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annotate Python/thread.c @ 75733:9fc456ac20cf

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Issue #14325: Stop using python lists, capsules, and the garbage collector to deal with PyArg_Parse* cleanup.
author Jean-Paul Calderone <exarkun@twistedmatrix.com>
date Fri, 16 Mar 2012 08:51:42 -0400
parents f75fd74a0c13
children ffc6e6b00949
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 #ifndef _POSIX_THREADS
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11 /* This means pthreads are not implemented in libc headers, hence the macro
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12 not present in unistd.h. But they still can be implemented as an external
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13 library (e.g. gnu pth in pthread emulation) */
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14 # ifdef HAVE_PTHREAD_H
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15 # include <pthread.h> /* _POSIX_THREADS */
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16 # endif
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17 #endif
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18
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19 #ifndef DONT_HAVE_STDIO_H
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20 #include <stdio.h>
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21 #endif
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22
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23 #include <stdlib.h>
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24
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25 #include "pythread.h"
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27 #ifndef _POSIX_THREADS
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28
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29 /* Check if we're running on HP-UX and _SC_THREADS is defined. If so, then
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30 enough of the Posix threads package is implemented to support python
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31 threads.
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32
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33 This is valid for HP-UX 11.23 running on an ia64 system. If needed, add
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34 a check of __ia64 to verify that we're running on a ia64 system instead
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35 of a pa-risc system.
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36 */
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37 #ifdef __hpux
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38 #ifdef _SC_THREADS
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39 #define _POSIX_THREADS
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40 #endif
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41 #endif
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42
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43 #endif /* _POSIX_THREADS */
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46 #ifdef Py_DEBUG
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47 static int thread_debug = 0;
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48 #define dprintf(args) (void)((thread_debug & 1) && printf args)
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49 #define d2printf(args) ((thread_debug & 8) && printf args)
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50 #else
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51 #define dprintf(args)
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52 #define d2printf(args)
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53 #endif
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54
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55 static int initialized;
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56
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57 static void PyThread__init_thread(void); /* Forward */
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58
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59 void
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60 PyThread_init_thread(void)
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61 {
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62 #ifdef Py_DEBUG
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63 char *p = Py_GETENV("PYTHONTHREADDEBUG");
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64
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65 if (p) {
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66 if (*p)
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67 thread_debug = atoi(p);
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68 else
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69 thread_debug = 1;
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70 }
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71 #endif /* Py_DEBUG */
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72 if (initialized)
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73 return;
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74 initialized = 1;
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75 dprintf(("PyThread_init_thread called\n"));
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76 PyThread__init_thread();
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77 }
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78
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79 /* Support for runtime thread stack size tuning.
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80 A value of 0 means using the platform's default stack size
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81 or the size specified by the THREAD_STACK_SIZE macro. */
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82 static size_t _pythread_stacksize = 0;
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83
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84 #ifdef _POSIX_THREADS
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85 #define PYTHREAD_NAME "pthread"
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86 #include "thread_pthread.h"
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87 #endif
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88
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89 #ifdef NT_THREADS
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90 #define PYTHREAD_NAME "nt"
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91 #include "thread_nt.h"
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92 #endif
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93
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94 #ifdef OS2_THREADS
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95 #define PYTHREAD_NAME "os2"
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96 #include "thread_os2.h"
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97 #endif
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98
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99 /*
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100 #ifdef FOOBAR_THREADS
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101 #include "thread_foobar.h"
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102 #endif
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103 */
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104
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105 /* return the current thread stack size */
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106 size_t
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107 PyThread_get_stacksize(void)
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108 {
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109 return _pythread_stacksize;
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110 }
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111
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112 /* Only platforms defining a THREAD_SET_STACKSIZE() macro
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113 in thread_<platform>.h support changing the stack size.
