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annotate Python/thread.c @ 50616:fc0000682bfe legacy-trunk

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Issue #1180193: When importing a module from a .pyc (or .pyo) file with an existing .py counterpart, override the co_filename attributes of all code objects if the original filename is obsolete (which can happen if the file has been renamed, moved, or if it is accessed through different paths). Patch by Ziga Seilnacht and Jean-Paul Calderone.
author Antoine Pitrou <solipsis@pitrou.net>
date Tue, 06 Jan 2009 18:10:47 +0000
parents a8a8232cb541
children e38335d4df91 8540268040ff
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 /* Check if we're running on HP-UX and _SC_THREADS is defined. If so, then
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49 enough of the Posix threads package is implimented to support python
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50 threads.
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51
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52 This is valid for HP-UX 11.23 running on an ia64 system. If needed, add
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53 a check of __ia64 to verify that we're running on a ia64 system instead
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54 of a pa-risc system.
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55 */
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56 #ifdef __hpux
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57 #ifdef _SC_THREADS
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58 #define _POSIX_THREADS
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59 #endif
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60 #endif
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61
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62 #endif /* _POSIX_THREADS */
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64
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65 #ifdef Py_DEBUG
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66 static int thread_debug = 0;
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67 #define dprintf(args) (void)((thread_debug & 1) && printf args)
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68 #define d2printf(args) ((thread_debug & 8) && printf args)
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69 #else
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70 #define dprintf(args)
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71 #define d2printf(args)
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72 #endif
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73
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74 static int initialized;
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75
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76 static void PyThread__init_thread(void); /* Forward */
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77
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78 void
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79 PyThread_init_thread(void)
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80 {
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81 #ifdef Py_DEBUG
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82 char *p = Py_GETENV("PYTHONTHREADDEBUG");
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83
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84 if (p) {
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85 if (*p)
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86 thread_debug = atoi(p);
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87 else
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88 thread_debug = 1;
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89 }
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90 #endif /* Py_DEBUG */
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91 if (initialized)
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92 return;
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93 initialized = 1;
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94 dprintf(("PyThread_init_thread called\n"));
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95 PyThread__init_thread();
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96 }
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97
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98 /* Support for runtime thread stack size tuning.
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99 A value of 0 means using the platform's default stack size
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100 or the size specified by the THREAD_STACK_SIZE macro. */
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101 static size_t _pythread_stacksize = 0;
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102
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103 #ifdef SGI_THREADS
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104 #include "thread_sgi.h"
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105 #endif
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106
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107 #ifdef SOLARIS_THREADS
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108 #include "thread_solaris.h"
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109 #endif
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110
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111 #ifdef SUN_LWP
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112 #include "thread_lwp.h"
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113 #endif
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114
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115 #ifdef HAVE_PTH
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116 #include "thread_pth.h"
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117 #undef _POSIX_THREADS
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118 #endif
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119
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120 #ifdef _POSIX_THREADS
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121 #include "thread_pthread.h"
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122 #endif
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123
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124 #ifdef C_THREADS
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125 #include "thread_cthread.h"
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126 #endif
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127
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128 #ifdef NT_THREADS
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129 #include "thread_nt.h"
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130 #endif
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131
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132 #ifdef OS2_THREADS
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133 #include "thread_os2.h"
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134 #endif
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135
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136 #ifdef BEOS_THREADS
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137 #include "thread_beos.h"
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138 #endif
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139
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140 #ifdef WINCE_THREADS
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141 #include "thread_wince.h"
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142 #endif
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143
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144 #ifdef PLAN9_THREADS
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145 #include "thread_plan9.h"
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146 #endif
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147
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148 #ifdef ATHEOS_THREADS
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149 #include "thread_atheos.h"
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150 #endif
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151
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152 /*
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153 #ifdef FOOBAR_THREADS
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154 #include "thread_foobar.h"
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155 #endif
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156 */
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157
38794
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158 /* return the current thread stack size */
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159 size_t
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160 PyThread_get_stacksize(void)
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161 {
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162 return _pythread_stacksize;
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163 }
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164
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165 /* Only platforms defining a THREAD_SET_STACKSIZE() macro
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166 in thread_<platform>.h support changing the stack size.
