Mercurial > cpython-lru_cache-weakref

annotate Modules/threadmodule.c @ 10072:ecebcd84df37 legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
put the preferences file in a folder called "Python" inside the prefs folder, just like the IDE does -- jvr
author Just van Rossum <just@lettererror.com>
date Tue, 02 Feb 1999 15:49:03 +0000
parents 877d23bd5bdc
children dc65c5f6ad7c
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 ******************************************************************/
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31
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32 /* Thread module */
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33 /* Interface to Sjoerd's portable C thread library */
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34
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35 #include "Python.h"
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36
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37 #ifndef WITH_THREAD
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38 #error "Error! The rest of Python is not compiled with thread support."
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39 #error "Rerun configure, adding a --with-thread option."
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40 #error "Then run `make clean' followed by `make'."
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41 #endif
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42
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43 #include "pythread.h"
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44
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45 static PyObject *ThreadError;
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46
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47
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48 /* Lock objects */
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49
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50 typedef struct {
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51 PyObject_HEAD
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52 PyThread_type_lock lock_lock;
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53 } lockobject;
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54
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55 staticforward PyTypeObject Locktype;
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56
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57 static lockobject *
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58 newlockobject()
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59 {
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60 lockobject *self;
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61 self = PyObject_NEW(lockobject, &Locktype);
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62 if (self == NULL)
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63 return NULL;
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64 self->lock_lock = PyThread_allocate_lock();
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65 if (self->lock_lock == NULL) {
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66 PyMem_DEL(self);
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67 self = NULL;
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68 PyErr_SetString(ThreadError, "can't allocate lock");
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69 }
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70 return self;
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71 }
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72
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73 static void
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74 lock_dealloc(self)
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75 lockobject *self;
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76 {
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77 /* Unlock the lock so it's safe to free it */
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78 PyThread_acquire_lock(self->lock_lock, 0);
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79 PyThread_release_lock(self->lock_lock);
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80
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81 PyThread_free_lock(self->lock_lock);
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82 PyMem_DEL(self);
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83 }
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84
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85 static PyObject *
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86 lock_PyThread_acquire_lock(self, args)
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87 lockobject *self;
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88 PyObject *args;
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89 {
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90 int i;
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91
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92 if (args != NULL) {
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93 if (!PyArg_Parse(args, "i", &i))
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94 return NULL;
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95 }
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96 else
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97 i = 1;
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98
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99 Py_BEGIN_ALLOW_THREADS
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100 i = PyThread_acquire_lock(self->lock_lock, i);
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101 Py_END_ALLOW_THREADS
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102
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103 if (args == NULL) {
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104 Py_INCREF(Py_None);
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105 return Py_None;
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106 }
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107 else
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108 return PyInt_FromLong((long)i);
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109 }
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110
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111 static char acquire_doc[] =
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112 "acquire([wait]) -> None or Boolean\n\
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113 (PyThread_acquire_lock() is an obsolete synonym)\n\
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114 \n\
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115 Lock the lock. Without argument, this blocks if the lock is already\n\
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116 locked (even by the same thread), waiting for another thread to release\n\
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117 the lock, and return None when the lock is acquired.\n\
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118 With a Boolean argument, this will only block if the argument is true,\n\
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119 and the return value reflects whether the lock is acquired.\n\
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120 The blocking operation is not interruptible.";
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121
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122 static PyObject *
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123 lock_PyThread_release_lock(self, args)
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124 lockobject *self;
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125 PyObject *args;
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126 {
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127 if (!PyArg_NoArgs(args))
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128 return NULL;
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129
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130 /* Sanity check: the lock must be locked */
