154 lines
5.1 KiB
C++
154 lines
5.1 KiB
C++
/*
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* Copyright (C) 2005-2017 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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* (C) 2012 Patrick Ganstere <paroga@paroga.com>
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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 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 <JavaScriptCore/JavaScriptCore.h>
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#include <stdlib.h>
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#include <wtf/Assertions.h>
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#include <wtf/HashSet.h>
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#include <wtf/Lock.h>
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#include <wtf/NeverDestroyed.h>
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#include <wtf/Threading.h>
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#include <wtf/ThreadingPrimitives.h>
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#include <wtf/Vector.h>
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static const size_t javaScriptThreadsCount = 4;
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static bool javaScriptThreadsShouldTerminate;
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static JSContextGroupRef javaScriptThreadsGroup;
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static Lock javaScriptThreadsLock;
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typedef HashSet<RefPtr<Thread>> ThreadSet;
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static ThreadSet& javaScriptThreads()
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{
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static NeverDestroyed<ThreadSet> staticJavaScriptThreads;
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ASSERT(!javaScriptThreadsLock.tryLock());
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return staticJavaScriptThreads;
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}
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// This function exercises JSC in a loop until javaScriptThreadsShouldTerminate
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// becomes true or it probabilistically decides to spawn a replacement thread and exit.
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void runJavaScriptThread()
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{
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static const char* const script =
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"var array = [];"
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"for (var i = 0; i < 1024; i++) {"
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" array.push(String(i));"
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"}";
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JSGlobalContextRef ctx;
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{
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Locker locker { javaScriptThreadsLock };
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ctx = JSGlobalContextCreateInGroup(javaScriptThreadsGroup, 0);
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}
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JSStringRef scriptRef;
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{
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Locker locker { javaScriptThreadsLock };
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scriptRef = JSStringCreateWithUTF8CString(script);
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}
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while (true) {
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{
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Locker locker { javaScriptThreadsLock };
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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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}
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{
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Locker locker { javaScriptThreadsLock };
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const size_t valuesCount = 1024;
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JSValueRef values[valuesCount];
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for (size_t i = 0; i < valuesCount; ++i)
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values[i] = JSObjectMake(ctx, 0, 0);
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}
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{
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Locker locker { javaScriptThreadsLock };
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if (javaScriptThreadsShouldTerminate)
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break;
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}
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// Respawn probabilistically.
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if (rand() % 5)
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continue;
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Locker locker { javaScriptThreadsLock };
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Thread& thread = Thread::current();
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thread.detach();
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javaScriptThreads().remove(&thread);
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javaScriptThreads().add(Thread::create("JavaScript Thread", &runJavaScriptThread));
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break;
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}
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Locker locker { javaScriptThreadsLock };
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JSStringRelease(scriptRef);
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JSGarbageCollect(ctx);
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JSGlobalContextRelease(ctx);
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}
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void startJavaScriptThreads()
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{
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javaScriptThreadsGroup = JSContextGroupCreate();
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Locker locker { javaScriptThreadsLock };
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for (size_t i = 0; i < javaScriptThreadsCount; ++i)
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javaScriptThreads().add(Thread::create("JavaScript Thread", &runJavaScriptThread));
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}
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void stopJavaScriptThreads()
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{
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{
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Locker locker { javaScriptThreadsLock };
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javaScriptThreadsShouldTerminate = true;
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}
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Vector<RefPtr<Thread>, javaScriptThreadsCount> threads;
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{
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Locker locker { javaScriptThreadsLock };
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threads = copyToVector(javaScriptThreads());
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ASSERT(threads.size() == javaScriptThreadsCount);
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}
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for (size_t i = 0; i < javaScriptThreadsCount; ++i)
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threads[i]->waitForCompletion();
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{
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Locker locker { javaScriptThreadsLock };
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javaScriptThreads().clear();
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}
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JSContextGroupRelease(javaScriptThreadsGroup);
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}
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