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annotate Python/thread.c @ 57367:ed30bcffa146 legacy-trunk

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improve several corner cases related with argument names in parenthesis - Fix #7362: give a good error message for parenthesized arguments with defaults. - Add a py3k warning for any parenthesized arguments since those are not allowed in Py3. This warning is not given in tuple unpacking, since that incurs the tuple unpacking warning.
author Benjamin Peterson <benjamin@python.org>
date Thu, 19 Nov 2009 22:54:57 +0000
parents 8540268040ff
children fd25030223b0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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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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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 PLAN9_THREADS
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141 #include "thread_plan9.h"
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142 #endif
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143
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144 #ifdef ATHEOS_THREADS
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145 #include "thread_atheos.h"
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146 #endif
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147
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148 /*
1848
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149 #ifdef FOOBAR_THREADS
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150 #include "thread_foobar.h"
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151 #endif
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152 */
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153
38794
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154 /* return the current thread stack size */
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155 size_t
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156 PyThread_get_stacksize(void)
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157 {
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158 return _pythread_stacksize;
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159 }
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160
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161 /* Only platforms defining a THREAD_SET_STACKSIZE() macro
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162 in thread_<platform>.h support changing the stack size.
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163 Return 0 if stack size is valid,
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164 -1 if stack size value is invalid,
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165 -2 if setting stack size is not supported. */
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166 int
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167 PyThread_set_stacksize(size_t size)
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168 {
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169 #if defined(THREAD_SET_STACKSIZE)
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170 return THREAD_SET_STACKSIZE(size);
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171 #else
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172 return -2;
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173 #endif
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174 }
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175
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176 #ifndef Py_HAVE_NATIVE_TLS
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177 /* If the platform has not supplied a platform specific
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178 TLS implementation, provide our own.
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179
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180 This code stolen from "thread_sgi.h", where it was the only
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181 implementation of an existing Python TLS API.
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182 */
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183 /* ------------------------------------------------------------------------
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184 Per-thread data ("key") support.
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185
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186 Use PyThread_create_key() to create a new key. This is typically shared
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187 across threads.
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188
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189 Use PyThread_set_key_value(thekey, value) to associate void* value with
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190 thekey in the current thread. Each thread has a distinct mapping of thekey
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191 to a void* value. Caution: if the current thread already has a mapping
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192 for thekey, value is ignored.
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193
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194 Use PyThread_get_key_value(thekey) to retrieve the void* value associated
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195 with thekey in the current thread. This returns NULL if no value is
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196 associated with thekey in the current thread.
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197
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198 Use PyThread_delete_key_value(thekey) to forget the current thread's associated
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199 value for thekey. PyThread_delete_key(thekey) forgets the values associated
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200 with thekey across *all* threads.
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201
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202 While some of these functions have error-return values, none set any
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203 Python exception.
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204
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205 None of the functions does memory management on behalf of the void* values.
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206 You need to allocate and deallocate them yourself. If the void* values
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207 happen to be PyObject*, these functions don't do refcount operations on
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208 them either.
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209
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210 The GIL does not need to be held when calling these functions; they supply
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211 their own locking. This isn't true of PyThread_create_key(), though (see
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212 next paragraph).
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213
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214 There's a hidden assumption that PyThread_create_key() will be called before
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215 any of the other functions are called. There's also a hidden assumption
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216 that calls to PyThread_create_key() are serialized externally.
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217 ------------------------------------------------------------------------ */
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218
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219 /* A singly-linked list of struct key objects remembers all the key->value
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220 * associations. File static keyhead heads the list. keymutex is used
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221 * to enforce exclusion internally.
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222 */
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223 struct key {
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224 /* Next record in the list, or NULL if this is the last record. */
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225 struct key *next;
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226
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227 /* The thread id, according to PyThread_get_thread_ident(). */
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228 long id;
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229
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230 /* The key and its associated value. */
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231 int key;
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232 void *value;
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233 };
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234
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235 static struct key *keyhead = NULL;
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236 static PyThread_type_lock keymutex = NULL;
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237 static int nkeys = 0; /* PyThread_create_key() hands out nkeys+1 next */
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238
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239 /* Internal helper.
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240 * If the current thread has a mapping for key, the appropriate struct key*
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241 * is returned. NB: value is ignored in this case!
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242 * If there is no mapping for key in the current thread, then:
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243 * If value is NULL, NULL is returned.
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244 * Else a mapping of key to value is created for the current thread,
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245 * and a pointer to a new struct key* is returned; except that if
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246 * malloc() can't find room for a new struct key*, NULL is returned.
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247 * So when value==NULL, this acts like a pure lookup routine, and when
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248 * value!=NULL, this acts like dict.setdefault(), returning an existing
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249 * mapping if one exists, else creating a new mapping.
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250 *
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251 * Caution: this used to be too clever, trying to hold keymutex only
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252 * around the "p->next = keyhead; keyhead = p" pair. That allowed
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253 * another thread to mutate the list, via key deletion, concurrent with
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254 * find_key() crawling over the list. Hilarity ensued. For example, when
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255 * the for-loop here does "p = p->next", p could end up pointing at a
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256 * record that PyThread_delete_key_value() was concurrently free()'ing.
