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annotate Python/thread.c @ 67047:e3af5f3a7904 v3.2b2

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#3243 follow-up: remove debugging print and fix docs; data is a bytes object.
author Georg Brandl <georg@python.org>
date Sun, 19 Dec 2010 12:33:52 +0000
parents cab14be0ada1
children 3c9232a684ae
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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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 #include "pythread.h"
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28 #ifndef _POSIX_THREADS
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30 #ifdef __sgi
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31 #define SGI_THREADS
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32 #endif
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33
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34 #ifdef HAVE_THREAD_H
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35 #define SOLARIS_THREADS
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36 #endif
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37
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38 #if defined(sun) && !defined(SOLARIS_THREADS)
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39 #define SUN_LWP
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40 #endif
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41
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42 /* Check if we're running on HP-UX and _SC_THREADS is defined. If so, then
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43 enough of the Posix threads package is implimented to support python
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44 threads.
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45
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46 This is valid for HP-UX 11.23 running on an ia64 system. If needed, add
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47 a check of __ia64 to verify that we're running on a ia64 system instead
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48 of a pa-risc system.
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49 */
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50 #ifdef __hpux
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51 #ifdef _SC_THREADS
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52 #define _POSIX_THREADS
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53 #endif
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54 #endif
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55
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56 #endif /* _POSIX_THREADS */
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59 #ifdef Py_DEBUG
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60 static int thread_debug = 0;
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61 #define dprintf(args) (void)((thread_debug & 1) && printf args)
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62 #define d2printf(args) ((thread_debug & 8) && printf args)
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63 #else
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64 #define dprintf(args)
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65 #define d2printf(args)
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66 #endif
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67
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68 static int initialized;
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69
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70 static void PyThread__init_thread(void); /* Forward */
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71
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72 void
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73 PyThread_init_thread(void)
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74 {
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75 #ifdef Py_DEBUG
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76 char *p = Py_GETENV("PYTHONTHREADDEBUG");
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77
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78 if (p) {
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79 if (*p)
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80 thread_debug = atoi(p);
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81 else
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82 thread_debug = 1;
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83 }
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84 #endif /* Py_DEBUG */
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85 if (initialized)
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86 return;
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87 initialized = 1;
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88 dprintf(("PyThread_init_thread called\n"));
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89 PyThread__init_thread();
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90 }
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91
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92 /* Support for runtime thread stack size tuning.
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93 A value of 0 means using the platform's default stack size
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94 or the size specified by the THREAD_STACK_SIZE macro. */
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95 static size_t _pythread_stacksize = 0;
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96
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97 #ifdef SGI_THREADS
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98 #error SGI Irix threads are now unsupported, and code will be removed in 3.3.
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99 #include "thread_sgi.h"
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100 #endif
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101
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102 #ifdef SOLARIS_THREADS
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103 #include "thread_solaris.h"
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104 #endif
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105
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106 #ifdef SUN_LWP
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107 #error SunOS lightweight processes are now unsupported, and code will be removed in 3.3.
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108 #include "thread_lwp.h"
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109 #endif
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110
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111 #ifdef HAVE_PTH
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112 #error GNU pth threads are now unsupported, and code will be removed in 3.3.
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113 #include "thread_pth.h"
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114 #undef _POSIX_THREADS
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115 #endif
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116
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117 #ifdef _POSIX_THREADS
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118 #include "thread_pthread.h"
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119 #endif
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120
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121 #ifdef C_THREADS
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122 #error Mach C Threads are now unsupported, and code will be removed in 3.3.
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123 #include "thread_cthread.h"
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124 #endif
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125
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126 #ifdef NT_THREADS
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127 #include "thread_nt.h"
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128 #endif
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129
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130 #ifdef OS2_THREADS
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131 #include "thread_os2.h"
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132 #endif
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133
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134 #ifdef PLAN9_THREADS
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135 #include "thread_plan9.h"
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136 #endif
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137
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138 /*
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139 #ifdef FOOBAR_THREADS
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140 #include "thread_foobar.h"
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141 #endif
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142 */
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143
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144 /* return the current thread stack size */
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145 size_t
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146 PyThread_get_stacksize(void)
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147 {
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148 return _pythread_stacksize;
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149 }
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150
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151 /* Only platforms defining a THREAD_SET_STACKSIZE() macro
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152 in thread_<platform>.h support changing the stack size.
