author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 31 Aug 2010 16:57:14 +0300 | |
branch | RCL_3 |
changeset 23 | 26645d81f48d |
parent 0 | 08ec8eefde2f |
permissions | -rw-r--r-- |
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/* |
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* tclThreadJoin.c -- |
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* |
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* This file implements a platform independent emulation layer for |
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* the handling of joinable threads. The Mac and Windows platforms |
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* use this code to provide the functionality of joining threads. |
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* This code is currently not necessary on Unix. |
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* |
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* Copyright (c) 2000 by Scriptics Corporation |
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* |
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* See the file "license.terms" for information on usage and redistribution |
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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* |
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* RCS: @(#) $Id: tclThreadJoin.c,v 1.4 2002/04/24 20:35:40 hobbs Exp $ |
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*/ |
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#include "tclInt.h" |
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#if defined(WIN32) || defined(MAC_TCL) |
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/* The information about each joinable thread is remembered in a |
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* structure as defined below. |
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*/ |
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typedef struct JoinableThread { |
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Tcl_ThreadId id; /* The id of the joinable thread */ |
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int result; /* A place for the result after the |
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* demise of the thread */ |
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int done; /* Boolean flag. Initialized to 0 |
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* and set to 1 after the exit of |
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* the thread. This allows a thread |
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* requesting a join to detect when |
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* waiting is not necessary. */ |
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int waitedUpon; /* Boolean flag. Initialized to 0 |
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* and set to 1 by the thread waiting |
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* for this one via Tcl_JoinThread. |
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* Used to lock any other thread |
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* trying to wait on this one. |
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*/ |
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Tcl_Mutex threadMutex; /* The mutex used to serialize access |
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* to this structure. */ |
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Tcl_Condition cond; /* This is the condition a thread has |
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* to wait upon to get notified of the |
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* end of the described thread. It is |
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* signaled indirectly by |
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* Tcl_ExitThread. */ |
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struct JoinableThread* nextThreadPtr; /* Reference to the next thread in the |
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* list of joinable threads */ |
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} JoinableThread; |
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/* The following variable is used to maintain the global list of all |
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* joinable threads. Usage by a thread is allowed only if the |
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* thread acquired the 'joinMutex'. |
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*/ |
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TCL_DECLARE_MUTEX(joinMutex) |
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static JoinableThread* firstThreadPtr; |
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/* |
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*---------------------------------------------------------------------- |
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* |
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* TclJoinThread -- |
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* |
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* This procedure waits for the exit of the thread with the specified |
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* id and returns its result. |
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* |
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* Results: |
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* A standard tcl result signaling the overall success/failure of the |
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* operation and an integer result delivered by the thread which was |
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* waited upon. |
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* |
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* Side effects: |
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* Deallocates the memory allocated by TclRememberJoinableThread. |
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* Removes the data associated to the thread waited upon from the |
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* list of joinable threads. |
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* |
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*---------------------------------------------------------------------- |
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*/ |
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int |
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TclJoinThread(id, result) |
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Tcl_ThreadId id; /* The id of the thread to wait upon. */ |
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int* result; /* Reference to a location for the result |
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* of the thread we are waiting upon. */ |
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{ |
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/* Steps done here: |
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* i. Acquire the joinMutex and search for the thread. |
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* ii. Error out if it could not be found. |
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* iii. If found, switch from exclusive access to the list to exclusive |
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* access to the thread structure. |
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* iv. Error out if some other is already waiting. |
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* v. Skip the waiting part of the thread is already done. |
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* vi. Wait for the thread to exit, mark it as waited upon too. |
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* vii. Get the result form the structure, |
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* viii. switch to exclusive access of the list, |
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* ix. remove the structure from the list, |
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* x. then switch back to exclusive access to the structure |
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* xi. and delete it. |
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*/ |
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103 |
|
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104 |
JoinableThread* threadPtr; |
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|
105 |
|
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|
106 |
Tcl_MutexLock (&joinMutex); |
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|
107 |
|
