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annotate Python/thread_pthread.h @ 8704:83c8adaa084f legacy-trunk

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Added support for two new standard errors: EnvironmentError and OSError. The EnvironmentError serves primarily as the (common implementation) base class for IOError and OSError. OSError is used by posixmodule.c Also added tuple definition of EnvironmentError when using string based exceptions.
author Barry Warsaw <barry@python.org>
date Thu, 23 Jul 1998 15:59:57 +0000
parents 1b4a37f37345
children 5bc64efc65e0
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1 /***********************************************************
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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(__DGUX)
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70 # define PY_PTHREAD_D6
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71
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72 #elif defined(__hpux) && defined(_DECTHREADS_)
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73 # define PY_PTHREAD_D4
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74
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75 #else /* Default case */
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76 # define PY_PTHREAD_STD
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77
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78 #endif
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79
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80
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81 /* set default attribute object for different versions */
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82
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83 #if defined(PY_PTHREAD_D4) || defined(PY_PTHREAD_D7)
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84 # define pthread_attr_default pthread_attr_default
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85 # define pthread_mutexattr_default pthread_mutexattr_default
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86 # define pthread_condattr_default pthread_condattr_default
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87 #elif defined(PY_PTHREAD_STD) || defined(PY_PTHREAD_D6)
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88 # define pthread_attr_default ((pthread_attr_t *)NULL)
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89 # define pthread_mutexattr_default ((pthread_mutexattr_t *)NULL)
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90 # define pthread_condattr_default ((pthread_condattr_t *)NULL)
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91 #endif
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92
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93
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94 /* A pthread mutex isn't sufficient to model the Python lock type
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95 * because, according to Draft 5 of the docs (P1003.4a/D5), both of the
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96 * following are undefined:
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97 * -> a thread tries to lock a mutex it already has locked
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98 * -> a thread tries to unlock a mutex locked by a different thread
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99 * pthread mutexes are designed for serializing threads over short pieces
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100 * of code anyway, so wouldn't be an appropriate implementation of
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101 * Python's locks regardless.
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102 *
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103 * The pthread_lock struct implements a Python lock as a "locked?" bit
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104 * and a <condition, mutex> pair. In general, if the bit can be acquired
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105 * instantly, it is, else the pair is used to block the thread until the
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106 * bit is cleared. 9 May 1994 tim@ksr.com
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107 */
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108
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109 typedef struct {
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110 char locked; /* 0=unlocked, 1=locked */
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111 /* a <cond, mutex> pair to handle an acquire of a locked lock */
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112 pthread_cond_t lock_released;
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113 pthread_mutex_t mut;
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114 } pthread_lock;
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115
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116 #define CHECK_STATUS(name) if (status < 0) { perror(name); error=1; }
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117
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118 /*
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119 * Initialization.
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120 */
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121 static void _init_thread _P0()
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122 {
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123 }
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124
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125 /*
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126 * Thread support.
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127 */
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128
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129
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130 int start_new_thread _P2(func, void (*func) _P((void *)), arg, void *arg)
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131 {
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132 pthread_t th;
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133 int success;
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134 dprintf(("start_new_thread called\n"));
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135 if (!initialized)
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136 init_thread();
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137
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138 success = pthread_create(&th,
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139 #if defined(PY_PTHREAD_D4)
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140 pthread_attr_default,
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141 (pthread_startroutine_t)func,
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142 (pthread_addr_t)arg
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143 #elif defined(PY_PTHREAD_D6)
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144 pthread_attr_default,
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145 (void* (*)_P((void *)))func,
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146 arg
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147 #elif defined(PY_PTHREAD_D7)
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148 pthread_attr_default,
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149 func,
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150 arg
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151 #elif defined(PY_PTHREAD_STD)
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152 (pthread_attr_t*)NULL,
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153 (void* (*)_P((void *)))func,
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154 (void *)arg
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155 #endif
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156 );
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157
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158 if (success >= 0) {
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159 #if defined(PY_THREAD_D4) || defined(PY_PTHREAD_D6) || defined(PY_PTHREAD_D7)
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160 pthread_detach(&th);
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161 #elif defined(PY_PTHREAD_STD)
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162 pthread_detach(th);
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163 #endif
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164 }
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165 return success < 0 ? 0 : 1;
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166 }
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167
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168 long get_thread_ident _P0()
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169 {
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170 pthread_t threadid;
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171 if (!initialized)
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172 init_thread();
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173 /* Jump through some hoops for Alpha OSF/1 */
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174 threadid = pthread_self();
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175 return (long) *(long *) &threadid;
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176 }
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177
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178 static void do_exit_thread _P1(no_cleanup, int no_cleanup)
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179 {
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180 dprintf(("exit_thread called\n"));
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181 if (!initialized) {
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182 if (no_cleanup)
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183 _exit(0);
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184 else
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185 exit(0);
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186 }
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187 }
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188
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189 void exit_thread _P0()
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190 {
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191 do_exit_thread(0);
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192 }
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193
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194 void _exit_thread _P0()
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195 {
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196 do_exit_thread(1);
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197 }
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198
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199 #ifndef NO_EXIT_PROG
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200 static void do_exit_prog _P2(status, int status, no_cleanup, int no_cleanup)
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201 {
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202 dprintf(("exit_prog(%d) called\n", status));
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203 if (!initialized)
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204 if (no_cleanup)
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205 _exit(status);
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206 else
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207 exit(status);
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208 }
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209
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210 void exit_prog _P1(status, int status)
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211 {
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212 do_exit_prog(status, 0);
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213 }
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214
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215 void _exit_prog _P1(status, int status)
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216 {
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217 do_exit_prog(status, 1);
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218 }
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219 #endif /* NO_EXIT_PROG */
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220
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221 /*
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222 * Lock support.
