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annotate Python/thread_pthread.h @ 68233:e849d484029f 2.1

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author Georg Brandl <georg@python.org>
date Sat, 05 Mar 2011 14:54:46 +0100
parents a1d6cd97e319
children
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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 #include <pthread.h>
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7
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8
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9 /* try to determine what version of the Pthread Standard is installed.
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10 * this is important, since all sorts of parameter types changed from
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11 * draft to draft and there are several (incompatible) drafts in
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12 * common use. these macros are a start, at least.
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13 * 12 May 1997 -- david arnold <davida@pobox.com>
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14 */
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16 #if defined(__ultrix) && defined(__mips) && defined(_DECTHREADS_)
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17 /* _DECTHREADS_ is defined in cma.h which is included by pthread.h */
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18 # define PY_PTHREAD_D4
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19
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20 #elif defined(__osf__) && defined (__alpha)
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21 /* _DECTHREADS_ is defined in cma.h which is included by pthread.h */
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22 # if !defined(_PTHREAD_ENV_ALPHA) || defined(_PTHREAD_USE_D4) || defined(PTHREAD_USE_D4)
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23 # define PY_PTHREAD_D4
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24 # else
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25 # define PY_PTHREAD_STD
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26 # endif
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27
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28 #elif defined(_AIX)
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29 /* SCHED_BG_NP is defined if using AIX DCE pthreads
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30 * but it is unsupported by AIX 4 pthreads. Default
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31 * attributes for AIX 4 pthreads equal to NULL. For
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32 * AIX DCE pthreads they should be left unchanged.
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33 */
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34 # if !defined(SCHED_BG_NP)
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35 # define PY_PTHREAD_STD
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36 # else
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37 # define PY_PTHREAD_D7
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38 # endif
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39
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40 #elif defined(__DGUX)
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41 # define PY_PTHREAD_D6
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42
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43 #elif defined(__hpux) && defined(_DECTHREADS_)
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44 # define PY_PTHREAD_D4
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45
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46 #else /* Default case */
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47 # define PY_PTHREAD_STD
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48
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49 #endif
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51
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52 /* set default attribute object for different versions */
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53
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54 #if defined(PY_PTHREAD_D4) || defined(PY_PTHREAD_D7)
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55 # define pthread_attr_default pthread_attr_default
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56 # define pthread_mutexattr_default pthread_mutexattr_default
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57 # define pthread_condattr_default pthread_condattr_default
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58 #elif defined(PY_PTHREAD_STD) || defined(PY_PTHREAD_D6)
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59 # define pthread_attr_default ((pthread_attr_t *)NULL)
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60 # define pthread_mutexattr_default ((pthread_mutexattr_t *)NULL)
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61 # define pthread_condattr_default ((pthread_condattr_t *)NULL)
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62 #endif
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64
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65 /* A pthread mutex isn't sufficient to model the Python lock type
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66 * because, according to Draft 5 of the docs (P1003.4a/D5), both of the
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67 * following are undefined:
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68 * -> a thread tries to lock a mutex it already has locked
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69 * -> a thread tries to unlock a mutex locked by a different thread
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70 * pthread mutexes are designed for serializing threads over short pieces
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71 * of code anyway, so wouldn't be an appropriate implementation of
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72 * Python's locks regardless.
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73 *
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74 * The pthread_lock struct implements a Python lock as a "locked?" bit
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75 * and a <condition, mutex> pair. In general, if the bit can be acquired
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76 * instantly, it is, else the pair is used to block the thread until the
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77 * bit is cleared. 9 May 1994 tim@ksr.com
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78 */
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79
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80 typedef struct {
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81 char locked; /* 0=unlocked, 1=locked */
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82 /* a <cond, mutex> pair to handle an acquire of a locked lock */
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83 pthread_cond_t lock_released;
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84 pthread_mutex_t mut;
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85 } pthread_lock;
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86
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87 #define CHECK_STATUS(name) if (status != 0) { perror(name); error = 1; }
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88
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89 /*
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90 * Initialization.