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|
108 |
for (threadPtr = firstThreadPtr; |
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|
109 |
(threadPtr != (JoinableThread*) NULL) && (threadPtr->id != id); |
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|
110 |
threadPtr = threadPtr->nextThreadPtr) |
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|
111 |
/* empty body */ |
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112 |
; |
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|
113 |
|
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|
114 |
if (threadPtr == (JoinableThread*) NULL) { |
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|
115 |
/* Thread not found. Either not joinable, or already waited |
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116 |
* upon and exited. Whatever, an error is in order. |
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117 |
*/ |
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118 |
|
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119 |
Tcl_MutexUnlock (&joinMutex); |
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120 |
return TCL_ERROR; |
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121 |
} |
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122 |
|
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123 |
/* [1] If we don't lock the structure before giving up exclusive access |
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124 |
* to the list some other thread just completing its wait on the same |
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125 |
* thread can delete the structure from under us, leaving us with a |
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126 |
* dangling pointer. |
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127 |
*/ |
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128 |
|
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129 |
Tcl_MutexLock (&threadPtr->threadMutex); |
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130 |
Tcl_MutexUnlock (&joinMutex); |
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131 |
|
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132 |
/* [2] Now that we have the structure mutex any other thread that just |
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133 |
* tries to delete structure will wait at location [3] until we are |
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134 |
* done with the structure. And in that case we are done with it |
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135 |
* rather quickly as 'waitedUpon' will be set and we will have to |
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|
136 |
* error out. |
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137 |
*/ |
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|
138 |
|
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139 |
if (threadPtr->waitedUpon) { |
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140 |
Tcl_MutexUnlock (&threadPtr->threadMutex); |
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141 |
return TCL_ERROR; |
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142 |
} |
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|
143 |
|
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144 |
/* We are waiting now, let other threads recognize this |
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145 |
*/ |
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|
146 |
|
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147 |
threadPtr->waitedUpon = 1; |
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148 |
|
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149 |
while (!threadPtr->done) { |
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150 |
Tcl_ConditionWait (&threadPtr->cond, &threadPtr->threadMutex, NULL); |
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151 |
} |
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|
152 |
|
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153 |
/* We have to release the structure before trying to access the list |
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154 |
* again or we can run into deadlock with a thread at [1] (see above) |
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155 |
* because of us holding the structure and the other holding the list. |
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156 |
* There is no problem with dangling pointers here as 'waitedUpon == 1' |
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157 |
* is still valid and any other thread will error out and not come to |
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|
158 |
* this place. IOW, the fact that we are here also means that no other |
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|
159 |
* thread came here before us and is able to delete the structure. |
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|
160 |
*/ |
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|
161 |
|
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|
162 |
Tcl_MutexUnlock (&threadPtr->threadMutex); |
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|
163 |
Tcl_MutexLock (&joinMutex); |
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|
164 |
|
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|
165 |
/* We have to search the list again as its structure may (may, almost |
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|
166 |
* certainly) have changed while we were waiting. Especially now is the |
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|
167 |
* time to compute the predecessor in the list. Any earlier result can |
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|
168 |
* be dangling by now. |
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|
169 |
*/ |
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|
170 |
|
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|
171 |
if (firstThreadPtr == threadPtr) { |
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|
172 |
firstThreadPtr = threadPtr->nextThreadPtr; |
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|
173 |
} else { |
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|
174 |
JoinableThread* prevThreadPtr; |
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|
175 |
|
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|
176 |
for (prevThreadPtr = firstThreadPtr; |
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|
177 |
prevThreadPtr->nextThreadPtr != threadPtr; |
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|
178 |
prevThreadPtr = prevThreadPtr->nextThreadPtr) |
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|
179 |
/* empty body */ |
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|
180 |
; |
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|
181 |
|
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|
182 |
prevThreadPtr->nextThreadPtr = threadPtr->nextThreadPtr; |
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|
183 |
} |
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|
184 |
|
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|
185 |
Tcl_MutexUnlock (&joinMutex); |
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|
186 |
|
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|
187 |
/* [3] Now that the structure is not part of the list anymore no other |
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|
188 |
* thread can acquire its mutex from now on. But it is possible that |
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|
189 |
* another thread is still holding the mutex though, see location [2]. |
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|
190 |
* So we have to acquire the mutex one more time to wait for that thread |
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|
191 |
* to finish. We can (and have to) release the mutex immediately. |
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|
192 |
*/ |
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|
193 |
|
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|
194 |
Tcl_MutexLock (&threadPtr->threadMutex); |
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|
195 |
Tcl_MutexUnlock (&threadPtr->threadMutex); |
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|
196 |
|
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|
197 |
/* Copy the result to us, finalize the synchronisation objects, then |
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198 |
* free the structure and return. |
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|
199 |
*/ |
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|
200 |
|
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|
201 |
