author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 17 Sep 2010 09:07:27 +0300 | |
branch | RCL_3 |
changeset 1 | 9d347b658349 |
parent 0 | 4f2f89ce4247 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (C) 2005, 2006, 2007 Apple Inc. All rights reserved. |
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* (C) 2007 Graham Dennis (graham.dennis@gmail.com) |
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* (C) 2007 Eric Seidel <eric@webkit.org> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
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* its contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "config.h" |
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#include "JavaScriptThreading.h" |
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#include <CoreFoundation/CoreFoundation.h> |
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#include <JavaScriptCore/JavaScriptCore.h> |
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#include <pthread.h> |
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#include <wtf/Assertions.h> |
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#include <wtf/HashSet.h> |
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static pthread_mutex_t javaScriptThreadsMutex = PTHREAD_MUTEX_INITIALIZER; |
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static bool javaScriptThreadsShouldTerminate; |
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static const int javaScriptThreadsCount = 4; |
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typedef HashSet<pthread_t> ThreadSet; |
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static ThreadSet* javaScriptThreads() |
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{ |
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ASSERT(pthread_mutex_trylock(&javaScriptThreadsMutex) == EBUSY); |
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static ThreadSet staticJavaScriptThreads; |
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return &staticJavaScriptThreads; |
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} |
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// Loops forever, running a script and randomly respawning, until |
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// javaScriptThreadsShouldTerminate becomes true. |
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void* runJavaScriptThread(void* arg) |
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{ |
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const char* const script = |
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"var array = [];" |
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"for (var i = 0; i < 10; i++) {" |
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" array.push(String(i));" |
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"}"; |
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while (1) { |
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JSGlobalContextRef ctx = JSGlobalContextCreate(0); |
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JSStringRef scriptRef = JSStringCreateWithUTF8CString(script); |
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JSValueRef exception = 0; |
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JSEvaluateScript(ctx, scriptRef, 0, 0, 1, &exception); |
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ASSERT(!exception); |
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JSGarbageCollect(ctx); |
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JSGlobalContextRelease(ctx); |
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JSStringRelease(scriptRef); |
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JSGarbageCollect(0); |
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pthread_mutex_lock(&javaScriptThreadsMutex); |
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// Check for cancellation. |
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if (javaScriptThreadsShouldTerminate) { |
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javaScriptThreads()->remove(pthread_self()); |
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pthread_mutex_unlock(&javaScriptThreadsMutex); |
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return 0; |
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} |
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// Respawn probabilistically. |
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if (random() % 5 == 0) { |
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pthread_t pthread; |
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pthread_create(&pthread, 0, &runJavaScriptThread, 0); |
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pthread_detach(pthread); |
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javaScriptThreads()->remove(pthread_self()); |
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javaScriptThreads()->add(pthread); |
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pthread_mutex_unlock(&javaScriptThreadsMutex); |
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return 0; |
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} |
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pthread_mutex_unlock(&javaScriptThreadsMutex); |
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} |
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} |
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void startJavaScriptThreads() |
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{ |
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pthread_mutex_lock(&javaScriptThreadsMutex); |
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for (int i = 0; i < javaScriptThreadsCount; i++) { |
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pthread_t pthread; |
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pthread_create(&pthread, 0, &runJavaScriptThread, 0); |
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pthread_detach(pthread); |
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javaScriptThreads()->add(pthread); |
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} |
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pthread_mutex_unlock(&javaScriptThreadsMutex); |
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} |
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|
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void stopJavaScriptThreads() |
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{ |
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pthread_mutex_lock(&javaScriptThreadsMutex); |
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|
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javaScriptThreadsShouldTerminate = true; |
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|
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ASSERT(javaScriptThreads()->size() == javaScriptThreadsCount); |
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|
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pthread_mutex_unlock(&javaScriptThreadsMutex); |
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|
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while (true) { |
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pthread_mutex_lock(&javaScriptThreadsMutex); |
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int threadCount = javaScriptThreads()->size(); |
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pthread_mutex_unlock(&javaScriptThreadsMutex); |
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|
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if (!threadCount) |
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break; |
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usleep(1000); |
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} |
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} |