Mercurial > cpython-lru_cache-weakref

annotate Python/thread_pthread.h @ 13872:35fc9511a36f legacy-trunk

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Changed H specifier to mean "bitfield", i.e. any value from -32768..65535 is acceptable. Added B specifier (with values from -128..255). No L added (which would have completed the set) because l already accepts any value (and the letter L is taken for quadwords).
author Jack Jansen <jack.jansen@cwi.nl>
date Sat, 05 Aug 2000 21:29:58 +0000
parents f79434ee41fa
children 31cda87e9ff4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /***********************************************************
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2 Copyright (c) 2000, BeOpen.com.
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3 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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4 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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5 All rights reserved.
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6
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7 See the file "Misc/COPYRIGHT" for information on usage and
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8 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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9 ******************************************************************/
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10
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11 /* Posix threads interface */
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12
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13 #include <stdlib.h>
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14 #include <string.h>
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15 #include <pthread.h>
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16
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17
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18 /* try to determine what version of the Pthread Standard is installed.
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19 * this is important, since all sorts of parameter types changed from
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20 * draft to draft and there are several (incompatible) drafts in
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21 * common use. these macros are a start, at least.
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22 * 12 May 1997 -- david arnold <davida@pobox.com>
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23 */
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24
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25 #if defined(__ultrix) && defined(__mips) && defined(_DECTHREADS_)
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26 /* _DECTHREADS_ is defined in cma.h which is included by pthread.h */
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27 # define PY_PTHREAD_D4
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28
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29 #elif defined(__osf__) && defined (__alpha)
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30 /* _DECTHREADS_ is defined in cma.h which is included by pthread.h */
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31 # if !defined(_PTHREAD_ENV_ALPHA) || defined(_PTHREAD_USE_D4) || defined(PTHREAD_USE_D4)
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32 # define PY_PTHREAD_D4
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33 # else
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34 # define PY_PTHREAD_STD
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35 # endif
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36
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37 #elif defined(_AIX)
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38 /* SCHED_BG_NP is defined if using AIX DCE pthreads
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39 * but it is unsupported by AIX 4 pthreads. Default
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40 * attributes for AIX 4 pthreads equal to NULL. For
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41 * AIX DCE pthreads they should be left unchanged.
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42 */
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43 # if !defined(SCHED_BG_NP)
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44 # define PY_PTHREAD_STD
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45 # else
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46 # define PY_PTHREAD_D7
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47 # endif
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48
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49 #elif defined(__DGUX)
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50 # define PY_PTHREAD_D6
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51
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52 #elif defined(__hpux) && defined(_DECTHREADS_)
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53 # define PY_PTHREAD_D4
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54
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55 #else /* Default case */
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56 # define PY_PTHREAD_STD
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57
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58 #endif
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59
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60
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61 /* set default attribute object for different versions */
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62
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63 #if defined(PY_PTHREAD_D4) || defined(PY_PTHREAD_D7)
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64 # define pthread_attr_default pthread_attr_default
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65 # define pthread_mutexattr_default pthread_mutexattr_default
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66 # define pthread_condattr_default pthread_condattr_default
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67 #elif defined(PY_PTHREAD_STD) || defined(PY_PTHREAD_D6)
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68 # define pthread_attr_default ((pthread_attr_t *)NULL)
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69 # define pthread_mutexattr_default ((pthread_mutexattr_t *)NULL)
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70 # define pthread_condattr_default ((pthread_condattr_t *)NULL)
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71 #endif
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72
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73
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74 /* A pthread mutex isn't sufficient to model the Python lock type
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75 * because, according to Draft 5 of the docs (P1003.4a/D5), both of the
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76 * following are undefined:
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77 * -> a thread tries to lock a mutex it already has locked
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78 * -> a thread tries to unlock a mutex locked by a different thread
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79 * pthread mutexes are designed for serializing threads over short pieces
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80 * of code anyway, so wouldn't be an appropriate implementation of
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81 * Python's locks regardless.
