blob: 5f98929c31bc336ee068647e6f1534464740fe34 [file] [log] [blame]
/*
* Copyright (C) 2005-2017 Apple Inc. All rights reserved.
* (C) 2007 Graham Dennis (graham.dennis@gmail.com)
* (C) 2007 Eric Seidel <eric@webkit.org>
* (C) 2012 Patrick Ganstere <paroga@paroga.com>
*
* 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 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 <JavaScriptCore/JavaScriptCore.h>
#include <stdlib.h>
#include <wtf/Assertions.h>
#include <wtf/HashSet.h>
#include <wtf/Lock.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/Threading.h>
#include <wtf/ThreadingPrimitives.h>
#include <wtf/Vector.h>
static const size_t javaScriptThreadsCount = 4;
static bool javaScriptThreadsShouldTerminate;
static JSContextGroupRef javaScriptThreadsGroup;
static Lock javaScriptThreadsLock;
typedef HashSet<RefPtr<Thread>> ThreadSet;
static ThreadSet& javaScriptThreads()
{
static NeverDestroyed<ThreadSet> staticJavaScriptThreads;
ASSERT(!javaScriptThreadsLock.tryLock());
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()
{
static const char* const script =
"var array = [];"
"for (var i = 0; i < 1024; i++) {"
" array.push(String(i));"
"}";
JSGlobalContextRef ctx;
{
auto locker = holdLock(javaScriptThreadsLock);
ctx = JSGlobalContextCreateInGroup(javaScriptThreadsGroup, 0);
}
JSStringRef scriptRef;
{
auto locker = holdLock(javaScriptThreadsLock);
scriptRef = JSStringCreateWithUTF8CString(script);
}
while (true) {
{
auto locker = holdLock(javaScriptThreadsLock);
JSValueRef exception = 0;
JSEvaluateScript(ctx, scriptRef, 0, 0, 1, &exception);
ASSERT(!exception);
}
{
auto locker = holdLock(javaScriptThreadsLock);
const size_t valuesCount = 1024;
JSValueRef values[valuesCount];
for (size_t i = 0; i < valuesCount; ++i)
values[i] = JSObjectMake(ctx, 0, 0);
}
{
auto locker = holdLock(javaScriptThreadsLock);
if (javaScriptThreadsShouldTerminate)
break;
}
// Respawn probabilistically.
if (rand() % 5)
continue;
auto locker = holdLock(javaScriptThreadsLock);
Thread& thread = Thread::current();
thread.detach();
javaScriptThreads().remove(&thread);
javaScriptThreads().add(Thread::create("JavaScript Thread", &runJavaScriptThread));
break;
}
auto locker = holdLock(javaScriptThreadsLock);
JSStringRelease(scriptRef);
JSGarbageCollect(ctx);
JSGlobalContextRelease(ctx);
}
void startJavaScriptThreads()
{
javaScriptThreadsGroup = JSContextGroupCreate();
auto locker = holdLock(javaScriptThreadsLock);
for (size_t i = 0; i < javaScriptThreadsCount; ++i)
javaScriptThreads().add(Thread::create("JavaScript Thread", &runJavaScriptThread));
}
void stopJavaScriptThreads()
{
{
auto locker = holdLock(javaScriptThreadsLock);
javaScriptThreadsShouldTerminate = true;
}
Vector<RefPtr<Thread>, javaScriptThreadsCount> threads;
{
auto locker = holdLock(javaScriptThreadsLock);
threads = copyToVector(javaScriptThreads());
ASSERT(threads.size() == javaScriptThreadsCount);
}
for (size_t i = 0; i < javaScriptThreadsCount; ++i)
threads[i]->waitForCompletion();
{
auto locker = holdLock(javaScriptThreadsLock);
javaScriptThreads().clear();
}
JSContextGroupRelease(javaScriptThreadsGroup);
}