mutexes and condition variables:
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70 */
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71 #if defined(_POSIX_SEMAPHORES) && !defined(HAVE_BROKEN_POSIX_SEMAPHORES)
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72 # define USE_SEMAPHORES
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73 #else
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74 # undef USE_SEMAPHORES
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75 #endif
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76
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77
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78 /* On platforms that don't use standard POSIX threads pthread_sigmask()
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79 * isn't present. DEC threads uses sigprocmask() instead as do most
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80 * other UNIX International compliant systems that don't have the full
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81 * pthread implementation.
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82 */
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83 #if defined(HAVE_PTHREAD_SIGMASK) && !defined(HAVE_BROKEN_PTHREAD_SIGMASK)
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84 # define SET_THREAD_SIGMASK pthread_sigmask
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85 #else
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86 # define SET_THREAD_SIGMASK sigprocmask
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87 #endif
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88
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89
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90 /* A pthread mutex isn't sufficient to model the Python lock type
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91 * because, according to Draft 5 of the docs (P1003.4a/D5), both of the
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92 * following are undefined:
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93 * -> a thread tries to lock a mutex it already has locked
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94 * -> a thread tries to unlock a mutex locked by a different thread
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95 * pthread mutexes are designed for serializing threads over short pieces
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96 * of code anyway, so wouldn't be an appropriate implementation of
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97 * Python's locks regardless.
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98 *
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99 * The pthread_lock struct implements a Python lock as a "locked?" bit
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100 * and a <condition, mutex> pair. In general, if the bit can be acquired
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101 * instantly, it is, else the pair is used to block the thread until the
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102 * bit is cleared. 9 May 1994 tim@ksr.com
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103 */
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104
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105 typedef struct {
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106 char locked; /* 0=unlocked, 1=locked */
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107 /* a <cond, mutex> pair to handle an acquire of a locked lock */
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108 pthread_cond_t lock_released;
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109 pthread_mutex_t mut;
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110 } pthread_lock;
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111
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112 #define CHECK_STATUS(name) if (status != 0) { perror(name); error = 1; }
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113
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114 /*
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115 * Initialization.
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116 */
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117
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118 #ifdef _HAVE_BSDI
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119 static
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120 void _noop(void)
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121 {
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122 }
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123
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124 static void
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125 PyThread__init_thread(void)
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126 {
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127 /* DO AN INIT BY STARTING THE THREAD */
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128 static int dummy = 0;
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129 pthread_t thread1;
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130 pthread_create(&thread1, NULL, (void *) _noop, &dummy);
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131 pthread_join(thread1, NULL);
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132 }
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133
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134 #else /* !_HAVE_BSDI */
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135
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136 static void
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137 PyThread__init_thread(void)
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138 {
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139 #if defined(_AIX) && defined(__GNUC__)
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140 pthread_init();
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141 #endif
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142 }
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143
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144 #endif /* !_HAVE_BSDI */
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145
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146 /*
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147 * Thread support.
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148 */
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149
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150
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151 long
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152 PyThread_start_new_thread(void (*func)(void *), void *arg)
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153 {
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154 pthread_t th;
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155 int status;
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156 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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157 pthread_attr_t attrs;
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158 #endif
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159 #if defined(THREAD_STACK_SIZE)
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160 size_t tss;
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161 #endif
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162
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163 dprintf(("PyThread_start_new_thread called\n"));
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164 if (!initialized)
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165 PyThread_init_thread();
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166
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167 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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168 pthread_attr_init(&attrs);
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169 #endif
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170 #if defined(THREAD_STACK_SIZE)
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171 tss = (_pythread_stacksize != 0) ? _pythread_stacksize
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172 : THREAD_STACK_SIZE;
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173 if (tss != 0) {
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174 if (pthread_attr_setstacksize(&attrs, tss) != 0) {
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175 pthread_attr_destroy(&attrs);
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176 return -1;
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177 }
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178 }
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179 #endif
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180 #if defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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181 pthread_attr_setscope(&attrs, PTHREAD_SCOPE_SYSTEM);
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182 #endif
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183
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184 status = pthread_create(&th,
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185 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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186 &attrs,
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187 #else
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188 (pthread_attr_t*)NULL,
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189 #endif
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190 (void* (*)(void *))func,
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191 (void *)arg
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192 );
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193
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194 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
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195 pthread_attr_destroy(&attrs);
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196 #endif
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197 if (status != 0)
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198 return -1;
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199
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200 pthread_detach(th);
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201
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202 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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203 return (long) th;
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204 #else
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205 return (long) *(long *) &th;
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206 #endif
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207 }
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208
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209 /* XXX This implementation is considered (to quote Tim Peters) "inherently
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210 hosed" because:
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211 - It does not guarantee the promise that a non-zero integer is returned.