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131 if (PyThread_acquire_lock(self->lock_lock, 0)) {
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132 PyThread_release_lock(self->lock_lock);
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133 PyErr_SetString(ThreadError, "release unlocked lock");
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134 return NULL;
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135 }
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136
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137 PyThread_release_lock(self->lock_lock);
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138 Py_INCREF(Py_None);
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139 return Py_None;
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140 }
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141
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142 static char release_doc[] =
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143 "release()\n\
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144 (PyThread_release_lock() is an obsolete synonym)\n\
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145 \n\
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146 Release the lock, allowing another thread that is blocked waiting for\n\
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147 the lock to acquire the lock. The lock must be in the locked state,\n\
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148 but it needn't be locked by the same thread that unlocks it.";
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149
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150 static PyObject *
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151 lock_locked_lock(self, args)
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152 lockobject *self;
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153 PyObject *args;
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154 {
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155 if (!PyArg_NoArgs(args))
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156 return NULL;
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157
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158 if (PyThread_acquire_lock(self->lock_lock, 0)) {
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159 PyThread_release_lock(self->lock_lock);
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160 return PyInt_FromLong(0L);
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161 }
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162 return PyInt_FromLong(1L);
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163 }
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164
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165 static char locked_doc[] =
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166 "locked() -> Boolean\n\
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167 (locked_lock() is an obsolete synonym)\n\
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168 \n\
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169 Return whether the lock is in the locked state.";
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170
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171 static PyMethodDef lock_methods[] = {
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172 {"acquire_lock", (PyCFunction)lock_PyThread_acquire_lock, 0, acquire_doc},
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173 {"acquire", (PyCFunction)lock_PyThread_acquire_lock, 0, acquire_doc},
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174 {"release_lock", (PyCFunction)lock_PyThread_release_lock, 0, release_doc},
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175 {"release", (PyCFunction)lock_PyThread_release_lock, 0, release_doc},
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176 {"locked_lock", (PyCFunction)lock_locked_lock, 0, locked_doc},
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177 {"locked", (PyCFunction)lock_locked_lock, 0, locked_doc},
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178 {NULL, NULL} /* sentinel */
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179 };
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180
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181 static PyObject *
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182 lock_getattr(self, name)
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183 lockobject *self;
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184 char *name;
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185 {
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186 return Py_FindMethod(lock_methods, (PyObject *)self, name);
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187 }
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188
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189 static PyTypeObject Locktype = {
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190 PyObject_HEAD_INIT(&PyType_Type)
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191 0, /*ob_size*/
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192 "lock", /*tp_name*/
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193 sizeof(lockobject), /*tp_size*/
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194 0, /*tp_itemsize*/
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195 /* methods */
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196 (destructor)lock_dealloc, /*tp_dealloc*/
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197 0, /*tp_print*/
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198 (getattrfunc)lock_getattr, /*tp_getattr*/
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199 0, /*tp_setattr*/
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200 0, /*tp_compare*/
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201 0, /*tp_repr*/
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202 };
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203
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204
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205 /* Module functions */
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206
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207 struct bootstate {
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208 PyInterpreterState *interp;
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209 PyObject *func;
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210 PyObject *args;
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211 PyObject *keyw;
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212 };
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213
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214 static void
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215 t_bootstrap(boot_raw)
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216 void *boot_raw;
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217 {
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218 struct bootstate *boot = (struct bootstate *) boot_raw;
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219 PyThreadState *tstate;
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220 PyObject *res;
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221
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222 tstate = PyThreadState_New(boot->interp);
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223 PyEval_AcquireThread(tstate);
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224 res = PyEval_CallObjectWithKeywords(
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225 boot->func, boot->args, boot->keyw);
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226 Py_DECREF(boot->func);
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227 Py_DECREF(boot->args);
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228 Py_XDECREF(boot->keyw);
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229 PyMem_DEL(boot_raw);
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230 if (res == NULL) {
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7cdff8aa8318 t_bootstrap(): Use PyErr_ExceptionMatches(...) instead of PyErr_Occurred(...).
