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annotate Python/thread_pthread.h @ 5493:ef93d51dab36 legacy-trunk

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Support for various versions of the pthread draft.
author Guido van Rossum <guido@python.org>
date Tue, 13 May 1997 17:51:13 +0000
parents 2c81d7d68ed3
children f5decc5d7073
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1 /***********************************************************
2062
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 ******************************************************************/
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31
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32 /* Posix threads interface */
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33
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34 #include <stdlib.h>
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35 #include <pthread.h>
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36
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37
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38 /* try to determine what version of the Pthread Standard is installed.
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39 * this is important, since all sorts of parameter types changed from
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40 * draft to draft and there are several (incompatible) drafts in
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41 * common use. these macros are a start, at least.
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42 * 12 May 1997 -- david arnold <davida@pobox.com>
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43 */
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44
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45 #if defined(__ultrix) && defined(__mips) && defined(_DECTHREADS_)
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46 /* _DECTHREADS_ is defined in cma.h which is included by pthread.h */
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47 # define PY_PTHREAD_D4
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48
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49 #elif defined(__osf__) && defined (__alpha)
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50 /* _DECTHREADS_ is defined in cma.h which is included by pthread.h */
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51 # if !defined(_PTHREAD_ENV_ALPHA) || defined(_PTHREAD_USE_D4) || defined(PTHREAD_USE_D4)
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52 # define PY_PTHREAD_D4
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53 # else
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54 # define PY_PTHREAD_STD
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55 # endif
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56
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57 #elif defined(_AIX)
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58 /* SCHED_BG_NP is defined if using AIX DCE pthreads
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59 * but it is unsupported by AIX 4 pthreads. Default
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60 * attributes for AIX 4 pthreads equal to NULL. For
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61 * AIX DCE pthreads they should be left unchanged.
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62 */
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63 # if !defined(SCHED_BG_NP)
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64 # define PY_PTHREAD_STD
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65 # else
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66 # define PY_PTHREAD_D7
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67 # endif
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68
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69 #elif defined(__unix) && defined(__sparc)
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70 # define PY_PTHREAD_STD
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71
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72 #endif
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73
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74
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75 /* set default attribute object for different versions */
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76
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77 #if defined(PY_PTHREAD_D4) || defined(PY_PTHREAD_D7)
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78 # define pthread_attr_default pthread_attr_default
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79 # define pthread_mutexattr_default pthread_mutexattr_default
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80 # define pthread_condattr_default pthread_condattr_default
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81 #elif defined(PY_PTHREAD_STD)
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82 # define pthread_attr_default ((pthread_attr_t *)NULL)
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83 # define pthread_mutexattr_default ((pthread_mutexattr_t *)NULL)
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84 # define pthread_condattr_default ((pthread_condattr_t *)NULL)
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85 #endif
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86
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87
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88 /* A pthread mutex isn't sufficient to model the Python lock type
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89 * because, according to Draft 5 of the docs (P1003.4a/D5), both of the
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90 * following are undefined:
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91 * -> a thread tries to lock a mutex it already has locked
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92 * -> a thread tries to unlock a mutex locked by a different thread
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93 * pthread mutexes are designed for serializing threads over short pieces
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94 * of code anyway, so wouldn't be an appropriate implementation of
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95 * Python's locks regardless.
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96 *
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97 * The pthread_lock struct implements a Python lock as a "locked?" bit
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98 * and a <condition, mutex> pair. In general, if the bit can be acquired
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99 * instantly, it is, else the pair is used to block the thread until the
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100 * bit is cleared. 9 May 1994 tim@ksr.com
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101 */
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102
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103 typedef struct {
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104 char locked; /* 0=unlocked, 1=locked */
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105 /* a <cond, mutex> pair to handle an acquire of a locked lock */
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106 pthread_cond_t lock_released;
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107 pthread_mutex_t mut;
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108 } pthread_lock;
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109
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110 #define CHECK_STATUS(name) if (status < 0) { perror(name); error=1; }
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111
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112 /*
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113 * Initialization.
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114 */
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115 static void _init_thread _P0()
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116 {
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117 }
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118
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119 /*
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120 * Thread support.
