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/*
* Copyright (C) 2005, 2006, 2007 Apple Inc. All rights reserved.
* (C) 2007 Graham Dennis (graham.dennis@gmail.com)
* (C) 2007 Eric Seidel <eric@webkit.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "JavaScriptThreading.h"
#include <CoreFoundation/CoreFoundation.h>
#include <JavaScriptCore/JavaScriptCore.h>
#include <pthread.h>
#include <wtf/Assertions.h>
#include <wtf/HashSet.h>
static JSContextGroupRef javaScriptThreadsGroup;
static pthread_mutex_t javaScriptThreadsMutex = PTHREAD_MUTEX_INITIALIZER;
static bool javaScriptThreadsShouldTerminate;
static const int javaScriptThreadsCount = 4;
typedef HashSet<pthread_t> ThreadSet;
static ThreadSet* javaScriptThreads()
{
ASSERT(pthread_mutex_trylock(&javaScriptThreadsMutex) == EBUSY);
static ThreadSet staticJavaScriptThreads;
return &staticJavaScriptThreads;
}
// This function exercises JSC in a loop until javaScriptThreadsShouldTerminate
// becomes true or it probabilistically decides to spawn a replacement thread and exit.
void* runJavaScriptThread(void* arg)
{
static const char* const script =
"var array = [];"
"for (var i = 0; i < 1024; i++) {"
" array.push(String(i));"
"}";
pthread_mutex_lock(&javaScriptThreadsMutex);
JSGlobalContextRef ctx = JSGlobalContextCreateInGroup(javaScriptThreadsGroup, 0);
pthread_mutex_unlock(&javaScriptThreadsMutex);
pthread_mutex_lock(&javaScriptThreadsMutex);
JSStringRef scriptRef = JSStringCreateWithUTF8CString(script);
pthread_mutex_unlock(&javaScriptThreadsMutex);
while (1) {
pthread_mutex_lock(&javaScriptThreadsMutex);
JSValueRef exception = 0;
JSEvaluateScript(ctx, scriptRef, 0, 0, 1, &exception);
ASSERT(!exception);
pthread_mutex_unlock(&javaScriptThreadsMutex);
pthread_mutex_lock(&javaScriptThreadsMutex);
size_t valuesCount = 1024;
JSValueRef values[valuesCount];
for (size_t i = 0; i < valuesCount; ++i)
values[i] = JSObjectMake(ctx, 0, 0);
pthread_mutex_unlock(&javaScriptThreadsMutex);
// Check for cancellation.
if (javaScriptThreadsShouldTerminate)
goto done;
// Respawn probabilistically.
if (random() % 5 == 0) {
pthread_mutex_lock(&javaScriptThreadsMutex);
pthread_t pthread;
pthread_create(&pthread, 0, &runJavaScriptThread, 0);
pthread_detach(pthread);
javaScriptThreads()->add(pthread);
pthread_mutex_unlock(&javaScriptThreadsMutex);
goto done;
}
}
done:
pthread_mutex_lock(&javaScriptThreadsMutex);
JSStringRelease(scriptRef);
JSGarbageCollect(ctx);
JSGlobalContextRelease(ctx);
javaScriptThreads()->remove(pthread_self());
pthread_mutex_unlock(&javaScriptThreadsMutex);
return 0;
}
void startJavaScriptThreads()
{
javaScriptThreadsGroup = JSContextGroupCreate();
pthread_mutex_lock(&javaScriptThreadsMutex);
for (int i = 0; i < javaScriptThreadsCount; i++) {
pthread_t pthread;
pthread_create(&pthread, 0, &runJavaScriptThread, 0);
pthread_detach(pthread);
javaScriptThreads()->add(pthread);
}
pthread_mutex_unlock(&javaScriptThreadsMutex);
}
void stopJavaScriptThreads()
{
pthread_mutex_lock(&javaScriptThreadsMutex);
javaScriptThreadsShouldTerminate = true;
pthread_mutex_unlock(&javaScriptThreadsMutex);
while (true) {
pthread_mutex_lock(&javaScriptThreadsMutex);
int threadCount = javaScriptThreads()->size();
pthread_mutex_unlock(&javaScriptThreadsMutex);
if (!threadCount)
break;
usleep(1000);
}
}
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