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231 if (PyErr_ExceptionMatches(PyExc_SystemExit))
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232 PyErr_Clear();
2568
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233 else {
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234 fprintf(stderr, "Unhandled exception in thread:\n");
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235 PyErr_PrintEx(0);
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236 }
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237 }
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238 else
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239 Py_DECREF(res);
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240 PyThreadState_Clear(tstate);
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241 PyEval_ReleaseThread(tstate);
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242 PyThreadState_Delete(tstate);
8823
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243 PyThread_exit_thread();
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244 }
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245
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246 static PyObject *
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247 thread_PyThread_start_new_thread(self, fargs)
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248 PyObject *self; /* Not used */
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249 PyObject *fargs;
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250 {
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251 PyObject *func, *args = NULL, *keyw = NULL;
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252 struct bootstate *boot;
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253
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254 if (!PyArg_ParseTuple(fargs, "OO|O", &func, &args, &keyw))
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255 return NULL;
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256 if (!PyCallable_Check(func)) {
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257 PyErr_SetString(PyExc_TypeError,
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258 "first arg must be callable");
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259 return NULL;
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260 }
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261 if (!PyTuple_Check(args)) {
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262 PyErr_SetString(PyExc_TypeError,
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263 "optional 2nd arg must be a tuple");
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264 return NULL;
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265 }
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266 if (keyw != NULL && !PyDict_Check(keyw)) {
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267 PyErr_SetString(PyExc_TypeError,
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268 "optional 3rd arg must be a dictionary");
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269 return NULL;
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diff changeset
270 }
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271 boot = PyMem_NEW(struct bootstate, 1);
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272 if (boot == NULL)
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273 return PyErr_NoMemory();
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274 boot->interp = PyThreadState_Get()->interp;
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275 boot->func = func;
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276 boot->args = args;
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277 boot->keyw = keyw;
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278 Py_INCREF(func);
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279 Py_INCREF(args);
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280 Py_XINCREF(keyw);
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281 PyEval_InitThreads(); /* Start the interpreter's thread-awareness */
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282 if (!PyThread_start_new_thread(t_bootstrap, (void*) boot)) {
5405
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diff changeset
283 PyErr_SetString(ThreadError, "can't start new thread\n");
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284 Py_DECREF(func);
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285 Py_DECREF(args);
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diff changeset
286 Py_XDECREF(keyw);
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diff changeset
287 PyMem_DEL(boot);
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288 return NULL;
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diff changeset
289 }
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290 Py_INCREF(Py_None);
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diff changeset
291 return Py_None;
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292 }
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293
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294 static char start_new_doc[] =
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295 "start_new_thread(functon, args[, kwargs])\n\
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296 (start_new() is an obsolete synonym)\n\
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297 \n\
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298 Start a new thread. The thread will call the function with positional\n\
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299 arguments from the tuple args and keyword arguments taken from the optional\n\
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300 dictionary kwargs. The thread exits when the function returns; the return\n\
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301 value is ignored. The thread will also exit when the function raises an\n\
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302 unhandled exception; a stack trace will be printed unless the exception is\n\
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303 SystemExit.";
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304
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305 static PyObject *
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306 thread_PyThread_exit_thread(self, args)
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307 PyObject *self; /* Not used */
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308 PyObject *args;
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309 {
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310 if (!PyArg_NoArgs(args))
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311 return NULL;
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312 PyErr_SetNone(PyExc_SystemExit);
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313 return NULL;
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314 }
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315
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316 static char exit_doc[] =
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317 "exit()\n\
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318 (PyThread_exit_thread() is an obsolete synonym)\n\
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319 \n\
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320 This is synonymous to ``raise SystemExit''. It will cause the current\n\
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321 thread to exit silently unless the exception is caught.";
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322
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323 #ifndef NO_EXIT_PROG
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324 static PyObject *
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325 thread_PyThread_exit_prog(self, args)
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326 PyObject *self; /* Not used */
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327 PyObject *args;
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328 {
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329 int sts;
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330 if (!PyArg_Parse(args, "i", &sts))
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331 return NULL;
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332 Py_Exit(sts); /* Calls PyThread_exit_prog(sts) or _PyThread_exit_prog(sts) */
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333 for (;;) { } /* Should not be reached */
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334 }
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335 #endif
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336
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337 static PyObject *