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257 * That could lead to anything, from failing to find a key that exists, to
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258 * segfaults. Now we lock the whole routine.
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259 */
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260 static struct key *
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261 find_key(int key, void *value)
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262 {
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263 struct key *p, *prev_p;
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264 long id = PyThread_get_thread_ident();
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265
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266 if (!keymutex)
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267 return NULL;
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268 PyThread_acquire_lock(keymutex, 1);
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269 prev_p = NULL;
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a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
270 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
271 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
272 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
273 /* 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
274 * 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
275 * 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
276 * 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
277 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
278 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
279 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
280 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
281 Py_FatalError("tls find_key: circular list(!)");
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
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diff changeset
282 }
33712
baa2653f7a76 find_key(): This routine wasn't thread-correct, and accounts for the
Tim Peters <tim.peters@gmail.com>
parents: 33705
diff changeset
283 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
284 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
285 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
286 }
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
287 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
288 if (p != NULL) {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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parents: 24315
diff changeset
289 p->id = id;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
290 p->key = key;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
291 p->value = value;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
292 p->next = keyhead;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
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diff changeset
293 keyhead = p;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
294 }
33712
baa2653f7a76 find_key(): This routine wasn't thread-correct, and accounts for the
Tim Peters <tim.peters@gmail.com>
parents: 33705
diff changeset
295 Done:
baa2653f7a76 find_key(): This routine wasn't thread-correct, and accounts for the
Tim Peters <tim.peters@gmail.com>
parents: 33705
diff changeset
296 PyThread_release_lock(keymutex);
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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297 return p;
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parents: 24315
diff changeset
298 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
299
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300 /* 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
301 * 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
302 * 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
303 */
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
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304 int
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
305 PyThread_create_key(void)
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
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diff changeset
306 {
33705
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Tim Peters <tim.peters@gmail.com>
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diff changeset
307 /* 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
308 * threads simultaneously.
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
309 */
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
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diff changeset
310 if (keymutex == NULL)
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
311 keymutex = PyThread_allocate_lock();
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
312 return ++nkeys;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
313 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
314
33705
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diff changeset
315 /* 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
316 void
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
317 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
318 {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
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diff changeset
319 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
320
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
321 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
322 q = &keyhead;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
323 while ((p = *q) != NULL) {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
324 if (p->key == key) {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
325 *q = p->next;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
326 free((void *)p);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
327 /* 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
328 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
329 else
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
330 q = &p->next;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
331 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
332 PyThread_release_lock(keymutex);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
333 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
334
33705
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
335 /* 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
336 * 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
337 * 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
338 * 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
339 * 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
340 */
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
341 int
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
342 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
343 {
33705
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
344 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
345
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
346 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
347 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
348 if (p == NULL)
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
349 return -1;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
350 else
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
351 return 0;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
352 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
353
33705
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
354 /* 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
355 * 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
356 */
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
357 void *
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
358 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
359 {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
360 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
361
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
362 if (p == NULL)
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
363 return NULL;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
364 else
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
365 return p->value;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
366 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
367
33705
891042c94aed Document the results of painful reverse-engineering of the "portable TLS"
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
368 /* 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
369 void
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33145
diff changeset
370 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
371 {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
372 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
373 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
374
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
375 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
376 q = &keyhead;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
377 while ((p = *q) != NULL) {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
378 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
379 *q = p->next;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
380 free((void *)p);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
381 /* 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
382 break;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
383 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
384 else
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
385 q = &p->next;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
386 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
387 PyThread_release_lock(keymutex);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
388 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
diff changeset
389
47664
db99f8752710 #1683 prevent forking from interfering in threading storage
Benjamin Peterson <benjamin@python.org>
parents: 44569
diff changeset
390 /* 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
391 * 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
392 * 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>
parents: 44569
diff changeset
393 * may be reused for new threads created in the forked process.
db99f8752710 #1683 prevent forking from interfering in threading storage
Benjamin Peterson <benjamin@python.org>
parents: 44569
diff changeset
394 */
db99f8752710 #1683 prevent forking from interfering in threading storage
Benjamin Peterson <benjamin@python.org>
parents: 44569
diff changeset
395 void
db99f8752710 #1683 prevent forking from interfering in threading storage
Benjamin Peterson <benjamin@python.org>
parents: 44569
diff changeset
396 PyThread_ReInitTLS(void)
db99f8752710 #1683 prevent forking from interfering in threading storage
Benjamin Peterson <benjamin@python.org>
parents: 44569
diff changeset
397 {
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398 long id = PyThread_get_thread_ident();
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399 struct key *p, **q;
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400
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401 if (!keymutex)
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402 return;
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403
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404 /* As with interpreter_lock in PyEval_ReInitThreads()
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405 we just create a new lock without freeing the old one */
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406 keymutex = PyThread_allocate_lock();
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407
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408 /* Delete all keys which do not match the current thread id */
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409 q = &keyhead;
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410 while ((p = *q) != NULL) {
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411 if (p->id != id) {
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412 *q = p->next;
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413 free((void *)p);
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414 /* NB This does *not* free p->value! */
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415 }
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416 else
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417 q = &p->next;
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418 }
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419 }
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420
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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421 #endif /* Py_HAVE_NATIVE_TLS */