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167 Return 0 if stack size is valid,
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168 -1 if stack size value is invalid,
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169 -2 if setting stack size is not supported. */
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170 int
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171 PyThread_set_stacksize(size_t size)
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172 {
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173 #if defined(THREAD_SET_STACKSIZE)
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174 return THREAD_SET_STACKSIZE(size);
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175 #else
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176 return -2;
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177 #endif
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178 }
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179
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180 #ifndef Py_HAVE_NATIVE_TLS
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181 /* If the platform has not supplied a platform specific
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182 TLS implementation, provide our own.
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183
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184 This code stolen from "thread_sgi.h", where it was the only
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185 implementation of an existing Python TLS API.
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186 */
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187 /* ------------------------------------------------------------------------
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188 Per-thread data ("key") support.
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189
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190 Use PyThread_create_key() to create a new key. This is typically shared
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191 across threads.
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192
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193 Use PyThread_set_key_value(thekey, value) to associate void* value with
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194 thekey in the current thread. Each thread has a distinct mapping of thekey
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195 to a void* value. Caution: if the current thread already has a mapping
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196 for thekey, value is ignored.
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197
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198 Use PyThread_get_key_value(thekey) to retrieve the void* value associated
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199 with thekey in the current thread. This returns NULL if no value is
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200 associated with thekey in the current thread.
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201
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202 Use PyThread_delete_key_value(thekey) to forget the current thread's associated
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203 value for thekey. PyThread_delete_key(thekey) forgets the values associated
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204 with thekey across *all* threads.
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205
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206 While some of these functions have error-return values, none set any
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207 Python exception.
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208
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209 None of the functions does memory management on behalf of the void* values.
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210 You need to allocate and deallocate them yourself. If the void* values
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211 happen to be PyObject*, these functions don't do refcount operations on
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212 them either.
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213
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214 The GIL does not need to be held when calling these functions; they supply
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215 their own locking. This isn't true of PyThread_create_key(), though (see
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216 next paragraph).
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217
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218 There's a hidden assumption that PyThread_create_key() will be called before
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219 any of the other functions are called. There's also a hidden assumption
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220 that calls to PyThread_create_key() are serialized externally.
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221 ------------------------------------------------------------------------ */
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222
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223 /* A singly-linked list of struct key objects remembers all the key->value
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224 * associations. File static keyhead heads the list. keymutex is used
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225 * to enforce exclusion internally.
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226 */
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227 struct key {
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228 /* Next record in the list, or NULL if this is the last record. */
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229 struct key *next;
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230
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231 /* The thread id, according to PyThread_get_thread_ident(). */
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232 long id;
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233
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234 /* The key and its associated value. */
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235 int key;
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236 void *value;
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237 };
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238
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239 static struct key *keyhead = NULL;
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240 static PyThread_type_lock keymutex = NULL;
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241 static int nkeys = 0; /* PyThread_create_key() hands out nkeys+1 next */
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242
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243 /* Internal helper.
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244 * If the current thread has a mapping for key, the appropriate struct key*
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245 * is returned. NB: value is ignored in this case!
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246 * If there is no mapping for key in the current thread, then:
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247 * If value is NULL, NULL is returned.
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248 * Else a mapping of key to value is created for the current thread,
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249 * and a pointer to a new struct key* is returned; except that if
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250 * malloc() can't find room for a new struct key*, NULL is returned.
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251 * So when value==NULL, this acts like a pure lookup routine, and when
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252 * value!=NULL, this acts like dict.setdefault(), returning an existing
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253 * mapping if one exists, else creating a new mapping.
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254 *
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255 * Caution: this used to be too clever, trying to hold keymutex only
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256 * around the "p->next = keyhead; keyhead = p" pair. That allowed
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257 * another thread to mutate the list, via key deletion, concurrent with
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258 * find_key() crawling over the list. Hilarity ensued. For example, when
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259 * the for-loop here does "p = p->next", p could end up pointing at a
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260 * record that PyThread_delete_key_value() was concurrently free()'ing.
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261 * That could lead to anything, from failing to find a key that exists, to
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262 * segfaults. Now we lock the whole routine.
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263 */
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264 static struct key *
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265 find_key(int key, void *value)
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266 {
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267 struct key *p, *prev_p;
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268 long id = PyThread_get_thread_ident();
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269
39131
7c09b66f04bd Handle more memory allocation failures without crashing.
Neal Norwitz <nnorwitz@gmail.com>
parents: 38794
diff changeset
270 if (!keymutex)
7c09b66f04bd Handle more memory allocation failures without crashing.
