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annotate Python/thread.c @ 33145:28a205ecb4dd legacy-trunk

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The attached patch fixes FTBFS on GNU/k*BSD. The problem happens on GNU/k*BSD because GNU/k*BSD uses gnu pth to provide pthreads, but will also happen on any system that does the same. python fails to build because it doesn't detect gnu pth in pthread emulation. See C comments in patch for details. patch taken from http://bugs.debian.org/264315
author Matthias Klose <doko@ubuntu.com>
date Mon, 16 Aug 2004 11:35:51 +0000
parents 2abc52c3d4c2
children 0c26db381673
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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2937897a7d8b * Added Fixcprt.py: script to fix copyright message.
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1
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2 /* Thread package.
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3 This is intended to be usable independently from Python.
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4 The implementation for system foobar is in a file thread_foobar.h
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5 which is included by this file dependent on config settings.
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6 Stuff shared by all thread_*.h files is collected here. */
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7
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c64fc56f6072 Include <unistd.h> in Python.h. Fixes #500924.
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8 #include "Python.h"
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9
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10
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11 #ifndef _POSIX_THREADS
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12 /* This means pthreads are not implemented in libc headers, hence the macro
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13 not present in unistd.h. But they still can be implemented as an external
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14 library (e.g. gnu pth in pthread emulation) */
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15 # ifdef HAVE_PTHREAD_H
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16 # include <pthread.h> /* _POSIX_THREADS */
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17 # endif
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18 #endif
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19
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20 #ifndef DONT_HAVE_STDIO_H
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21 #include <stdio.h>
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22 #endif
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23
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24 #include <stdlib.h>
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25
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26 #ifdef __sgi
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27 #ifndef HAVE_PTHREAD_H /* XXX Need to check in configure.in */
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28 #undef _POSIX_THREADS
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29 #endif
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30 #endif
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31
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32 #include "pythread.h"
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33
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34 #ifndef _POSIX_THREADS
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36 #ifdef __sgi
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37 #define SGI_THREADS
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38 #endif
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39
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40 #ifdef HAVE_THREAD_H
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41 #define SOLARIS_THREADS
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42 #endif
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43
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44 #if defined(sun) && !defined(SOLARIS_THREADS)
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45 #define SUN_LWP
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46 #endif
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47
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48 #endif /* _POSIX_THREADS */
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50
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51 #ifdef Py_DEBUG
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52 static int thread_debug = 0;
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53 #define dprintf(args) (void)((thread_debug & 1) && printf args)
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54 #define d2printf(args) ((thread_debug & 8) && printf args)
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55 #else
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56 #define dprintf(args)
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57 #define d2printf(args)
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58 #endif
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59
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60 static int initialized;
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61
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62 static void PyThread__init_thread(void); /* Forward */
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64 void PyThread_init_thread(void)
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65 {
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66 #ifdef Py_DEBUG
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67 char *p = getenv("THREADDEBUG");
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68
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69 if (p) {
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70 if (*p)
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71 thread_debug = atoi(p);
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72 else
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73 thread_debug = 1;
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74 }
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75 #endif /* Py_DEBUG */
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76 if (initialized)
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77 return;
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78 initialized = 1;
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79 dprintf(("PyThread_init_thread called\n"));
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80 PyThread__init_thread();
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81 }
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82
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83 #ifdef SGI_THREADS
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84 #include "thread_sgi.h"
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85 #endif
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86
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87 #ifdef SOLARIS_THREADS
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88 #include "thread_solaris.h"
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89 #endif
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90
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91 #ifdef SUN_LWP
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92 #include "thread_lwp.h"
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93 #endif
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94
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95 #ifdef HAVE_PTH
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96 #include "thread_pth.h"
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97 #undef _POSIX_THREADS
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98 #endif
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99
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100 #ifdef _POSIX_THREADS
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101 #include "thread_pthread.h"
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102 #endif
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103
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104 #ifdef C_THREADS
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105 #include "thread_cthread.h"
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106 #endif
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107
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108 #ifdef NT_THREADS
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109 #include "thread_nt.h"
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110 #endif
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111
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112 #ifdef OS2_THREADS
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113 #include "thread_os2.h"
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114 #endif
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115
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116 #ifdef BEOS_THREADS
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117 #include "thread_beos.h"
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118 #endif
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119
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120 #ifdef WINCE_THREADS
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121 #include "thread_wince.h"
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122 #endif
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123
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124 #ifdef PLAN9_THREADS
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125 #include "thread_plan9.h"
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126 #endif
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127
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128 #ifdef ATHEOS_THREADS
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129 #include "thread_atheos.h"
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130 #endif
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131
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132 /*
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133 #ifdef FOOBAR_THREADS
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134 #include "thread_foobar.h"
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135 #endif
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136 */
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138 #ifndef Py_HAVE_NATIVE_TLS
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139 /* If the platform has not supplied a platform specific
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140 TLS implementation, provide our own.