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82 *
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83 * The pthread_lock struct implements a Python lock as a "locked?" bit
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84 * and a <condition, mutex> pair. In general, if the bit can be acquired
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85 * instantly, it is, else the pair is used to block the thread until the
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86 * bit is cleared. 9 May 1994 tim@ksr.com
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87 */
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88
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89 typedef struct {
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90 char locked; /* 0=unlocked, 1=locked */
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91 /* a <cond, mutex> pair to handle an acquire of a locked lock */
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92 pthread_cond_t lock_released;
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93 pthread_mutex_t mut;
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94 } pthread_lock;
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95
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96 #define CHECK_STATUS(name) if (status != 0) { perror(name); error = 1; }
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97
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98 /*
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99 * Initialization.
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100 */
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101
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102 #ifdef _HAVE_BSDI
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103 static
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104 void _noop(void)
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105 {
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106 }
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107
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108 static void
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109 PyThread__init_thread(void)
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110 {
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111 /* DO AN INIT BY STARTING THE THREAD */
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112 static int dummy = 0;
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113 pthread_t thread1;
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114 pthread_create(&thread1, NULL, (void *) _noop, &dummy);
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115 pthread_join(thread1, NULL);
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116 }
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117
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118 #else /* !_HAVE_BSDI */
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119
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120 static void
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121 PyThread__init_thread(void)
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122 {
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123 #if defined(_AIX) && defined(__GNUC__)
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124 pthread_init();
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125 #endif
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126 }
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127
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128 #endif /* !_HAVE_BSDI */
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129
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130 /*
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131 * Thread support.
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132 */
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133
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134
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135 int
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136 PyThread_start_new_thread(void (*func)(void *), void *arg)
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137 {
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138 pthread_t th;
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139 int success;
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140 dprintf(("PyThread_start_new_thread called\n"));
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141 if (!initialized)
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142 PyThread_init_thread();
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143
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144 success = pthread_create(&th,
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145 #if defined(PY_PTHREAD_D4)
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146 pthread_attr_default,
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147 (pthread_startroutine_t)func,
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148 (pthread_addr_t)arg
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149 #elif defined(PY_PTHREAD_D6)
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150 pthread_attr_default,
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151 (void* (*)(void *))func,
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152 arg
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153 #elif defined(PY_PTHREAD_D7)
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154 pthread_attr_default,
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155 func,
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156 arg
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157 #elif defined(PY_PTHREAD_STD)
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158 (pthread_attr_t*)NULL,
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159 (void* (*)(void *))func,
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160 (void *)arg
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161 #endif
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162 );
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163
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164 if (success == 0) {
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165 #if defined(PY_PTHREAD_D4) || defined(PY_PTHREAD_D6) || defined(PY_PTHREAD_D7)
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166 pthread_detach(&th);
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167 #elif defined(PY_PTHREAD_STD)
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168 pthread_detach(th);
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169 #endif
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170 }
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171 return success != 0 ? 0 : 1;
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172 }
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173
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174 long
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175 PyThread_get_thread_ident(void)
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176 {
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177 volatile pthread_t threadid;
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178 if (!initialized)
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179 PyThread_init_thread();
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180 /* Jump through some hoops for Alpha OSF/1 */
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181 threadid = pthread_self();
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182 return (long) *(long *) &threadid;
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183 }
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184
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185 static void
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186 do_PyThread_exit_thread(int no_cleanup)
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187 {
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188 dprintf(("PyThread_exit_thread called\n"));
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189 if (!initialized) {
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190 if (no_cleanup)
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191 _exit(0);
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192 else
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193 exit(0);
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194 }
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195 }
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196
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197 void
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198 PyThread_exit_thread(void)
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199 {
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200 do_PyThread_exit_thread(0);
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201 }
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202
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203 void
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204 PyThread__exit_thread(void)
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205 {
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206 do_PyThread_exit_thread(1);
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207 }
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208
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209 #ifndef NO_EXIT_PROG
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210 static void
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211 do_PyThread_exit_prog(int status, int no_cleanup)
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212 {
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213 dprintf(("PyThread_exit_prog(%d) called\n", status));
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214 if (!initialized)
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215 if (no_cleanup)
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216 _exit(status);
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217 else
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218 exit(status);
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219 }
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220
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221 void
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222 PyThread_exit_prog(int status)
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223 {
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224 do_PyThread_exit_prog(status, 0);
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225 }
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226
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227 void
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228 PyThread__exit_prog(int status)
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229 {
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230 do_PyThread_exit_prog(status, 1);
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231 }
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232 #endif /* NO_EXIT_PROG */
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233
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234 /*
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235 * Lock support.