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91 */
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92
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93 #ifdef _HAVE_BSDI
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94 static
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95 void _noop(void)
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96 {
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97 }
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98
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99 static void
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100 PyThread__init_thread(void)
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101 {
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102 /* DO AN INIT BY STARTING THE THREAD */
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103 static int dummy = 0;
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104 pthread_t thread1;
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105 pthread_create(&thread1, NULL, (void *) _noop, &dummy);
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106 pthread_join(thread1, NULL);
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107 }
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108
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109 #else /* !_HAVE_BSDI */
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110
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111 static void
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112 PyThread__init_thread(void)
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113 {
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114 #if defined(_AIX) && defined(__GNUC__)
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115 pthread_init();
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116 #endif
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117 }
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118
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119 #endif /* !_HAVE_BSDI */
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120
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121 /*
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122 * Thread support.
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123 */
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124
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125
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126 int
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127 PyThread_start_new_thread(void (*func)(void *), void *arg)
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128 {
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129 pthread_t th;
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130 int success;
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131 #ifdef PTHREAD_SYSTEM_SCHED_SUPPORTED
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132 pthread_attr_t attrs;
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133 #endif
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134 dprintf(("PyThread_start_new_thread called\n"));
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135 if (!initialized)
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136 PyThread_init_thread();
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137 #ifdef PTHREAD_SYSTEM_SCHED_SUPPORTED
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138 pthread_attr_init(&attrs);
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139 pthread_attr_setscope(&attrs, PTHREAD_SCOPE_SYSTEM);
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140 #endif
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141
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142 success = pthread_create(&th,
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143 #if defined(PY_PTHREAD_D4)
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144 pthread_attr_default,
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145 (pthread_startroutine_t)func,
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146 (pthread_addr_t)arg
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147 #elif defined(PY_PTHREAD_D6)
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148 pthread_attr_default,
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149 (void* (*)(void *))func,
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150 arg
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151 #elif defined(PY_PTHREAD_D7)
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152 pthread_attr_default,
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153 func,
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154 arg
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155 #elif defined(PY_PTHREAD_STD)
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156 #ifdef PTHREAD_SYSTEM_SCHED_SUPPORTED
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157 &attrs,
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158 #else
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159 (pthread_attr_t*)NULL,
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160 #endif
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161 (void* (*)(void *))func,
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162 (void *)arg
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163 #endif
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164 );
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165
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166 if (success == 0) {
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167 #if defined(PY_PTHREAD_D4) || defined(PY_PTHREAD_D6) || defined(PY_PTHREAD_D7)
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168 pthread_detach(&th);
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169 #elif defined(PY_PTHREAD_STD)
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170 pthread_detach(th);
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171 #endif
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172 }
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173 return success != 0 ? 0 : 1;
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174 }
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175
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176 /* XXX This implementation is considered (to quote Tim Peters) "inherently
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177 hosed" because:
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178 - It does not guanrantee the promise that a non-zero integer is returned.
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179 - The cast to long is inherently unsafe.
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180 - It is not clear that the 'volatile' (for AIX?) and ugly casting in the
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181 latter return statement (for Alpha OSF/1) are any longer necessary.
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182 */
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183 long
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184 PyThread_get_thread_ident(void)
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185 {
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186 volatile pthread_t threadid;
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187 if (!initialized)
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188 PyThread_init_thread();
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189 /* Jump through some hoops for Alpha OSF/1 */
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190 threadid = pthread_self();
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191 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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192 return (long) threadid;
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193 #else
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194 return (long) *(long *) &threadid;
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195 #endif
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196 }
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197
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198 static void
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199 do_PyThread_exit_thread(int no_cleanup)
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200 {
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201 dprintf(("PyThread_exit_thread called\n"));
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202 if (!initialized) {
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203 if (no_cleanup)
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204 _exit(0);
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205 else
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206 exit(0);
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207 }
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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(0);
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214 }
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215
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216 void
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217 PyThread__exit_thread(void)
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218 {
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219 do_PyThread_exit_thread(1);
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220 }
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221
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222 #ifndef NO_EXIT_PROG
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223 static void
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224 do_PyThread_exit_prog(int status, int no_cleanup)
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225 {
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226 dprintf(("PyThread_exit_prog(%d) called\n", status));
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227 if (!initialized)
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228 if (no_cleanup)
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229 _exit(status);
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230 else
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231 exit(status);
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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, 0);
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238 }
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239
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240 void
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241 PyThread__exit_prog(int status)
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242 {
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243 do_PyThread_exit_prog(status, 1);
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244 }
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245 #endif /* NO_EXIT_PROG */
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246
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247 /*
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248 * Lock support.