Neal Norwitz <nnorwitz@gmail.com>
parents: 38794
diff changeset
271 return NULL;
33712
baa2653f7a76 find_key(): This routine wasn't thread-correct, and accounts for the
Tim Peters <tim.peters@gmail.com>
parents: 33705
diff changeset
272 PyThread_acquire_lock(keymutex, 1);
48167
a8a8232cb541 Adds a sanity check to avoid a *very rare* infinite loop due to a corrupt tls
Gregory P. Smith <greg@mad-scientist.com>
parents: 47664
diff changeset
273 prev_p = NULL;
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
274 for (p = keyhead; p != NULL; p = p->next) {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
275 if (p->id == id && p->key == key)
33712
baa2653f7a76 find_key(): This routine wasn't thread-correct, and accounts for the
Tim Peters <tim.peters@gmail.com>
parents: 33705
diff changeset
276 goto Done;
48167
a8a8232cb541 Adds a sanity check to avoid a *very rare* infinite loop due to a corrupt tls
Gregory P. Smith <greg@mad-scientist.com>
parents: 47664
diff changeset
277 /* Sanity check. These states should never happen but if
a8a8232cb541 Adds a sanity check to avoid a *very rare* infinite loop due to a corrupt tls
Gregory P. Smith <greg@mad-scientist.com>
parents: 47664
diff changeset
278 * they do we must abort. Otherwise we'll end up spinning in
a8a8232cb541 Adds a sanity check to avoid a *very rare* infinite loop due to a corrupt tls
Gregory P. Smith <greg@mad-scientist.com>
parents: 47664
diff changeset
279 * in a tight loop with the lock held. A similar check is done
a8a8232cb541 Adds a sanity check to avoid a *very rare* infinite loop due to a corrupt tls
Gregory P. Smith <greg@mad-scientist.com>
parents: 47664
diff changeset
280 * in pystate.c tstate_delete_common(). */
a8a8232cb541 Adds a sanity check to avoid a *very rare* infinite loop due to a corrupt tls
Gregory P. Smith <greg@mad-scientist.com>
parents: 47664
diff changeset
281 if (p == prev_p)
a8a8232cb541 Adds a sanity check to avoid a *very rare* infinite loop due to a corrupt tls
Gregory P. Smith <greg@mad-scientist.com>
parents: 47664
diff changeset
282 Py_FatalError("tls find_key: small circular list(!)");
a8a8232cb541 Adds a sanity check to avoid a *very rare* infinite loop due to a corrupt tls
Gregory P. Smith <greg@mad-scientist.com>
parents: 47664
diff changeset
283 prev_p = p;
a8a8232cb541 Adds a sanity check to avoid a *very rare* infinite loop due to a corrupt tls
Gregory P. Smith <greg@mad-scientist.com>
parents: 47664
diff changeset
284 if (p->next == keyhead)
a8a8232cb541 Adds a sanity check to avoid a *very rare* infinite loop due to a corrupt tls
Gregory P. Smith <greg@mad-scientist.com>
parents: 47664
diff changeset
285 Py_FatalError("tls find_key: circular list(!)");
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
286 }
33712
baa2653f7a76 find_key(): This routine wasn't thread-correct, and accounts for the
Tim Peters <tim.peters@gmail.com>
parents: 33705
diff changeset
287 if (value == NULL) {
baa2653f7a76 find_key(): This routine wasn't thread-correct, and accounts for the
Tim Peters <tim.peters@gmail.com>
parents: 33705
diff changeset
288 assert(p == NULL);
baa2653f7a76 find_key(): This routine wasn't thread-correct, and accounts for the
Tim Peters <tim.peters@gmail.com>
parents: 33705
diff changeset
289 goto Done;
baa2653f7a76 find_key(): This routine wasn't thread-correct, and accounts for the
Tim Peters <tim.peters@gmail.com>
parents: 33705
diff changeset
290 }
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
291 p = (struct key *)malloc(sizeof(struct key));
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
292 if (p != NULL) {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
293 p->id = id;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
294 p->key = key;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
295 p->value = value;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
296 p->next = keyhead;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
297 keyhead = p;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
298 }
33712
baa2653f7a76 find_key(): This routine wasn't thread-correct, and accounts for the
Tim Peters <tim.peters@gmail.com>
parents: 33705
diff changeset
299 Done:
baa2653f7a76 find_key(): This routine wasn't thread-correct, and accounts for the
Tim Peters <tim.peters@gmail.com>
parents: 33705
diff changeset
300 PyThread_release_lock(keymutex);
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
301 return p;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
302 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
303
33705
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Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
304 /* Return a new key. This must be called before any other functions in
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
305 * this family, and callers must arrange to serialize calls to this
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
306 * function. No violations are detected.