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236 */
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237 PyThread_type_lock
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238 PyThread_allocate_lock(void)
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239 {
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240 pthread_lock *lock;
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241 int status, error = 0;
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242
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243 dprintf(("PyThread_allocate_lock called\n"));
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244 if (!initialized)
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245 PyThread_init_thread();
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246
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247 lock = (pthread_lock *) malloc(sizeof(pthread_lock));
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248 memset((void *)lock, '\0', sizeof(pthread_lock));
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249 if (lock) {
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250 lock->locked = 0;
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251
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252 status = pthread_mutex_init(&lock->mut,
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253 pthread_mutexattr_default);
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254 CHECK_STATUS("pthread_mutex_init");
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255
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256 status = pthread_cond_init(&lock->lock_released,
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257 pthread_condattr_default);
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258 CHECK_STATUS("pthread_cond_init");
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259
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260 if (error) {
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261 free((void *)lock);
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262 lock = 0;
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263 }
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264 }
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265
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266 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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267 return (PyThread_type_lock) lock;
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268 }
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269
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270 void
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271 PyThread_free_lock(PyThread_type_lock lock)
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272 {
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273 pthread_lock *thelock = (pthread_lock *)lock;
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274 int status, error = 0;
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275
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276 dprintf(("PyThread_free_lock(%p) called\n", lock));
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277
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278 status = pthread_mutex_destroy( &thelock->mut );
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279 CHECK_STATUS("pthread_mutex_destroy");
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280
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281 status = pthread_cond_destroy( &thelock->lock_released );
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282 CHECK_STATUS("pthread_cond_destroy");
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283
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284 free((void *)thelock);
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285 }
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286
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287 int
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288 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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289 {
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290 int success;
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291 pthread_lock *thelock = (pthread_lock *)lock;
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292 int status, error = 0;
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293
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294 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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295
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296 status = pthread_mutex_lock( &thelock->mut );
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297 CHECK_STATUS("pthread_mutex_lock[1]");
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298 success = thelock->locked == 0;
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299 if (success) thelock->locked = 1;
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300 status = pthread_mutex_unlock( &thelock->mut );
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301 CHECK_STATUS("pthread_mutex_unlock[1]");
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302
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303 if ( !success && waitflag ) {
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304 /* continue trying until we get the lock */
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305
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306 /* mut must be locked by me -- part of the condition
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307 * protocol */
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308 status = pthread_mutex_lock( &thelock->mut );
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309 CHECK_STATUS("pthread_mutex_lock[2]");
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310 while ( thelock->locked ) {
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311 status = pthread_cond_wait(&thelock->lock_released,
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312 &thelock->mut);
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313 CHECK_STATUS("pthread_cond_wait");
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314 }
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315 thelock->locked = 1;
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316 status = pthread_mutex_unlock( &thelock->mut );
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317 CHECK_STATUS("pthread_mutex_unlock[2]");
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318 success = 1;
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319 }
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320 if (error) success = 0;
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321 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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322 return success;
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323 }
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324
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325 void
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326 PyThread_release_lock(PyThread_type_lock lock)
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327 {
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328 pthread_lock *thelock = (pthread_lock *)lock;
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329 int status, error = 0;
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diff changeset
330
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331 dprintf(("PyThread_release_lock(%p) called\n", lock));
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332
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333 status = pthread_mutex_lock( &thelock->mut );
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334 CHECK_STATUS("pthread_mutex_lock[3]");
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335
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336 thelock->locked = 0;
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337
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338 status = pthread_mutex_unlock( &thelock->mut );
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339 CHECK_STATUS("pthread_mutex_unlock[3]");
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340
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341 /* wake up someone (anyone, if any) waiting on the lock */
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342 status = pthread_cond_signal( &thelock->lock_released );
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343 CHECK_STATUS("pthread_cond_signal");
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344 }
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345
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346 /*
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347 * Semaphore support.