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338 thread_PyThread_allocate_lock(self, args)
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339 PyObject *self; /* Not used */
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340 PyObject *args;
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341 {
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342 if (!PyArg_NoArgs(args))
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343 return NULL;
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344 return (PyObject *) newlockobject();
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345 }
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346
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347 static char allocate_doc[] =
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348 "allocate_lock() -> lock object\n\
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349 (allocate() is an obsolete synonym)\n\
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350 \n\
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351 Create a new lock object. See LockType.__doc__ for information about locks.";
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352
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353 static PyObject *
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354 thread_get_ident(self, args)
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355 PyObject *self; /* Not used */
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356 PyObject *args;
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357 {
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358 long ident;
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359 if (!PyArg_NoArgs(args))
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360 return NULL;
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361 ident = PyThread_get_thread_ident();
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362 if (ident == -1) {
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363 PyErr_SetString(ThreadError, "no current thread ident");
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364 return NULL;
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365 }
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366 return PyInt_FromLong(ident);
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367 }
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368
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369 static char get_ident_doc[] =
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370 "get_ident() -> integer\n\
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371 \n\
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372 Return a non-zero integer that uniquely identifies the current thread\n\
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373 amongst other threads that exist simultaneously.\n\
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374 This may be used to identify per-thread resources.\n\
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375 Even though on some platforms threads identities may appear to be\n\
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376 allocated consecutive numbers starting at 1, this behavior should not\n\
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377 be relied upon, and the number should be seen purely as a magic cookie.\n\
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378 A thread's identity may be reused for another thread after it exits.";
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379
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380 static PyMethodDef thread_methods[] = {
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381 {"start_new_thread", (PyCFunction)thread_PyThread_start_new_thread, 1,
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382 start_new_doc},
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383 {"start_new", (PyCFunction)thread_PyThread_start_new_thread, 1,
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384 start_new_doc},
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385 {"allocate_lock", (PyCFunction)thread_PyThread_allocate_lock, 0,
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386 allocate_doc},
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387 {"allocate", (PyCFunction)thread_PyThread_allocate_lock, 0,
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388 allocate_doc},
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389 {"exit_thread", (PyCFunction)thread_PyThread_exit_thread, 0,
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390 exit_doc},
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391 {"exit", (PyCFunction)thread_PyThread_exit_thread, 0,
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392 exit_doc},
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393 {"get_ident", (PyCFunction)thread_get_ident, 0,
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394 get_ident_doc},
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395 #ifndef NO_EXIT_PROG
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396 {"exit_prog", (PyCFunction)thread_PyThread_exit_prog},
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397 #endif
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398 {NULL, NULL} /* sentinel */
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399 };
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400
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401
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402 /* Initialization function */
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403
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404 static char thread_doc[] =
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405 "This module provides primitive operations to write multi-threaded programs.\n\
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406 The 'threading' module provides a more convenient interface.";
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407
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diff changeset
408 static char lock_doc[] =
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409 "A lock object is a synchronization primitive. To create a lock,\n\
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410 call the PyThread_allocate_lock() function. Methods are:\n\
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411 \n\
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412 acquire() -- lock the lock, possibly blocking until it can be obtained\n\
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413 release() -- unlock of the lock\n\
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414 locked() -- test whether the lock is currently locked\n\
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415 \n\
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416 A lock is not owned by the thread that locked it; another thread may\n\
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417 unlock it. A thread attempting to lock a lock that it has already locked\n\
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418 will block until another thread unlocks it. Deadlocks may ensue.";
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419
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420 DL_EXPORT(void)
923
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421 initthread()
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422 {
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423 PyObject *m, *d;
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424
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425 /* Create the module and add the functions */
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426 m = Py_InitModule3("thread", thread_methods, thread_doc);
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427
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428 /* Add a symbolic constant */
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429 d = PyModule_GetDict(m);
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430 ThreadError = PyErr_NewException("thread.error", NULL, NULL);
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431 PyDict_SetItemString(d, "error", ThreadError);
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432 Locktype.tp_doc = lock_doc;
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433 Py_INCREF(&Locktype);
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434 PyDict_SetItemString(d, "LockType", (PyObject *)&Locktype);
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435
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436 /* Initialize the C thread library */
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437 PyThread_init_thread();
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438 }