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
307 */
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
308 int
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
309 PyThread_create_key(void)
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
310 {
33705
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
311 /* All parts of this function are wrong if it's called by multiple
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
312 * threads simultaneously.
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
313 */
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
314 if (keymutex == NULL)
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
315 keymutex = PyThread_allocate_lock();
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
316 return ++nkeys;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
317 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
318
33705
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
319 /* Forget the associations for key across *all* threads. */
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
320 void
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
321 PyThread_delete_key(int key)
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
322 {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
323 struct key *p, **q;
33705
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
324
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
325 PyThread_acquire_lock(keymutex, 1);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
326 q = &keyhead;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
327 while ((p = *q) != NULL) {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
328 if (p->key == key) {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
329 *q = p->next;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
330 free((void *)p);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
331 /* NB This does *not* free p->value! */
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
332 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
333 else
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
334 q = &p->next;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
335 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
336 PyThread_release_lock(keymutex);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
337 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
338
33705
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
339 /* Confusing: If the current thread has an association for key,
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
340 * value is ignored, and 0 is returned. Else an attempt is made to create
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
341 * an association of key to value for the current thread. 0 is returned
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
342 * if that succeeds, but -1 is returned if there's not enough memory
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
343 * to create the association. value must not be NULL.
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
344 */
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
345 int
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
346 PyThread_set_key_value(int key, void *value)
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
347 {
33705
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
348 struct key *p;
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
349
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
350 assert(value != NULL);
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
351 p = find_key(key, value);
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
352 if (p == NULL)
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
353 return -1;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
354 else
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
355 return 0;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
356 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
357
33705
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
358 /* Retrieve the value associated with key in the current thread, or NULL
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
359 * if the current thread doesn't have an association for key.
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
360 */
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
361 void *
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
362 PyThread_get_key_value(int key)
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
363 {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
364 struct key *p = find_key(key, NULL);
33705
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
365
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
366 if (p == NULL)
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
367 return NULL;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
368 else
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
369 return p->value;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
370 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
371
33705
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
372 /* Forget the current thread's association for key, if any. */
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
373 void
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
374 PyThread_delete_key_value(int key)
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
375 {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
376 long id = PyThread_get_thread_ident();
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
377 struct key *p, **q;
33705
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
378
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
379 PyThread_acquire_lock(keymutex, 1);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
380 q = &keyhead;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
381 while ((p = *q) != NULL) {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
382 if (p->key == key && p->id == id) {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
383 *q = p->next;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
384 free((void *)p);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
385 /* NB This does *not* free p->value! */
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
386 break;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
387 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
388 else
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
389 q = &p->next;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
390 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
391 PyThread_release_lock(keymutex);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
392 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
393
47664
db99f8752710 #1683 prevent forking from interfering in threading storage
Benjamin Peterson <benjamin@python.org>
parents: 44569
diff changeset
394 /* Forget everything not associated with the current thread id.
db99f8752710 #1683 prevent forking from interfering in threading storage
Benjamin Peterson <benjamin@python.org>
parents: 44569
diff changeset
395 * This function is called from PyOS_AfterFork(). It is necessary
db99f8752710 #1683 prevent forking from interfering in threading storage
Benjamin Peterson <benjamin@python.org>
parents: 44569
diff changeset
396 * because other thread ids which were in use at the time of the fork
db99f8752710 #1683 prevent forking from interfering in threading storage
Benjamin Peterson <benjamin@python.org>
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397 * may be reused for new threads created in the forked process.
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398 */
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399 void
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400 PyThread_ReInitTLS(void)
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401 {
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402 long id = PyThread_get_thread_ident();
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403 struct key *p, **q;
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404
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405 if (!keymutex)
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406 return;
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407
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408 /* As with interpreter_lock in PyEval_ReInitThreads()
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409 we just create a new lock without freeing the old one */
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410 keymutex = PyThread_allocate_lock();
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411
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412 /* Delete all keys which do not match the current thread id */
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413 q = &keyhead;
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414 while ((p = *q) != NULL) {
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415 if (p->id != id) {
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416 *q = p->next;
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417 free((void *)p);
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418 /* NB This does *not* free p->value! */
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419 }
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420 else
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421 q = &p->next;
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422 }
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423 }
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424
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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425 #endif /* Py_HAVE_NATIVE_TLS */