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223 */
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224 type_lock allocate_lock _P0()
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225 {
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226 pthread_lock *lock;
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227 int status, error = 0;
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228
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229 dprintf(("allocate_lock called\n"));
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230 if (!initialized)
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231 init_thread();
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232
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233 lock = (pthread_lock *) malloc(sizeof(pthread_lock));
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234 if (lock) {
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235 lock->locked = 0;
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236
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237 status = pthread_mutex_init(&lock->mut,
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238 pthread_mutexattr_default);
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239 CHECK_STATUS("pthread_mutex_init");
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240
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241 status = pthread_cond_init(&lock->lock_released,
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242 pthread_condattr_default);
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243 CHECK_STATUS("pthread_cond_init");
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244
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245 if (error) {
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246 free((void *)lock);
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247 lock = 0;
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248 }
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249 }
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250
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251 dprintf(("allocate_lock() -> %lx\n", (long)lock));
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252 return (type_lock) lock;
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253 }
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254
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255 void free_lock _P1(lock, type_lock lock)
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256 {
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257 pthread_lock *thelock = (pthread_lock *)lock;
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258 int status, error = 0;
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259
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260 dprintf(("free_lock(%lx) called\n", (long)lock));
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261
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262 status = pthread_mutex_destroy( &thelock->mut );
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263 CHECK_STATUS("pthread_mutex_destroy");
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264
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265 status = pthread_cond_destroy( &thelock->lock_released );
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266 CHECK_STATUS("pthread_cond_destroy");
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267
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268 free((void *)thelock);
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269 }
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270
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271 int acquire_lock _P2(lock, type_lock lock, waitflag, int waitflag)
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272 {
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273 int success;
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274 pthread_lock *thelock = (pthread_lock *)lock;
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275 int status, error = 0;
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276
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277 dprintf(("acquire_lock(%lx, %d) called\n", (long)lock, waitflag));
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278
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279 status = pthread_mutex_lock( &thelock->mut );
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280 CHECK_STATUS("pthread_mutex_lock[1]");
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281 success = thelock->locked == 0;
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282 if (success) thelock->locked = 1;
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283 status = pthread_mutex_unlock( &thelock->mut );
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284 CHECK_STATUS("pthread_mutex_unlock[1]");
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285
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diff changeset
286 if ( !success && waitflag ) {
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287 /* continue trying until we get the lock */
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288
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289 /* mut must be locked by me -- part of the condition
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290 * protocol */
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291 status = pthread_mutex_lock( &thelock->mut );
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292 CHECK_STATUS("pthread_mutex_lock[2]");
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293 while ( thelock->locked ) {
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294 status = pthread_cond_wait(&thelock->lock_released,
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295 &thelock->mut);
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296 CHECK_STATUS("pthread_cond_wait");
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297 }
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298 thelock->locked = 1;
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299 status = pthread_mutex_unlock( &thelock->mut );
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300 CHECK_STATUS("pthread_mutex_unlock[2]");
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301 success = 1;
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302 }
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303 if (error) success = 0;
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304 dprintf(("acquire_lock(%lx, %d) -> %d\n", (long)lock, waitflag, success));
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305 return success;
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306 }
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307
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308 void release_lock _P1(lock, type_lock lock)
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309 {
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310 pthread_lock *thelock = (pthread_lock *)lock;
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311 int status, error = 0;
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312
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313 dprintf(("release_lock(%lx) called\n", (long)lock));
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314
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315 status = pthread_mutex_lock( &thelock->mut );
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316 CHECK_STATUS("pthread_mutex_lock[3]");
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317
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318 thelock->locked = 0;
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319
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320 status = pthread_mutex_unlock( &thelock->mut );
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321 CHECK_STATUS("pthread_mutex_unlock[3]");
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322
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323 /* wake up someone (anyone, if any) waiting on the lock */
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324 status = pthread_cond_signal( &thelock->lock_released );
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325 CHECK_STATUS("pthread_cond_signal");
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326 }
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327
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328 /*
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329 * Semaphore support.
