Mercurial > cpython-lru_cache-weakref

annotate Python/thread_pthread.h @ 16845:09dcf5ebcd80 legacy-trunk

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Now that Jeremy is asking about this code, it looks really bogus to me, so let's rip it out. The constructor for SyntaxError does the right thing, so we do not need to do it again.
author Fred Drake <fdrake@acm.org>
date Wed, 28 Feb 2001 20:58:04 +0000
parents 6f6f965c5e2d
children 2a785b668a16 11a758c56027
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1
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2 /* Posix threads interface */
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3
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4 #include <stdlib.h>
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5 #include <string.h>
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6 #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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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 dprintf(("PyThread_start_new_thread called\n"));
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132 if (!initialized)
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133 PyThread_init_thread();
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134
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135 success = pthread_create(&th,
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136 #if defined(PY_PTHREAD_D4)
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137 pthread_attr_default,
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138 (pthread_startroutine_t)func,
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139 (pthread_addr_t)arg
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140 #elif defined(PY_PTHREAD_D6)
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141 pthread_attr_default,
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142 (void* (*)(void *))func,
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143 arg
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144 #elif defined(PY_PTHREAD_D7)
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145 pthread_attr_default,
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146 func,
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147 arg
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148 #elif defined(PY_PTHREAD_STD)
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149 (pthread_attr_t*)NULL,
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150 (void* (*)(void *))func,
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151 (void *)arg
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152 #endif
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153 );
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154
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155 if (success == 0) {
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156 #if defined(PY_PTHREAD_D4) || defined(PY_PTHREAD_D6) || defined(PY_PTHREAD_D7)
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157 pthread_detach(&th);
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158 #elif defined(PY_PTHREAD_STD)
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159 pthread_detach(th);
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160 #endif
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161 }
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162 return success != 0 ? 0 : 1;
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163 }
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164
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165 /* XXX This implementation is considered (to quote Tim Peters) "inherently
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166 hosed" because:
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167 - It does not guanrantee the promise that a non-zero integer is returned.
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168 - The cast to long is inherently unsafe.
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169 - It is not clear that the 'volatile' (for AIX?) and ugly casting in the
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170 latter return statement (for Alpha OSF/1) are any longer necessary.
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171 */
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172 long
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173 PyThread_get_thread_ident(void)
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174 {
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175 volatile pthread_t threadid;
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176 if (!initialized)
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177 PyThread_init_thread();
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178 /* Jump through some hoops for Alpha OSF/1 */
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179 threadid = pthread_self();
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180 #if SIZEOF_PTHREAD_T <= SIZEOF_LONG
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181 return (long) threadid;
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182 #else
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183 return (long) *(long *) &threadid;
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184 #endif
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185 }
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186
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187 static void
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188 do_PyThread_exit_thread(int no_cleanup)
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189 {
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190 dprintf(("PyThread_exit_thread called\n"));
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191 if (!initialized) {
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192 if (no_cleanup)
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193 _exit(0);
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194 else
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195 exit(0);
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196 }
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197 }
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198
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199 void
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200 PyThread_exit_thread(void)
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201 {
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202 do_PyThread_exit_thread(0);
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203 }
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204
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205 void
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206 PyThread__exit_thread(void)
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207 {
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208 do_PyThread_exit_thread(1);
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209 }
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210
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211 #ifndef NO_EXIT_PROG
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212 static void
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213 do_PyThread_exit_prog(int status, int no_cleanup)
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214 {
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215 dprintf(("PyThread_exit_prog(%d) called\n", status));
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216 if (!initialized)
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217 if (no_cleanup)
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218 _exit(status);
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219 else
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220 exit(status);
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221 }
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222
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223 void
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224 PyThread_exit_prog(int status)
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225 {
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226 do_PyThread_exit_prog(status, 0);
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227 }
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228
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229 void
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230 PyThread__exit_prog(int status)
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231 {
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232 do_PyThread_exit_prog(status, 1);
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233 }
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234 #endif /* NO_EXIT_PROG */
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235
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236 /*
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237 * Lock support.