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141
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142 This code stolen from "thread_sgi.h", where it was the only
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143 implementation of an existing Python TLS API.
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144 */
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145 /*
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146 * Per-thread data ("key") support.
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147 */
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148
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149 struct key {
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150 struct key *next;
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151 long id;
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152 int key;
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153 void *value;
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154 };
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155
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156 static struct key *keyhead = NULL;
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157 static int nkeys = 0;
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158 static PyThread_type_lock keymutex = NULL;
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159
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160 static struct key *find_key(int key, void *value)
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161 {
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162 struct key *p;
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163 long id = PyThread_get_thread_ident();
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164 for (p = keyhead; p != NULL; p = p->next) {
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165 if (p->id == id && p->key == key)
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166 return p;
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167 }
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168 if (value == NULL)
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169 return NULL;
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170 p = (struct key *)malloc(sizeof(struct key));
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171 if (p != NULL) {
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172 p->id = id;
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173 p->key = key;
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174 p->value = value;
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175 PyThread_acquire_lock(keymutex, 1);
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176 p->next = keyhead;
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177 keyhead = p;
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178 PyThread_release_lock(keymutex);
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179 }
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180 return p;
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181 }
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182
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183 int PyThread_create_key(void)
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184 {
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185 if (keymutex == NULL)
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186 keymutex = PyThread_allocate_lock();
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187 return ++nkeys;
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188 }
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189
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190 void PyThread_delete_key(int key)
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191 {
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192 struct key *p, **q;
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193 PyThread_acquire_lock(keymutex, 1);
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194 q = &keyhead;
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195 while ((p = *q) != NULL) {
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196 if (p->key == key) {
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197 *q = p->next;
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198 free((void *)p);
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199 /* NB This does *not* free p->value! */
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200 }
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201 else
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202 q = &p->next;
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203 }
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204 PyThread_release_lock(keymutex);
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205 }
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206
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207 int PyThread_set_key_value(int key, void *value)
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208 {
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209 struct key *p = find_key(key, value);
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210 if (p == NULL)
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211 return -1;
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212 else
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213 return 0;
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214 }
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215
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216 void *PyThread_get_key_value(int key)
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217 {
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218 struct key *p = find_key(key, NULL);
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219 if (p == NULL)
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220 return NULL;
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221 else
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222 return p->value;
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223 }
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224
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225 void PyThread_delete_key_value(int key)
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226 {
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227 long id = PyThread_get_thread_ident();
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228 struct key *p, **q;
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229 PyThread_acquire_lock(keymutex, 1);
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230 q = &keyhead;
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231 while ((p = *q) != NULL) {
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232 if (p->key == key && p->id == id) {
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233 *q = p->next;
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234 free((void *)p);
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235 /* NB This does *not* free p->value! */
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236 break;
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237 }
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238 else
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239 q = &p->next;
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240 }
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241 PyThread_release_lock(keymutex);
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242 }
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243
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244 #endif /* Py_HAVE_NATIVE_TLS */