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114 Return 0 if stack size is valid,
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115 -1 if stack size value is invalid,
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116 -2 if setting stack size is not supported. */
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117 int
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118 PyThread_set_stacksize(size_t size)
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119 {
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120 #if defined(THREAD_SET_STACKSIZE)
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121 return THREAD_SET_STACKSIZE(size);
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122 #else
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123 return -2;
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124 #endif
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125 }
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126
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127 #ifndef Py_HAVE_NATIVE_TLS
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128 /* If the platform has not supplied a platform specific
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129 TLS implementation, provide our own.
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130
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131 This code stolen from "thread_sgi.h", where it was the only
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132 implementation of an existing Python TLS API.
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133 */
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134 /* ------------------------------------------------------------------------
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135 Per-thread data ("key") support.
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136
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137 Use PyThread_create_key() to create a new key. This is typically shared
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138 across threads.
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139
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140 Use PyThread_set_key_value(thekey, value) to associate void* value with
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141 thekey in the current thread. Each thread has a distinct mapping of thekey
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142 to a void* value. Caution: if the current thread already has a mapping
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143 for thekey, value is ignored.
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144
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145 Use PyThread_get_key_value(thekey) to retrieve the void* value associated
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146 with thekey in the current thread. This returns NULL if no value is
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147 associated with thekey in the current thread.
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148
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149 Use PyThread_delete_key_value(thekey) to forget the current thread's associated
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150 value for thekey. PyThread_delete_key(thekey) forgets the values associated
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151 with thekey across *all* threads.
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152
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153 While some of these functions have error-return values, none set any
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154 Python exception.
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155
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156 None of the functions does memory management on behalf of the void* values.
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157 You need to allocate and deallocate them yourself. If the void* values
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158 happen to be PyObject*, these functions don't do refcount operations on
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159 them either.
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160
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161 The GIL does not need to be held when calling these functions; they supply
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162 their own locking. This isn't true of PyThread_create_key(), though (see
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163 next paragraph).
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164
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165 There's a hidden assumption that PyThread_create_key() will be called before
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166 any of the other functions are called. There's also a hidden assumption
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167 that calls to PyThread_create_key() are serialized externally.
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168 ------------------------------------------------------------------------ */
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169
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170 /* A singly-linked list of struct key objects remembers all the key->value
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171 * associations. File static keyhead heads the list. keymutex is used
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172 * to enforce exclusion internally.
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173 */
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174 struct key {
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175 /* Next record in the list, or NULL if this is the last record. */
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176 struct key *next;
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177
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178 /* The thread id, according to PyThread_get_thread_ident(). */
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179 long id;
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180
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181 /* The key and its associated value. */
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182 int key;
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183 void *value;
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184 };
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185
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186 static struct key *keyhead = NULL;
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187 static PyThread_type_lock keymutex = NULL;
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188 static int nkeys = 0; /* PyThread_create_key() hands out nkeys+1 next */
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189
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190 /* Internal helper.
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191 * If the current thread has a mapping for key, the appropriate struct key*
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192 * is returned. NB: value is ignored in this case!
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193 * If there is no mapping for key in the current thread, then:
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194 * If value is NULL, NULL is returned.
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195 * Else a mapping of key to value is created for the current thread,
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196 * and a pointer to a new struct key* is returned; except that if
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197 * malloc() can't find room for a new struct key*, NULL is returned.
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198 * So when value==NULL, this acts like a pure lookup routine, and when
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199 * value!=NULL, this acts like dict.setdefault(), returning an existing
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200 * mapping if one exists, else creating a new mapping.
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201 *
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202 * Caution: this used to be too clever, trying to hold keymutex only
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203 * around the "p->next = keyhead; keyhead = p" pair. That allowed
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204 * another thread to mutate the list, via key deletion, concurrent with
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205 * find_key() crawling over the list. Hilarity ensued. For example, when
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206 * the for-loop here does "p = p->next", p could end up pointing at a
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207 * record that PyThread_delete_key_value() was concurrently free()'ing.
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208 * That could lead to anything, from failing to find a key that exists, to
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209 * segfaults. Now we lock the whole routine.