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121 */
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122
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123
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124 int start_new_thread _P2(func, void (*func) _P((void *)), arg, void *arg)
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125 {
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126 pthread_t th;
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127 int success;
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128 dprintf(("start_new_thread called\n"));
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129 if (!initialized)
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130 init_thread();
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131
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132 success = pthread_create(&th,
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133 #if defined(PY_PTHREAD_D4)
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134 pthread_attr_default,
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135 (pthread_startroutine_t)func,
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136 (pthread_addr_t)arg
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137 #elif defined(PY_PTHREAD_D7)
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138 pthread_attr_default,
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139 func,
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140 arg
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141 #elif defined(PY_PTHREAD_STD)
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142 (pthread_attr_t*)NULL,
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143 (void* (*)_P((void *)))func,
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144 (void *)arg
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145 #endif
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146 );
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147
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148 if (success >= 0) {
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149 #if defined(PY_THREAD_D4) || defined(PY_PTHREAD_D7)
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150 pthread_detach(&th);
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151 #elif defined(PY_PTHREAD_STD)
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152 pthread_detach(th);
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153 #endif
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154 }
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155 return success < 0 ? 0 : 1;
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156 }
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157
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158 long get_thread_ident _P0()
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159 {
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160 pthread_t threadid;
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161 if (!initialized)
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162 init_thread();
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163 /* Jump through some hoops for Alpha OSF/1 */
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164 threadid = pthread_self();
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165 return (long) *(long *) &threadid;
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166 }
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167
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168 static void do_exit_thread _P1(no_cleanup, int no_cleanup)
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169 {
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170 dprintf(("exit_thread called\n"));
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171 if (!initialized)
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172 if (no_cleanup)
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173 _exit(0);
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174 else
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175 exit(0);
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176 }
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177
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178 void exit_thread _P0()
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179 {
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180 do_exit_thread(0);
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181 }
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182
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183 void _exit_thread _P0()
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184 {
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185 do_exit_thread(1);
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186 }
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187
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188 #ifndef NO_EXIT_PROG
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189 static void do_exit_prog _P2(status, int status, no_cleanup, int no_cleanup)
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190 {
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191 dprintf(("exit_prog(%d) called\n", status));
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192 if (!initialized)
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193 if (no_cleanup)
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194 _exit(status);
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195 else
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196 exit(status);
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197 }
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198
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199 void exit_prog _P1(status, int status)
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200 {
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201 do_exit_prog(status, 0);
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202 }
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203
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204 void _exit_prog _P1(status, int status)
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205 {
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206 do_exit_prog(status, 1);
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207 }
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208 #endif /* NO_EXIT_PROG */
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209
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210 /*
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211 * Lock support.
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212 */
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213 type_lock allocate_lock _P0()
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214 {
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215 pthread_lock *lock;
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216 int status, error = 0;
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217
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218 dprintf(("allocate_lock called\n"));
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219 if (!initialized)
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220 init_thread();
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221
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222 lock = (pthread_lock *) malloc(sizeof(pthread_lock));
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223 if (lock) {
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224 lock->locked = 0;
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225
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226 status = pthread_mutex_init(&lock->mut,
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227 pthread_mutexattr_default);
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228 CHECK_STATUS("pthread_mutex_init");
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229
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230 status = pthread_cond_init(&lock->lock_released,
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231 pthread_condattr_default);
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232 CHECK_STATUS("pthread_cond_init");
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233
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234 if (error) {
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235 free((void *)lock);
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236 lock = 0;
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237 }
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238 }
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239
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240 dprintf(("allocate_lock() -> %lx\n", (long)lock));
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241 return (type_lock) lock;
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242 }
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243
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244 void free_lock _P1(lock, type_lock lock)
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245 {
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246 pthread_lock *thelock = (pthread_lock *)lock;
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247 int status, error = 0;
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248
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249 dprintf(("free_lock(%lx) called\n", (long)lock));
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250
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251 status = pthread_mutex_destroy( &thelock->mut );
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252 CHECK_STATUS("pthread_mutex_destroy");
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253
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254 status = pthread_cond_destroy( &thelock->lock_released );
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255 CHECK_STATUS("pthread_cond_destroy");
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256
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257 free((void *)thelock);
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258 }
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259
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260 int acquire_lock _P2(lock, type_lock lock, waitflag, int waitflag)
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261 {
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262 int success;
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263 pthread_lock *thelock = (pthread_lock *)lock;
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264 int status, error = 0;
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265
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266 dprintf(("acquire_lock(%lx, %d) called\n", (long)lock, waitflag));
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267
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268 status = pthread_mutex_lock( &thelock->mut );
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269 CHECK_STATUS("pthread_mutex_lock[1]");
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270 success = thelock->locked == 0;
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271 if (success) thelock->locked = 1;
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272 status = pthread_mutex_unlock( &thelock->mut );
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273 CHECK_STATUS("pthread_mutex_unlock[1]");
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274
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275 if ( !success && waitflag ) {
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276 /* continue trying until we get the lock */
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277
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278 /* mut must be locked by me -- part of the condition
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279 * protocol */
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280 status = pthread_mutex_lock( &thelock->mut );
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281 CHECK_STATUS("pthread_mutex_lock[2]");
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282 while ( thelock->locked ) {
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283 status = pthread_cond_wait(&thelock->lock_released,
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284 &thelock->mut);
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285 CHECK_STATUS("pthread_cond_wait");
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286 }
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287 thelock->locked = 1;
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288 status = pthread_mutex_unlock( &thelock->mut );
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289 CHECK_STATUS("pthread_mutex_unlock[2]");
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290 success = 1;
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291 }
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292 if (error) success = 0;
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293 dprintf(("acquire_lock(%lx, %d) -> %d\n", (long)lock, waitflag, success));
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294 return success;
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295 }
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296
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297 void release_lock _P1(lock, type_lock lock)
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298 {
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299 pthread_lock *thelock = (pthread_lock *)lock;
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300 int status, error = 0;
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301
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302 dprintf(("release_lock(%lx) called\n", (long)lock));
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303
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304 status = pthread_mutex_lock( &thelock->mut );
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305 CHECK_STATUS("pthread_mutex_lock[3]");
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306
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307 thelock->locked = 0;
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308
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309 status = pthread_mutex_unlock( &thelock->mut );
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310 CHECK_STATUS("pthread_mutex_unlock[3]");
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311
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312 /* wake up someone (anyone, if any) waiting on the lock */
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313 status = pthread_cond_signal( &thelock->lock_released );
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314 CHECK_STATUS("pthread_cond_signal");
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315 }
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316
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317 /*
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318 * Semaphore support.