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212 - The cast to long is inherently unsafe.
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213 - It is not clear that the 'volatile' (for AIX?) and ugly casting in the
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214 latter return statement (for Alpha OSF/1) are any longer necessary.
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215 */
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216 long
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217 PyThread_get_thread_ident(void)
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218 {
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219 volatile pthread_t threadid;
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220 if (!initialized)
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221 PyThread_init_thread();
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222 /* Jump through some hoops for Alpha OSF/1 */
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223 threadid = pthread_self();
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224 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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225 return (long) threadid;
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226 #else
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227 return (long) *(long *) &threadid;
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228 #endif
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229 }
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230
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231 static void
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232 do_PyThread_exit_thread(int no_cleanup)
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233 {
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234 dprintf(("PyThread_exit_thread called\n"));
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235 if (!initialized) {
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236 if (no_cleanup)
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237 _exit(0);
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238 else
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239 exit(0);
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240 }
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241 }
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242
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243 void
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244 PyThread_exit_thread(void)
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245 {
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246 do_PyThread_exit_thread(0);
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247 }
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248
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249 void
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250 PyThread__exit_thread(void)
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251 {
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252 do_PyThread_exit_thread(1);
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253 }
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254
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255 #ifndef NO_EXIT_PROG
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256 static void
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257 do_PyThread_exit_prog(int status, int no_cleanup)
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258 {
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259 dprintf(("PyThread_exit_prog(%d) called\n", status));
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260 if (!initialized)
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261 if (no_cleanup)
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262 _exit(status);
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263 else
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264 exit(status);
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265 }
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266
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267 void
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268 PyThread_exit_prog(int status)
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269 {
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270 do_PyThread_exit_prog(status, 0);
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271 }
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272
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273 void
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274 PyThread__exit_prog(int status)
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275 {
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276 do_PyThread_exit_prog(status, 1);
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277 }
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278 #endif /* NO_EXIT_PROG */
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279
22339
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280 #ifdef USE_SEMAPHORES
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281
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282 /*
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283 * Lock support.
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284 */
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285
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286 PyThread_type_lock
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287 PyThread_allocate_lock(void)
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288 {
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289 sem_t *lock;
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290 int status, error = 0;
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291
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292 dprintf(("PyThread_allocate_lock called\n"));
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293 if (!initialized)
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294 PyThread_init_thread();
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295
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296 lock = (sem_t *)malloc(sizeof(sem_t));
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297
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298 if (lock) {
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299 status = sem_init(lock,0,1);
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300 CHECK_STATUS("sem_init");
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301
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302 if (error) {
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303 free((void *)lock);
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304 lock = NULL;
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305 }
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306 }
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307
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308 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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309 return (PyThread_type_lock)lock;
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310 }
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311
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312 void
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313 PyThread_free_lock(PyThread_type_lock lock)
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314 {
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315 sem_t *thelock = (sem_t *)lock;
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316 int status, error = 0;
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317
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318 dprintf(("PyThread_free_lock(%p) called\n", lock));
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319
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320 if (!thelock)
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321 return;
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322
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323 status = sem_destroy(thelock);
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324 CHECK_STATUS("sem_destroy");
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325
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326 free((void *)thelock);
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327 }
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328
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329 /*
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330 * As of February 2002, Cygwin thread implementations mistakenly report error
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331 * codes in the return value of the sem_ calls (like the pthread_ functions).
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332 * Correct implementations return -1 and put the code in errno. This supports
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333 * either.