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210 */
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211 static struct key *
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212 find_key(int key, void *value)
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213 {
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214 struct key *p, *prev_p;
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215 long id = PyThread_get_thread_ident();
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216
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217 if (!keymutex)
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218 return NULL;
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219 PyThread_acquire_lock(keymutex, 1);
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220 prev_p = NULL;
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221 for (p = keyhead; p != NULL; p = p->next) {
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222 if (p->id == id && p->key == key)
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223 goto Done;
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224 /* Sanity check. These states should never happen but if
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225 * they do we must abort. Otherwise we'll end up spinning in
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226 * in a tight loop with the lock held. A similar check is done
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227 * in pystate.c tstate_delete_common(). */
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228 if (p == prev_p)
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229 Py_FatalError("tls find_key: small circular list(!)");
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230 prev_p = p;
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231 if (p->next == keyhead)
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232 Py_FatalError("tls find_key: circular list(!)");
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233 }
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234 if (value == NULL) {
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235 assert(p == NULL);
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236 goto Done;
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237 }
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238 p = (struct key *)malloc(sizeof(struct key));
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239 if (p != NULL) {
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240 p->id = id;
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241 p->key = key;
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242 p->value = value;
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243 p->next = keyhead;
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244 keyhead = p;
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245 }
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246 Done:
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247 PyThread_release_lock(keymutex);
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248 return p;
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249 }
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250
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251 /* Return a new key. This must be called before any other functions in
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252 * this family, and callers must arrange to serialize calls to this
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253 * function. No violations are detected.
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254 */
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255 int
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256 PyThread_create_key(void)
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257 {
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258 /* All parts of this function are wrong if it's called by multiple
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259 * threads simultaneously.
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260 */
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261 if (keymutex == NULL)
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262 keymutex = PyThread_allocate_lock();
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263 return ++nkeys;
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264 }
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265
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266 /* Forget the associations for key across *all* threads. */
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267 void
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268 PyThread_delete_key(int key)
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269 {
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270 struct key *p, **q;
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271
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272 PyThread_acquire_lock(keymutex, 1);
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273 q = &keyhead;
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274 while ((p = *q) != NULL) {
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275 if (p->key == key) {
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276 *q = p->next;
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277 free((void *)p);
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278 /* NB This does *not* free p->value! */
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279 }
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280 else
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281 q = &p->next;
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282 }
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283 PyThread_release_lock(keymutex);
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284 }
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285
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286 /* Confusing: If the current thread has an association for key,
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287 * value is ignored, and 0 is returned. Else an attempt is made to create
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288 * an association of key to value for the current thread. 0 is returned
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289 * if that succeeds, but -1 is returned if there's not enough memory
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290 * to create the association. value must not be NULL.
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291 */
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292 int
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293 PyThread_set_key_value(int key, void *value)
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294 {
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295 struct key *p;
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296
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297 assert(value != NULL);
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298 p = find_key(key, value);
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299 if (p == NULL)
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300 return -1;
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301 else
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302 return 0;
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303 }
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304
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305 /* Retrieve the value associated with key in the current thread, or NULL
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306 * if the current thread doesn't have an association for key.
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307 */
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308 void *
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309 PyThread_get_key_value(int key)
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310 {
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311 struct key *p = find_key(key, NULL);
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312
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313 if (p == NULL)
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314 return NULL;
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315 else
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316 return p->value;
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317 }
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318
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319 /* Forget the current thread's association for key, if any. */
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320 void
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321 PyThread_delete_key_value(int key)
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322 {
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323 long id = PyThread_get_thread_ident();
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324 struct key *p, **q;
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325
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326 PyThread_acquire_lock(keymutex, 1);
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327 q = &keyhead;
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328 while ((p = *q) != NULL) {
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329 if (p->key == key && p->id == id) {
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330 *q = p->next;
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331 free((void *)p);
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332 /* NB This does *not* free p->value! */
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333 break;
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334 }
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335 else
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336 q = &p->next;
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337 }
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338 PyThread_release_lock(keymutex);
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339 }
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340
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341 /* Forget everything not associated with the current thread id.