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330 */
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331
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332 struct semaphore {
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333 pthread_mutex_t mutex;
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334 pthread_cond_t cond;
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335 int value;
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336 };
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337
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338 type_sema allocate_sema _P1(value, int value)
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339 {
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340 struct semaphore *sema;
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341 int status, error = 0;
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342
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343 dprintf(("allocate_sema called\n"));
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344 if (!initialized)
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345 init_thread();
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346
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347 sema = (struct semaphore *) malloc(sizeof(struct semaphore));
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348 if (sema != NULL) {
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349 sema->value = value;
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350 status = pthread_mutex_init(&sema->mutex,
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351 pthread_mutexattr_default);
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352 CHECK_STATUS("pthread_mutex_init");
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diff changeset
353 status = pthread_cond_init(&sema->cond,
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diff changeset
354 pthread_condattr_default);
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diff changeset
355 CHECK_STATUS("pthread_cond_init");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
356 if (error) {
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
357 free((void *) sema);
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diff changeset
358 sema = NULL;
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diff changeset
359 }
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
360 }
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361 dprintf(("allocate_sema() -> %lx\n", (long) sema));
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362 return (type_sema) sema;
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diff changeset
363 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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diff changeset
364
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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365 void free_sema _P1(sema, type_sema sema)
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 status, error = 0;
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diff changeset
368 struct semaphore *thesema = (struct semaphore *) sema;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
369
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370 dprintf(("free_sema(%lx) called\n", (long) sema));
4994
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
371 status = pthread_cond_destroy(&thesema->cond);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
372 CHECK_STATUS("pthread_cond_destroy");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
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diff changeset
373 status = pthread_mutex_destroy(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
374 CHECK_STATUS("pthread_mutex_destroy");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
375 free((void *) thesema);
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376 }
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diff changeset
377
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diff changeset
378 int down_sema _P2(sema, type_sema sema, waitflag, int waitflag)
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379 {
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diff changeset
380 int status, error = 0, success;
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diff changeset
381 struct semaphore *thesema = (struct semaphore *) sema;
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diff changeset
382
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diff changeset
383 dprintf(("down_sema(%lx, %d) called\n", (long) sema, waitflag));
4994
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diff changeset
384 status = pthread_mutex_lock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
385 CHECK_STATUS("pthread_mutex_lock");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
386 if (waitflag) {
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
387 while (!error && thesema->value <= 0) {
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
388 status = pthread_cond_wait(&thesema->cond,
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
389 &thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
390 CHECK_STATUS("pthread_cond_wait");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
391 }
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
392 }
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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parents: 4503
diff changeset
393 if (error)
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
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diff changeset
394 success = 0;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
395 else if (thesema->value > 0) {
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
396 thesema->value--;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
397 success = 1;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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parents: 4503
diff changeset
398 }
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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parents: 4503
diff changeset
399 else
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
400 success = 0;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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diff changeset
401 status = pthread_mutex_unlock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
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parents: 4503
diff changeset
402 CHECK_STATUS("pthread_mutex_unlock");
1628
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diff changeset
403 dprintf(("down_sema(%lx) return\n", (long) sema));
4994
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
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diff changeset
404 return success;
1628
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parents:
diff changeset
405 }
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
406
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
407 void up_sema _P1(sema, type_sema sema)
a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
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parents:
diff changeset
408 {
4994
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diff changeset
409 int status, error = 0;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
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410 struct semaphore *thesema = (struct semaphore *) sema;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
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411
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412 dprintf(("up_sema(%lx)\n", (long) sema));
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Guido van Rossum <guido@python.org>
parents: 4503
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413 status = pthread_mutex_lock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
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414 CHECK_STATUS("pthread_mutex_lock");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
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415 thesema->value++;
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
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416 status = pthread_cond_signal(&thesema->cond);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
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417 CHECK_STATUS("pthread_cond_signal");
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
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418 status = pthread_mutex_unlock(&thesema->mutex);
9bc652e9f2b4 Working semaphore implementation by Sjoerd.
Guido van Rossum <guido@python.org>
parents: 4503
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419 CHECK_STATUS("pthread_mutex_unlock");
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420 }