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153 Return 0 if stack size is valid,
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154 -1 if stack size value is invalid,
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155 -2 if setting stack size is not supported. */
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156 int
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157 PyThread_set_stacksize(size_t size)
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158 {
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159 #if defined(THREAD_SET_STACKSIZE)
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160 return THREAD_SET_STACKSIZE(size);
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161 #else
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162 return -2;
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163 #endif
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164 }
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165
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166 #ifndef Py_HAVE_NATIVE_TLS
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167 /* If the platform has not supplied a platform specific
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168 TLS implementation, provide our own.
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169
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170 This code stolen from "thread_sgi.h", where it was the only
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171 implementation of an existing Python TLS API.
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172 */
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173 /* ------------------------------------------------------------------------
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174 Per-thread data ("key") support.
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175
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176 Use PyThread_create_key() to create a new key. This is typically shared
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177 across threads.
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178
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179 Use PyThread_set_key_value(thekey, value) to associate void* value with
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180 thekey in the current thread. Each thread has a distinct mapping of thekey
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181 to a void* value. Caution: if the current thread already has a mapping
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182 for thekey, value is ignored.
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183
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184 Use PyThread_get_key_value(thekey) to retrieve the void* value associated
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185 with thekey in the current thread. This returns NULL if no value is
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186 associated with thekey in the current thread.
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187
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188 Use PyThread_delete_key_value(thekey) to forget the current thread's associated
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189 value for thekey. PyThread_delete_key(thekey) forgets the values associated
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190 with thekey across *all* threads.
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191
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192 While some of these functions have error-return values, none set any
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193 Python exception.
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194
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195 None of the functions does memory management on behalf of the void* values.
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196 You need to allocate and deallocate them yourself. If the void* values
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197 happen to be PyObject*, these functions don't do refcount operations on
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198 them either.
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199
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200 The GIL does not need to be held when calling these functions; they supply
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201 their own locking. This isn't true of PyThread_create_key(), though (see
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202 next paragraph).
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203
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204 There's a hidden assumption that PyThread_create_key() will be called before
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205 any of the other functions are called. There's also a hidden assumption
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206 that calls to PyThread_create_key() are serialized externally.
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207 ------------------------------------------------------------------------ */
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208
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209 /* A singly-linked list of struct key objects remembers all the key->value
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210 * associations. File static keyhead heads the list. keymutex is used
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211 * to enforce exclusion internally.
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212 */
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213 struct key {
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214 /* Next record in the list, or NULL if this is the last record. */
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215 struct key *next;
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216
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217 /* The thread id, according to PyThread_get_thread_ident(). */
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218 long id;
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219
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220 /* The key and its associated value. */
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221 int key;
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222 void *value;
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223 };
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224
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225 static struct key *keyhead = NULL;
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226 static PyThread_type_lock keymutex = NULL;
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227 static int nkeys = 0; /* PyThread_create_key() hands out nkeys+1 next */
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228
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229 /* Internal helper.
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230 * If the current thread has a mapping for key, the appropriate struct key*
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231 * is returned. NB: value is ignored in this case!
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232 * If there is no mapping for key in the current thread, then:
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233 * If value is NULL, NULL is returned.
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234 * Else a mapping of key to value is created for the current thread,
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235 * and a pointer to a new struct key* is returned; except that if
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236 * malloc() can't find room for a new struct key*, NULL is returned.
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237 * So when value==NULL, this acts like a pure lookup routine, and when
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238 * value!=NULL, this acts like dict.setdefault(), returning an existing
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239 * mapping if one exists, else creating a new mapping.
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240 *
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241 * Caution: this used to be too clever, trying to hold keymutex only
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242 * around the "p->next = keyhead; keyhead = p" pair. That allowed
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243 * another thread to mutate the list, via key deletion, concurrent with
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244 * find_key() crawling over the list. Hilarity ensued. For example, when
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245 * the for-loop here does "p = p->next", p could end up pointing at a
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246 * record that PyThread_delete_key_value() was concurrently free()'ing.
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247 * That could lead to anything, from failing to find a key that exists, to
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248 * segfaults. Now we lock the whole routine.