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342 * This function is called from PyOS_AfterFork(). It is necessary
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343 * because other thread ids which were in use at the time of the fork
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344 * may be reused for new threads created in the forked process.
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345 */
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346 void
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347 PyThread_ReInitTLS(void)
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348 {
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349 long id = PyThread_get_thread_ident();
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350 struct key *p, **q;
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351
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352 if (!keymutex)
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353 return;
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354
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355 /* As with interpreter_lock in PyEval_ReInitThreads()
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356 we just create a new lock without freeing the old one */
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357 keymutex = PyThread_allocate_lock();
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358
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359 /* Delete all keys which do not match the current thread id */
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360 q = &keyhead;
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361 while ((p = *q) != NULL) {
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362 if (p->id != id) {
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363 *q = p->next;
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364 free((void *)p);
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365 /* NB This does *not* free p->value! */
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366 }
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367 else
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368 q = &p->next;
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369 }
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370 }
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371
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372 #endif /* Py_HAVE_NATIVE_TLS */
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373
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374 PyDoc_STRVAR(threadinfo__doc__,
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375 "sys.thread_info\n\
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376 \n\
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377 A struct sequence holding information about the thread implementation.");
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378
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379 static PyStructSequence_Field threadinfo_fields[] = {
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380 {"name", "name of the thread implementation"},
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381 {"lock", "name of the lock implementation"},
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382 {"version", "name and version of the thread library"},
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383 {0}
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384 };
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385
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386 static PyStructSequence_Desc threadinfo_desc = {
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387 "sys.thread_info", /* name */
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388 threadinfo__doc__, /* doc */
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389 threadinfo_fields, /* fields */
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390 3
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391 };
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392
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393 static PyTypeObject ThreadInfoType;
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394
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395 PyObject*
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396 PyThread_GetInfo(void)
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397 {
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398 PyObject *threadinfo, *value;
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399 int pos = 0;
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400 #if (defined(_POSIX_THREADS) && defined(HAVE_CONFSTR) \
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401 && defined(_CS_GNU_LIBPTHREAD_VERSION))
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402 char buffer[255];
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403 int len;
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404 #endif
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405
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406 if (ThreadInfoType.tp_name == 0)
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407 PyStructSequence_InitType(&ThreadInfoType, &threadinfo_desc);
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408
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409 threadinfo = PyStructSequence_New(&ThreadInfoType);
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410 if (threadinfo == NULL)
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411 return NULL;
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412
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413 value = PyUnicode_FromString(PYTHREAD_NAME);
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414 if (value == NULL) {
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415 Py_DECREF(threadinfo);
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416 return NULL;
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417 }
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418 PyStructSequence_SET_ITEM(threadinfo, pos++, value);
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419
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420 #ifdef _POSIX_THREADS
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421 #ifdef USE_SEMAPHORES
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422 value = PyUnicode_FromString("semaphore");
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423 #else
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424 value = PyUnicode_FromString("mutex+cond");
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425 #endif
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426 if (value == NULL) {
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427 Py_DECREF(threadinfo);
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428 return NULL;
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429 }
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430 #else
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431 Py_INCREF(Py_None);
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432 value = Py_None;
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433 #endif
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434 PyStructSequence_SET_ITEM(threadinfo, pos++, value);
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435
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436 #if (defined(_POSIX_THREADS) && defined(HAVE_CONFSTR) \
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437 && defined(_CS_GNU_LIBPTHREAD_VERSION))
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438 value = NULL;
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439 len = confstr(_CS_GNU_LIBPTHREAD_VERSION, buffer, sizeof(buffer));
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440 if (1 < len && len < sizeof(buffer)) {
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441 value = PyUnicode_DecodeFSDefaultAndSize(buffer, len-1);
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442 if (value == NULL)
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443 PyErr_Clear();
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444 }
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445 if (value == NULL)
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446 #endif
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447 {
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448 Py_INCREF(Py_None);
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449 value = Py_None;
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450 }
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451 PyStructSequence_SET_ITEM(threadinfo, pos++, value);
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452 return threadinfo;
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453 }