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348 */
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349
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diff changeset
350 struct semaphore {
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diff changeset
351 pthread_mutex_t mutex;
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diff changeset
352 pthread_cond_t cond;
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diff changeset
353 int value;
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354 };
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355
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356 PyThread_type_sema
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diff changeset
357 PyThread_allocate_sema(int value)
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358 {
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359 struct semaphore *sema;
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diff changeset
360 int status, error = 0;
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diff changeset
361
9679
877d23bd5bdc Thanks to Chris Herborth, the thread primitives now have proper Py*
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diff changeset
362 dprintf(("PyThread_allocate_sema called\n"));
1628
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363 if (!initialized)
9679
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diff changeset
364 PyThread_init_thread();
1628
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365
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366 sema = (struct semaphore *) malloc(sizeof(struct semaphore));
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diff changeset
367 if (sema != NULL) {
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diff changeset
368 sema->value = value;
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diff changeset
369 status = pthread_mutex_init(&sema->mutex,
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diff changeset
370 pthread_mutexattr_default);
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diff changeset
371 CHECK_STATUS("pthread_mutex_init");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
372 status = pthread_cond_init(&sema->cond,
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diff changeset
373 pthread_condattr_default);
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diff changeset
374 CHECK_STATUS("pthread_cond_init");
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diff changeset
375 if (error) {
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diff changeset
376 free((void *) sema);
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diff changeset
377 sema = NULL;
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diff changeset
378 }
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diff changeset
379 }
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380 dprintf(("PyThread_allocate_sema() -> %p\n", sema));
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381 return (PyThread_type_sema) sema;
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382 }
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383
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diff changeset
384 void
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diff changeset
385 PyThread_free_sema(PyThread_type_sema sema)
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386 {
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387 int status, error = 0;
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diff changeset
388 struct semaphore *thesema = (struct semaphore *) sema;
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diff changeset
389
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diff changeset
390 dprintf(("PyThread_free_sema(%p) called\n", sema));
4994
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diff changeset
391 status = pthread_cond_destroy(&thesema->cond);
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diff changeset
392 CHECK_STATUS("pthread_cond_destroy");
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diff changeset
393 status = pthread_mutex_destroy(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
394 CHECK_STATUS("pthread_mutex_destroy");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
395 free((void *) thesema);
1628
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diff changeset
396 }
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diff changeset
397
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diff changeset
398 int
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diff changeset
399 PyThread_down_sema(PyThread_type_sema sema, int waitflag)
1628
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400 {
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diff changeset
401 int status, error = 0, success;
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diff changeset
402 struct semaphore *thesema = (struct semaphore *) sema;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
403
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diff changeset
404 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
diff changeset
405 status = pthread_mutex_lock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
406 CHECK_STATUS("pthread_mutex_lock");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
407 if (waitflag) {
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
408 while (!error && thesema->value <= 0) {
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
409 status = pthread_cond_wait(&thesema->cond,
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
410 &thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
411 CHECK_STATUS("pthread_cond_wait");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
412 }
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
413 }
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
414 if (error)
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
415 success = 0;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
416 else if (thesema->value > 0) {
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
417 thesema->value--;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
418 success = 1;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
419 }
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
420 else
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
421 success = 0;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
422 status = pthread_mutex_unlock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
423 CHECK_STATUS("pthread_mutex_unlock");
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
424 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
425 return success;
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
426 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
427
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
428 void
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
429 PyThread_up_sema(PyThread_type_sema sema)
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
430 {
4994
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
431 int status, error = 0;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
432 struct semaphore *thesema = (struct semaphore *) sema;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
433
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
434 dprintf(("PyThread_up_sema(%p)\n", sema));
4994
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
435 status = pthread_mutex_lock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
436 CHECK_STATUS("pthread_mutex_lock");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
437 thesema->value++;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
438 status = pthread_cond_signal(&thesema->cond);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
439 CHECK_STATUS("pthread_cond_signal");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
440 status = pthread_mutex_unlock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
441 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
442 }