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249 */
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250 static struct key *
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251 find_key(int key, void *value)
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252 {
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253 struct key *p, *prev_p;
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254 long id = PyThread_get_thread_ident();
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255
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256 if (!keymutex)
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257 return NULL;
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258 PyThread_acquire_lock(keymutex, 1);
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259 prev_p = NULL;
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260 for (p = keyhead; p != NULL; p = p->next) {
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261 if (p->id == id && p->key == key)
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262 goto Done;
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263 /* Sanity check. These states should never happen but if
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264 * they do we must abort. Otherwise we'll end up spinning in
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265 * in a tight loop with the lock held. A similar check is done
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266 * in pystate.c tstate_delete_common(). */
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267 if (p == prev_p)
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268 Py_FatalError("tls find_key: small circular list(!)");
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269 prev_p = p;
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270 if (p->next == keyhead)
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271 Py_FatalError("tls find_key: circular list(!)");
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272 }
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273 if (value == NULL) {
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274 assert(p == NULL);
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275 goto Done;
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276 }
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277 p = (struct key *)malloc(sizeof(struct key));
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278 if (p != NULL) {
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279 p->id = id;
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280 p->key = key;
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281 p->value = value;
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282 p->next = keyhead;
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283 keyhead = p;
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284 }
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285 Done:
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286 PyThread_release_lock(keymutex);
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287 return p;
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288 }
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289
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290 /* Return a new key. This must be called before any other functions in
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291 * this family, and callers must arrange to serialize calls to this
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292 * function. No violations are detected.
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293 */
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294 int
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295 PyThread_create_key(void)
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296 {
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297 /* All parts of this function are wrong if it's called by multiple
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298 * threads simultaneously.
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299 */
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300 if (keymutex == NULL)
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301 keymutex = PyThread_allocate_lock();
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302 return ++nkeys;
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303 }
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304
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305 /* Forget the associations for key across *all* threads. */
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306 void
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307 PyThread_delete_key(int key)
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308 {
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309 struct key *p, **q;
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310
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311 PyThread_acquire_lock(keymutex, 1);
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312 q = &keyhead;
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313 while ((p = *q) != NULL) {
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314 if (p->key == key) {
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315 *q = p->next;
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316 free((void *)p);
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317 /* NB This does *not* free p->value! */
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318 }
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319 else
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320 q = &p->next;
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321 }
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322 PyThread_release_lock(keymutex);
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323 }
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324
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325 /* Confusing: If the current thread has an association for key,
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326 * value is ignored, and 0 is returned. Else an attempt is made to create
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327 * an association of key to value for the current thread. 0 is returned
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328 * if that succeeds, but -1 is returned if there's not enough memory
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329 * to create the association. value must not be NULL.
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330 */
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331 int
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332 PyThread_set_key_value(int key, void *value)
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333 {
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334 struct key *p;
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335
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336 assert(value != NULL);
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337 p = find_key(key, value);
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338 if (p == NULL)
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339 return -1;
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340 else
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341 return 0;
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342 }
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343
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344 /* Retrieve the value associated with key in the current thread, or NULL
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345 * if the current thread doesn't have an association for key.
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346 */
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347 void *
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348 PyThread_get_key_value(int key)
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349 {
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350 struct key *p = find_key(key, NULL);
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351
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352 if (p == NULL)
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353 return NULL;
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354 else
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355 return p->value;
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356 }
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357
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358 /* Forget the current thread's association for key, if any. */
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359 void
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360 PyThread_delete_key_value(int key)
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361 {
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362 long id = PyThread_get_thread_ident();
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363 struct key *p, **q;
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364
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365 PyThread_acquire_lock(keymutex, 1);
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366 q = &keyhead;
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367 while ((p = *q) != NULL) {
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368 if (p->key == key && p->id == id) {
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369 *q = p->next;
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370 free((void *)p);
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371 /* NB This does *not* free p->value! */
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372 break;
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373 }
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374 else
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375 q = &p->next;
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376 }
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377 PyThread_release_lock(keymutex);
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378 }
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379
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380 /* Forget everything not associated with the current thread id.
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381 * This function is called from PyOS_AfterFork(). It is necessary
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382 * because other thread ids which were in use at the time of the fork
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383 * may be reused for new threads created in the forked process.
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384 */
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385 void
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386 PyThread_ReInitTLS(void)
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387 {
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388 long id = PyThread_get_thread_ident();
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389 struct key *p, **q;
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390
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391 if (!keymutex)
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392 return;
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393
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394 /* As with interpreter_lock in PyEval_ReInitThreads()
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395 we just create a new lock without freeing the old one */
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396 keymutex = PyThread_allocate_lock();
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397
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398 /* Delete all keys which do not match the current thread id */
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399 q = &keyhead;
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400 while ((p = *q) != NULL) {
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401 if (p->id != id) {
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402 *q = p->next;
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403 free((void *)p);
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404 /* NB This does *not* free p->value! */
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405 }
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406 else
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407 q = &p->next;
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408 }
47665
71cb7ea4f110 Merged revisions 64212 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 44587
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409 }
71cb7ea4f110 Merged revisions 64212 via svnmerge from
Benjamin Peterson <benjamin@python.org>
parents: 44587
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410
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 24315
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411 #endif /* Py_HAVE_NATIVE_TLS */