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334 */
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335 static int
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336 fix_status(int status)
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337 {
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338 return (status == -1) ? errno : status;
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339 }
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340
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341 int
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342 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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343 {
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344 int success;
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345 sem_t *thelock = (sem_t *)lock;
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346 int status, error = 0;
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347
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348 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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349
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350 do {
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351 if (waitflag)
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352 status = fix_status(sem_wait(thelock));
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353 else
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354 status = fix_status(sem_trywait(thelock));
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355 } while (status == EINTR); /* Retry if interrupted by a signal */
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356
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357 if (waitflag) {
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358 CHECK_STATUS("sem_wait");
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359 } else if (status != EAGAIN) {
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360 CHECK_STATUS("sem_trywait");
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361 }
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362
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363 success = (status == 0) ? 1 : 0;
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364
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365 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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366 return success;
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367 }
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368
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369 void
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370 PyThread_release_lock(PyThread_type_lock lock)
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371 {
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372 sem_t *thelock = (sem_t *)lock;
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373 int status, error = 0;
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374
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
375 dprintf(("PyThread_release_lock(%p) called\n", lock));
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
376
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
377 status = sem_post(thelock);
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
378 CHECK_STATUS("sem_post");
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
379 }
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
380
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
381 #else /* USE_SEMAPHORES */
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
382
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parents:
diff changeset
383 /*
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
384 * Lock support.
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Guido van Rossum <guido@python.org>
parents:
diff changeset
385 */
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
386 PyThread_type_lock
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Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
387 PyThread_allocate_lock(void)
1628
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diff changeset
388 {
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diff changeset
389 pthread_lock *lock;
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diff changeset
390 int status, error = 0;
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parents:
diff changeset
391
9679
877d23bd5bdc Thanks to Chris Herborth, the thread primitives now have proper Py*
Guido van Rossum <guido@python.org>
parents: 9290
diff changeset
392 dprintf(("PyThread_allocate_lock called\n"));
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a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
393 if (!initialized)
9679
877d23bd5bdc Thanks to Chris Herborth, the thread primitives now have proper Py*
Guido van Rossum <guido@python.org>
parents: 9290
diff changeset
394 PyThread_init_thread();
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
395
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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diff changeset
396 lock = (pthread_lock *) malloc(sizeof(pthread_lock));
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4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
397 if (lock) {
35607
5a8bf8e7d010 Don't call memset() before checking that the ptr is not NULL.
Armin Rigo <arigo@tunes.org>
parents: 34824
diff changeset
398 memset((void *)lock, '\0', sizeof(pthread_lock));
1629
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Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
399 lock->locked = 0;
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Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
400
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
401 status = pthread_mutex_init(&lock->mut,
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
402 pthread_mutexattr_default);
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
403 CHECK_STATUS("pthread_mutex_init");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
404
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
405 status = pthread_cond_init(&lock->lock_released,
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
406 pthread_condattr_default);
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Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
407 CHECK_STATUS("pthread_cond_init");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
408
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
409 if (error) {
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
410 free((void *)lock);
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Guido van Rossum <guido@python.org>
parents:
diff changeset
411 lock = 0;
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
412 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
413 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
414
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
415 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
9679
877d23bd5bdc Thanks to Chris Herborth, the thread primitives now have proper Py*
Guido van Rossum <guido@python.org>
parents: 9290
diff changeset
416 return (PyThread_type_lock) lock;
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
417 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
418
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
419 void
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
420 PyThread_free_lock(PyThread_type_lock lock)
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
421 {
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
422 pthread_lock *thelock = (pthread_lock *)lock;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
423 int status, error = 0;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
424
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
425 dprintf(("PyThread_free_lock(%p) called\n", lock));
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
426
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
427 status = pthread_mutex_destroy( &thelock->mut );
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
428 CHECK_STATUS("pthread_mutex_destroy");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
429
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
430 status = pthread_cond_destroy( &thelock->lock_released );
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
431 CHECK_STATUS("pthread_cond_destroy");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
432
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
433 free((void *)thelock);
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a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
434 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
435
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
436 int
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
437 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
438 {
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
439 int success;
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
440 pthread_lock *thelock = (pthread_lock *)lock;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
441 int status, error = 0;
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
442
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
443 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
444
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
445 status = pthread_mutex_lock( &thelock->mut );
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
446 CHECK_STATUS("pthread_mutex_lock[1]");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
447 success = thelock->locked == 0;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
448
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
449 if ( !success && waitflag ) {
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
450 /* continue trying until we get the lock */
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
451
1629
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Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
452 /* mut must be locked by me -- part of the condition
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
453 * protocol */
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
454 while ( thelock->locked ) {
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
455 status = pthread_cond_wait(&thelock->lock_released,
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
456 &thelock->mut);
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
457 CHECK_STATUS("pthread_cond_wait");
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
458 }
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
459 success = 1;
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
460 }
28673
c1ba50790c83 Patch #711835: Remove unnecessary lock operations. Will backport to 2.2.