*result = threadPtr->result; |
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|
202 |
|
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|
203 |
Tcl_ConditionFinalize (&threadPtr->cond); |
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|
204 |
Tcl_MutexFinalize (&threadPtr->threadMutex); |
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|
205 |
ckfree ((VOID*) threadPtr); |
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|
206 |
|
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return TCL_OK; |
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} |
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|
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/* |
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*---------------------------------------------------------------------- |
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* |
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* TclRememberJoinableThread -- |
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* |
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* This procedure remebers a thread as joinable. Only a call to |
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* TclJoinThread will remove the structre created (and initialized) |
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* here. IOW, not waiting upon a joinable thread will cause memory |
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* leaks. |
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* |
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* Results: |
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* None. |
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* |
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* Side effects: |
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* Allocates memory, adds it to the global list of all joinable |
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* threads. |
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* |
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*---------------------------------------------------------------------- |
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*/ |
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229 |
|
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VOID |
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TclRememberJoinableThread(id) |
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Tcl_ThreadId id; /* The thread to remember as joinable */ |
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{ |
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JoinableThread* threadPtr; |
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235 |
|
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threadPtr = (JoinableThread*) ckalloc (sizeof (JoinableThread)); |
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threadPtr->id = id; |
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threadPtr->done = 0; |
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threadPtr->waitedUpon = 0; |
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threadPtr->threadMutex = (Tcl_Mutex) NULL; |
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threadPtr->cond = (Tcl_Condition) NULL; |
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|
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Tcl_MutexLock (&joinMutex); |
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244 |
|
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threadPtr->nextThreadPtr = firstThreadPtr; |
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firstThreadPtr = threadPtr; |
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|
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Tcl_MutexUnlock (&joinMutex); |
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} |
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250 |
|
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/* |
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*---------------------------------------------------------------------- |
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* |
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* TclSignalExitThread -- |
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* |
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* This procedure signals that the specified thread is done with |
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* its work. If the thread is joinable this signal is propagated |
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* to the thread waiting upon it. |
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* |
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* Results: |
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* None. |
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* |
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* Side effects: |
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* Modifies the associated structure to hold the result. |
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* |
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*---------------------------------------------------------------------- |
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*/ |
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|
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VOID |
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TclSignalExitThread(id,result) |
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Tcl_ThreadId id; /* Id of the thread signaling its exit */ |
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int result; /* The result from the thread */ |
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{ |
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JoinableThread* threadPtr; |
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|
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Tcl_MutexLock (&joinMutex); |
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|
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for (threadPtr = firstThreadPtr; |
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(threadPtr != (JoinableThread*) NULL) && (threadPtr->id != id); |
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threadPtr = threadPtr->nextThreadPtr) |
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/* empty body */ |
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; |
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283 |
|
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if (threadPtr == (JoinableThread*) NULL) { |
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/* Thread not found. Not joinable. No problem, nothing to do. |
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*/ |
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|
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Tcl_MutexUnlock (&joinMutex); |
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return; |
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} |
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291 |
|
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/* Switch over the exclusive access from the list to the structure, |
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* then store the result, set the flag and notify the waiting thread, |
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* provided that it exists. The order of lock/unlock ensures that a |
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* thread entering 'TclJoinThread' will not interfere with us. |
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*/ |
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297 |
|
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Tcl_MutexLock (&threadPtr->threadMutex); |
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Tcl_MutexUnlock (&joinMutex); |
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300 |
|
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threadPtr->done = 1; |
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threadPtr->result = result; |
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303 |
|
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if (threadPtr->waitedUpon) { |
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Tcl_ConditionNotify (&threadPtr->cond); |
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} |
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307 |
|
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Tcl_MutexUnlock (&threadPtr->threadMutex); |
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} |
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310 |
|
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311 |
#endif /* WIN32 || MAC_TCL */ |