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319 */
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320
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321 struct semaphore {
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322 pthread_mutex_t mutex;
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323 pthread_cond_t cond;
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324 int value;
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325 };
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326
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327 type_sema allocate_sema _P1(value, int value)
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328 {
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329 struct semaphore *sema;
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330 int status, error = 0;
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331
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332 dprintf(("allocate_sema called\n"));
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333 if (!initialized)
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334 init_thread();
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335
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336 sema = (struct semaphore *) malloc(sizeof(struct semaphore));
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337 if (sema != NULL) {
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338 sema->value = value;
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339 status = pthread_mutex_init(&sema->mutex,
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340 pthread_mutexattr_default);
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341 CHECK_STATUS("pthread_mutex_init");
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342 status = pthread_cond_init(&sema->cond,
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343 pthread_condattr_default);
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344 CHECK_STATUS("pthread_cond_init");
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345 if (error) {
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346 free((void *) sema);
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347 sema = NULL;
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348 }
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349 }
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350 dprintf(("allocate_sema() -> %lx\n", (long) sema));
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351 return (type_sema) sema;
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352 }
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353
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354 void free_sema _P1(sema, type_sema sema)
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355 {
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356 int status, error = 0;
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357 struct semaphore *thesema = (struct semaphore *) sema;
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diff changeset
358
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359 dprintf(("free_sema(%lx) called\n", (long) sema));
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9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
360 status = pthread_cond_destroy(&thesema->cond);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
361 CHECK_STATUS("pthread_cond_destroy");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
362 status = pthread_mutex_destroy(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
363 CHECK_STATUS("pthread_mutex_destroy");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
364 free((void *) thesema);
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365 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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diff changeset
366
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diff changeset
367 int down_sema _P2(sema, type_sema sema, waitflag, int waitflag)
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368 {
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diff changeset
369 int status, error = 0, success;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
370 struct semaphore *thesema = (struct semaphore *) sema;
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diff changeset
371
4371
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diff changeset
372 dprintf(("down_sema(%lx, %d) called\n", (long) sema, waitflag));
4994
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
373 status = pthread_mutex_lock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
374 CHECK_STATUS("pthread_mutex_lock");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
375 if (waitflag) {
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
376 while (!error && thesema->value <= 0) {
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
377 status = pthread_cond_wait(&thesema->cond,
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
378 &thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
379 CHECK_STATUS("pthread_cond_wait");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
380 }
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
381 }
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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parents: 4503
diff changeset
382 if (error)
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
383 success = 0;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
384 else if (thesema->value > 0) {
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
385 thesema->value--;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
386 success = 1;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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parents: 4503
diff changeset
387 }
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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parents: 4503
diff changeset
388 else
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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parents: 4503
diff changeset
389 success = 0;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
390 status = pthread_mutex_unlock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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parents: 4503
diff changeset
391 CHECK_STATUS("pthread_mutex_unlock");
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392 dprintf(("down_sema(%lx) return\n", (long) sema));
4994
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
393 return success;
1628
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diff changeset
394 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
395
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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diff changeset
396 void up_sema _P1(sema, type_sema sema)
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diff changeset
397 {
4994
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diff changeset
398 int status, error = 0;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
399 struct semaphore *thesema = (struct semaphore *) sema;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
400
1628
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diff changeset
401 dprintf(("up_sema(%lx)\n", (long) sema));
4994
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
402 status = pthread_mutex_lock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
403 CHECK_STATUS("pthread_mutex_lock");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
404 thesema->value++;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
405 status = pthread_cond_signal(&thesema->cond);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
406 CHECK_STATUS("pthread_cond_signal");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
407 status = pthread_mutex_unlock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
408 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
409 }