Mercurial > cpython-lru_cache-weakref

annotate Python/thread_pthread.h @ 13956:8e8a8df0fe73 legacy-trunk

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The list comp patch checked for the second child node of the 'listmaker' node, without checking if the node actually had more than one child. It can have only one node, though: '[' test ']'. This fixes it.
author Thomas Wouters <thomas@python.org>
date Sun, 13 Aug 2000 17:05:17 +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
13210
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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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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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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
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877d23bd5bdc Thanks to Chris Herborth, the thread primitives now have proper Py*
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362 dprintf(("PyThread_allocate_sema called\n"));
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363 if (!initialized)
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diff changeset
364 PyThread_init_thread();
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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");
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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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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);
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diff changeset
394 CHECK_STATUS("pthread_mutex_destroy");
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diff changeset
395 free((void *) thesema);
1628
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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)
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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;
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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
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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 }