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249 */
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250 PyThread_type_lock
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251 PyThread_allocate_lock(void)
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252 {
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253 pthread_lock *lock;
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254 int status, error = 0;
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255
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256 dprintf(("PyThread_allocate_lock called\n"));
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257 if (!initialized)
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258 PyThread_init_thread();
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259
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260 lock = (pthread_lock *) malloc(sizeof(pthread_lock));
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261 memset((void *)lock, '\0', sizeof(pthread_lock));
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262 if (lock) {
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263 lock->locked = 0;
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264
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265 status = pthread_mutex_init(&lock->mut,
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266 pthread_mutexattr_default);
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267 CHECK_STATUS("pthread_mutex_init");
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268
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269 status = pthread_cond_init(&lock->lock_released,
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270 pthread_condattr_default);
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271 CHECK_STATUS("pthread_cond_init");
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272
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273 if (error) {
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274 free((void *)lock);
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275 lock = 0;
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276 }
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277 }
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278
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279 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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280 return (PyThread_type_lock) lock;
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281 }
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282
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283 void
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284 PyThread_free_lock(PyThread_type_lock lock)
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285 {
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286 pthread_lock *thelock = (pthread_lock *)lock;
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287 int status, error = 0;
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288
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289 dprintf(("PyThread_free_lock(%p) called\n", lock));
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290
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291 status = pthread_mutex_destroy( &thelock->mut );
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292 CHECK_STATUS("pthread_mutex_destroy");
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293
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294 status = pthread_cond_destroy( &thelock->lock_released );
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295 CHECK_STATUS("pthread_cond_destroy");
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296
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297 free((void *)thelock);
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298 }
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299
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300 int
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301 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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302 {
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303 int success;
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304 pthread_lock *thelock = (pthread_lock *)lock;
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305 int status, error = 0;
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306
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307 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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308
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309 status = pthread_mutex_lock( &thelock->mut );
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310 CHECK_STATUS("pthread_mutex_lock[1]");
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311 success = thelock->locked == 0;
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312 if (success) thelock->locked = 1;
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313 status = pthread_mutex_unlock( &thelock->mut );
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314 CHECK_STATUS("pthread_mutex_unlock[1]");
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315
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316 if ( !success && waitflag ) {
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317 /* continue trying until we get the lock */
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318
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319 /* mut must be locked by me -- part of the condition
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320 * protocol */
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321 status = pthread_mutex_lock( &thelock->mut );
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322 CHECK_STATUS("pthread_mutex_lock[2]");
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323 while ( thelock->locked ) {
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324 status = pthread_cond_wait(&thelock->lock_released,
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325 &thelock->mut);
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326 CHECK_STATUS("pthread_cond_wait");
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327 }
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328 thelock->locked = 1;
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329 status = pthread_mutex_unlock( &thelock->mut );
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330 CHECK_STATUS("pthread_mutex_unlock[2]");
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331 success = 1;
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332 }
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333 if (error) success = 0;
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334 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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335 return success;
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336 }
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337
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338 void
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339 PyThread_release_lock(PyThread_type_lock lock)
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340 {
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341 pthread_lock *thelock = (pthread_lock *)lock;
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342 int status, error = 0;
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343
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344 dprintf(("PyThread_release_lock(%p) called\n", lock));
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345
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346 status = pthread_mutex_lock( &thelock->mut );
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347 CHECK_STATUS("pthread_mutex_lock[3]");
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348
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349 thelock->locked = 0;
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350
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351 status = pthread_mutex_unlock( &thelock->mut );
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352 CHECK_STATUS("pthread_mutex_unlock[3]");
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353
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354 /* wake up someone (anyone, if any) waiting on the lock */
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355 status = pthread_cond_signal( &thelock->lock_released );
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356 CHECK_STATUS("pthread_cond_signal");
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357 }
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358
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359 /*
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360 * Semaphore support.