Martin v. Löwis <martin@v.loewis.de>
parents: 27320
diff changeset
461 if (success) thelock->locked = 1;
c1ba50790c83 Patch #711835: Remove unnecessary lock operations. Will backport to 2.2.
Martin v. Löwis <martin@v.loewis.de>
parents: 27320
diff changeset
462 status = pthread_mutex_unlock( &thelock->mut );
c1ba50790c83 Patch #711835: Remove unnecessary lock operations. Will backport to 2.2.
Martin v. Löwis <martin@v.loewis.de>
parents: 27320
diff changeset
463 CHECK_STATUS("pthread_mutex_unlock[1]");
c1ba50790c83 Patch #711835: Remove unnecessary lock operations. Will backport to 2.2.
Martin v. Löwis <martin@v.loewis.de>
parents: 27320
diff changeset
464
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
465 if (error) success = 0;
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
466 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
467 return success;
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
468 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
469
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
470 void
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
471 PyThread_release_lock(PyThread_type_lock lock)
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
472 {
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
473 pthread_lock *thelock = (pthread_lock *)lock;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
474 int status, error = 0;
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
475
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
476 dprintf(("PyThread_release_lock(%p) called\n", lock));
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
477
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
478 status = pthread_mutex_lock( &thelock->mut );
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
479 CHECK_STATUS("pthread_mutex_lock[3]");
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
480
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
481 thelock->locked = 0;
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
482
1629
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
483 status = pthread_mutex_unlock( &thelock->mut );
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
484 CHECK_STATUS("pthread_mutex_unlock[3]");
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
485
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
486 /* wake up someone (anyone, if any) waiting on the lock */
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
487 status = pthread_cond_signal( &thelock->lock_released );
4121afd76d73 Tim's changes; removed some remaining non-functional ifdefs
Guido van Rossum <guido@python.org>
parents: 1628
diff changeset
488 CHECK_STATUS("pthread_cond_signal");
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
489 }
22339
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
490
6c3e32357d91 Patch #525532: Add support for POSIX semaphores.
Martin v. Löwis <martin@v.loewis.de>
parents: 21766
diff changeset
491 #endif /* USE_SEMAPHORES */
38578
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
492
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
493 /* set the thread stack size.
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
494 * Return 1 if an exception is pending, 0 otherwise.
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
495 */
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
496 static int
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
497 _pythread_pthread_set_stacksize(size_t size)
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
498 {
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
499 /* set to default */
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
500 if (size == 0) {
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
501 _pythread_stacksize = 0;
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
502 return 0;
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
503 }
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
504
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
505 /* valid range? */
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
506 if (size >= THREAD_STACK_MIN) {
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
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507 _pythread_stacksize = size;
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parents: 37168
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508 return 0;
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
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parents: 37168
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509 }
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
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510 else {
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
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511 char warning[128];
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
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512 snprintf(warning,
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
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parents: 37168
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513 128,
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
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514 "thread stack size of %#x bytes not supported",
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
515 size);
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
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516 return PyErr_Warn(PyExc_RuntimeWarning, warning);
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
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517 }
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
518 }
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
519
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
520 #undef THREAD_SET_STACKSIZE
0b2b076e5908 Patch #1454481: Make thread stack size runtime tunable.
Andrew MacIntyre <andymac@bullseye.apana.org.au>
parents: 37168
diff changeset
521 #define THREAD_SET_STACKSIZE(x) _pythread_pthread_set_stacksize(x)