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238 */
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239 PyThread_type_lock
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240 PyThread_allocate_lock(void)
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241 {
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242 pthread_lock *lock;
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243 int status, error = 0;
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244
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245 dprintf(("PyThread_allocate_lock called\n"));
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246 if (!initialized)
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247 PyThread_init_thread();
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248
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249 lock = (pthread_lock *) malloc(sizeof(pthread_lock));
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250 memset((void *)lock, '\0', sizeof(pthread_lock));
1629
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251 if (lock) {
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252 lock->locked = 0;
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253
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254 status = pthread_mutex_init(&lock->mut,
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255 pthread_mutexattr_default);
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256 CHECK_STATUS("pthread_mutex_init");
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257
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258 status = pthread_cond_init(&lock->lock_released,
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259 pthread_condattr_default);
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260 CHECK_STATUS("pthread_cond_init");
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261
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262 if (error) {
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263 free((void *)lock);
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264 lock = 0;
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265 }
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266 }
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267
13210
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Fred Drake <fdrake@acm.org>
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268 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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269 return (PyThread_type_lock) lock;
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270 }
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271
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272 void
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273 PyThread_free_lock(PyThread_type_lock lock)
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274 {
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275 pthread_lock *thelock = (pthread_lock *)lock;
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276 int status, error = 0;
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277
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278 dprintf(("PyThread_free_lock(%p) called\n", lock));
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279
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280 status = pthread_mutex_destroy( &thelock->mut );
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281 CHECK_STATUS("pthread_mutex_destroy");
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282
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283 status = pthread_cond_destroy( &thelock->lock_released );
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284 CHECK_STATUS("pthread_cond_destroy");
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285
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286 free((void *)thelock);
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287 }
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288
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289 int
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290 PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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291 {
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292 int success;
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293 pthread_lock *thelock = (pthread_lock *)lock;
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294 int status, error = 0;
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295
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296 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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297
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298 status = pthread_mutex_lock( &thelock->mut );
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299 CHECK_STATUS("pthread_mutex_lock[1]");
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300 success = thelock->locked == 0;
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301 if (success) thelock->locked = 1;
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302 status = pthread_mutex_unlock( &thelock->mut );
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303 CHECK_STATUS("pthread_mutex_unlock[1]");
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304
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305 if ( !success && waitflag ) {
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306 /* continue trying until we get the lock */
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307
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308 /* mut must be locked by me -- part of the condition
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309 * protocol */
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310 status = pthread_mutex_lock( &thelock->mut );
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311 CHECK_STATUS("pthread_mutex_lock[2]");
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312 while ( thelock->locked ) {
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313 status = pthread_cond_wait(&thelock->lock_released,
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314 &thelock->mut);
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315 CHECK_STATUS("pthread_cond_wait");
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316 }
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317 thelock->locked = 1;
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318 status = pthread_mutex_unlock( &thelock->mut );
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319 CHECK_STATUS("pthread_mutex_unlock[2]");
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320 success = 1;
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321 }
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322 if (error) success = 0;
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323 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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324 return success;
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325 }
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326
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327 void
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328 PyThread_release_lock(PyThread_type_lock lock)
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329 {
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330 pthread_lock *thelock = (pthread_lock *)lock;
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331 int status, error = 0;
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332
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333 dprintf(("PyThread_release_lock(%p) called\n", lock));
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334
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335 status = pthread_mutex_lock( &thelock->mut );
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336 CHECK_STATUS("pthread_mutex_lock[3]");
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337
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338 thelock->locked = 0;
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339
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340 status = pthread_mutex_unlock( &thelock->mut );
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341 CHECK_STATUS("pthread_mutex_unlock[3]");
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342
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343 /* wake up someone (anyone, if any) waiting on the lock */
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344 status = pthread_cond_signal( &thelock->lock_released );
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345 CHECK_STATUS("pthread_cond_signal");
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346 }
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347
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348 /*
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349 * Semaphore support.