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361 */
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362
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diff changeset
363 struct semaphore {
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diff changeset
364 pthread_mutex_t mutex;
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diff changeset
365 pthread_cond_t cond;
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366 int value;
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367 };
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368
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369 PyThread_type_sema
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370 PyThread_allocate_sema(int value)
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371 {
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372 struct semaphore *sema;
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373 int status, error = 0;
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374
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375 dprintf(("PyThread_allocate_sema called\n"));
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376 if (!initialized)
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377 PyThread_init_thread();
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378
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379 sema = (struct semaphore *) malloc(sizeof(struct semaphore));
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380 if (sema != NULL) {
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381 sema->value = value;
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382 status = pthread_mutex_init(&sema->mutex,
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383 pthread_mutexattr_default);
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384 CHECK_STATUS("pthread_mutex_init");
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385 status = pthread_cond_init(&sema->cond,
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diff changeset
386 pthread_condattr_default);
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387 CHECK_STATUS("pthread_cond_init");
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diff changeset
388 if (error) {
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diff changeset
389 free((void *) sema);
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390 sema = NULL;
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391 }
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diff changeset
392 }
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393 dprintf(("PyThread_allocate_sema() -> %p\n", sema));
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394 return (PyThread_type_sema) sema;
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395 }
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396
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397 void
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398 PyThread_free_sema(PyThread_type_sema sema)
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399 {
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400 int status, error = 0;
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401 struct semaphore *thesema = (struct semaphore *) sema;
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diff changeset
402
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403 dprintf(("PyThread_free_sema(%p) called\n", sema));
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parents: 4503
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404 status = pthread_cond_destroy(&thesema->cond);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
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405 CHECK_STATUS("pthread_cond_destroy");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
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406 status = pthread_mutex_destroy(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
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407 CHECK_STATUS("pthread_mutex_destroy");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
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408 free((void *) thesema);
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409 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
410
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
411 int
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
412 PyThread_down_sema(PyThread_type_sema sema, int waitflag)
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Guido van Rossum <guido@python.org>
parents:
diff changeset
413 {
4994
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414 int status, error = 0, success;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
415 struct semaphore *thesema = (struct semaphore *) sema;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
416
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ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
417 dprintf(("PyThread_down_sema(%p, %d) called\n", sema, waitflag));
4994
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
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418 status = pthread_mutex_lock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
419 CHECK_STATUS("pthread_mutex_lock");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
420 if (waitflag) {
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
421 while (!error && thesema->value <= 0) {
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
422 status = pthread_cond_wait(&thesema->cond,
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
423 &thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
424 CHECK_STATUS("pthread_cond_wait");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
425 }
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
426 }
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
427 if (error)
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
428 success = 0;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
429 else if (thesema->value > 0) {
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
430 thesema->value--;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
431 success = 1;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
432 }
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
433 else
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
434 success = 0;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
435 status = pthread_mutex_unlock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
436 CHECK_STATUS("pthread_mutex_unlock");
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
437 dprintf(("PyThread_down_sema(%p) return\n", sema));
4994
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
438 return success;
1628
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parents:
diff changeset
439 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
440
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
441 void
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
442 PyThread_up_sema(PyThread_type_sema sema)
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Guido van Rossum <guido@python.org>
parents:
diff changeset
443 {
4994
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
444 int status, error = 0;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
445 struct semaphore *thesema = (struct semaphore *) sema;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
446
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
447 dprintf(("PyThread_up_sema(%p)\n", sema));
4994
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
448 status = pthread_mutex_lock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
449 CHECK_STATUS("pthread_mutex_lock");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
450 thesema->value++;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
451 status = pthread_cond_signal(&thesema->cond);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
452 CHECK_STATUS("pthread_cond_signal");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
453 status = pthread_mutex_unlock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
454 CHECK_STATUS("pthread_mutex_unlock");
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
455 }