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annotate Python/thread.c @ 29223:ea2958bd4271 legacy-trunk

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Remove comment with very long lines that explained what the code used to do. XXX Please be careful when checking in patches to avoid checking in junk that explains what the patched code used to do.
author Jeremy Hylton <jeremy@alum.mit.edu>
date Thu, 22 May 2003 15:47:02 +0000
parents a4154dd5939a
children 1a817694ecbd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1198
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 #ifndef DONT_HAVE_STDIO_H
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11 #include <stdio.h>
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12 #endif
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13
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14 #ifdef HAVE_STDLIB_H
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15 #include <stdlib.h>
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16 #else
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17 #ifdef Py_DEBUG
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18 extern char *getenv(const char *);
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19 #endif
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20 #endif
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21
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22 #ifdef __DGUX
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23 #define _USING_POSIX4A_DRAFT6
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24 #endif
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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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35
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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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457f0df46dd9 Donn Cave <donn@u.washington.edu>:
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48 #if defined(__MWERKS__) && !defined(__BEOS__)
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49 #define _POSIX_THREADS
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50 #endif
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51
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52 #endif /* _POSIX_THREADS */
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53
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54
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55 #ifdef Py_DEBUG
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56 static int thread_debug = 0;
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57 #define dprintf(args) (void)((thread_debug & 1) && printf args)
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58 #define d2printf(args) ((thread_debug & 8) && printf args)
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59 #else
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60 #define dprintf(args)
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61 #define d2printf(args)
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62 #endif
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63
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64 static int initialized;
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65
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9db86b27278f Prototype yet another forward declaration.
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66 static void PyThread__init_thread(void); /* Forward */
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67
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68 void PyThread_init_thread(void)
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69 {
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70 #ifdef Py_DEBUG
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71 char *p = getenv("THREADDEBUG");
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72
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73 if (p) {
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74 if (*p)
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75 thread_debug = atoi(p);
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76 else
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77 thread_debug = 1;
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78 }
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79 #endif /* Py_DEBUG */
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80 if (initialized)
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81 return;
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82 initialized = 1;
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83 dprintf(("PyThread_init_thread called\n"));
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84 PyThread__init_thread();
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85 }
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86
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87 #ifdef SGI_THREADS
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88 #include "thread_sgi.h"
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89 #endif
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90
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91 #ifdef SOLARIS_THREADS
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92 #include "thread_solaris.h"
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93 #endif
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94
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95 #ifdef SUN_LWP
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96 #include "thread_lwp.h"
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97 #endif
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98
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99 #ifdef HAVE_PTH
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100 #include "thread_pth.h"
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101 #endif
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102
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103 #ifdef _POSIX_THREADS
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104 #include "thread_pthread.h"
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105 #endif
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106
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107 #ifdef C_THREADS
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108 #include "thread_cthread.h"
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109 #endif
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110
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111 #ifdef NT_THREADS
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112 #include "thread_nt.h"
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113 #endif
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114
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115 #ifdef OS2_THREADS
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116 #include "thread_os2.h"
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117 #endif
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118
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119 #ifdef BEOS_THREADS
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120 #include "thread_beos.h"
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121 #endif
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122
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123 #ifdef WINCE_THREADS
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124 #include "thread_wince.h"
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125 #endif
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126
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127 #ifdef PLAN9_THREADS
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128 #include "thread_plan9.h"
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129 #endif
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130
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131 #ifdef ATHEOS_THREADS
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132 #include "thread_atheos.h"
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133 #endif
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134
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135 /*
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136 #ifdef FOOBAR_THREADS
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137 #include "thread_foobar.h"
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138 #endif
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139 */
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140
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141 #ifndef Py_HAVE_NATIVE_TLS
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142 /* If the platform has not supplied a platform specific
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143 TLS implementation, provide our own.
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144
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145 This code stolen from "thread_sgi.h", where it was the only
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146 implementation of an existing Python TLS API.
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147 */
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148 /*
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149 * Per-thread data ("key") support.
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150 */
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151
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152 struct key {
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153 struct key *next;
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154 long id;
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155 int key;
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156 void *value;
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157 };
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158
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159 static struct key *keyhead = NULL;
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160 static int nkeys = 0;
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161 static PyThread_type_lock keymutex = NULL;
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162
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163 static struct key *find_key(int key, void *value)
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164 {
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165 struct key *p;
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166 long id = PyThread_get_thread_ident();
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167 for (p = keyhead; p != NULL; p = p->next) {
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168 if (p->id == id && p->key == key)
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169 return p;
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170 }
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171 if (value == NULL)
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172 return NULL;
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173 p = (struct key *)malloc(sizeof(struct key));
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174 if (p != NULL) {
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175 p->id = id;
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176 p->key = key;
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177 p->value = value;
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178 PyThread_acquire_lock(keymutex, 1);
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179 p->next = keyhead;
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180 keyhead = p;
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181 PyThread_release_lock(keymutex);
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182 }
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183 return p;
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184 }
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185
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186 int PyThread_create_key(void)
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187 {
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188 if (keymutex == NULL)
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189 keymutex = PyThread_allocate_lock();
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190 return ++nkeys;
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191 }
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192
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193 void PyThread_delete_key(int key)
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194 {
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195 struct key *p, **q;
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196 PyThread_acquire_lock(keymutex, 1);
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197 q = &keyhead;
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198 while ((p = *q) != NULL) {
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199 if (p->key == key) {
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200 *q = p->next;
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201 free((void *)p);
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202 /* NB This does *not* free p->value! */
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203 }
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204 else
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205 q = &p->next;
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206 }
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207 PyThread_release_lock(keymutex);
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208 }
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209
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210 int PyThread_set_key_value(int key, void *value)
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211 {
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212 struct key *p = find_key(key, value);
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213 if (p == NULL)
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214 return -1;
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215 else
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216 return 0;
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217 }
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218
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219 void *PyThread_get_key_value(int key)
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220 {
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221 struct key *p = find_key(key, NULL);
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222 if (p == NULL)
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223 return NULL;
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224 else
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225 return p->value;
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226 }
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227
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228 void PyThread_delete_key_value(int key)
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229 {
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230 long id = PyThread_get_thread_ident();
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231 struct key *p, **q;
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232 PyThread_acquire_lock(keymutex, 1);
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233 q = &keyhead;
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234 while ((p = *q) != NULL) {
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235 if (p->key == key && p->id == id) {
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236 *q = p->next;
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237 free((void *)p);
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238 /* NB This does *not* free p->value! */
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239 break;
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240 }
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241 else
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242 q = &p->next;
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243 }
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244 PyThread_release_lock(keymutex);
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245 }
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246
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247 #endif /* Py_HAVE_NATIVE_TLS */