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350 */
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351
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diff changeset
352 struct semaphore {
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diff changeset
353 pthread_mutex_t mutex;
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354 pthread_cond_t cond;
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355 int value;
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356 };
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357
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358 PyThread_type_sema
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359 PyThread_allocate_sema(int value)
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360 {
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361 struct semaphore *sema;
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362 int status, error = 0;
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diff changeset
363
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364 dprintf(("PyThread_allocate_sema called\n"));
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365 if (!initialized)
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366 PyThread_init_thread();
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367
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368 sema = (struct semaphore *) malloc(sizeof(struct semaphore));
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diff changeset
369 if (sema != NULL) {
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diff changeset
370 sema->value = value;
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diff changeset
371 status = pthread_mutex_init(&sema->mutex,
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diff changeset
372 pthread_mutexattr_default);
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diff changeset
373 CHECK_STATUS("pthread_mutex_init");
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374 status = pthread_cond_init(&sema->cond,
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diff changeset
375 pthread_condattr_default);
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376 CHECK_STATUS("pthread_cond_init");
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diff changeset
377 if (error) {
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diff changeset
378 free((void *) sema);
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diff changeset
379 sema = NULL;
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380 }
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diff changeset
381 }
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382 dprintf(("PyThread_allocate_sema() -> %p\n", sema));
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383 return (PyThread_type_sema) sema;
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384 }
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385
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diff changeset
386 void
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387 PyThread_free_sema(PyThread_type_sema sema)
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388 {
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389 int status, error = 0;
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390 struct semaphore *thesema = (struct semaphore *) sema;
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diff changeset
391
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392 dprintf(("PyThread_free_sema(%p) called\n", sema));
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diff changeset
393 status = pthread_cond_destroy(&thesema->cond);
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diff changeset
394 CHECK_STATUS("pthread_cond_destroy");
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diff changeset
395 status = pthread_mutex_destroy(&thesema->mutex);
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diff changeset
396 CHECK_STATUS("pthread_mutex_destroy");
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diff changeset
397 free((void *) thesema);
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398 }
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399
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diff changeset
400 int
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diff changeset
401 PyThread_down_sema(PyThread_type_sema sema, int waitflag)
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402 {
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diff changeset
403 int status, error = 0, success;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
404 struct semaphore *thesema = (struct semaphore *) sema;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
405
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
406 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
407 status = pthread_mutex_lock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
408 CHECK_STATUS("pthread_mutex_lock");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
409 if (waitflag) {
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
410 while (!error && thesema->value <= 0) {
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
411 status = pthread_cond_wait(&thesema->cond,
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
412 &thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
413 CHECK_STATUS("pthread_cond_wait");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
414 }
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
415 }
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
416 if (error)
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
417 success = 0;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
418 else if (thesema->value > 0) {
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
419 thesema->value--;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
420 success = 1;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
421 }
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
422 else
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
423 success = 0;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
424 status = pthread_mutex_unlock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
425 CHECK_STATUS("pthread_mutex_unlock");
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
426 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
427 return success;
1628
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
428 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
429
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
430 void
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
431 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
432 {
4994
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
433 int status, error = 0;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
434 struct semaphore *thesema = (struct semaphore *) sema;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
435
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 10400
diff changeset
436 dprintf(("PyThread_up_sema(%p)\n", sema));
4994
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
437 status = pthread_mutex_lock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
438 CHECK_STATUS("pthread_mutex_lock");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
439 thesema->value++;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
440 status = pthread_cond_signal(&thesema->cond);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
441 CHECK_STATUS("pthread_cond_signal");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
442 status = pthread_mutex_unlock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
443 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
444 }