/*
* Copyright (C) 2013 Google Inc. All rights reserved.
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* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
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* * 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
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*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "config.h"
#include "wtf/SpinLock.h"
#include "platform/Task.h"
#include "public/platform/Platform.h"
#include "public/platform/WebThread.h"
#include "wtf/OwnPtr.h"
#include "wtf/PassOwnPtr.h"
#include <gtest/gtest.h>
using WebCore::Task;
namespace {
static const size_t bufferSize = 16;
static int lock = 0;
static void fillBuffer(volatile char* buffer, char fillPattern)
{
for (size_t i = 0; i < bufferSize; ++i)
buffer[i] = fillPattern;
}
static void changeAndCheckBuffer(volatile char* buffer)
{
fillBuffer(buffer, '\0');
int total = 0;
for (size_t i = 0; i < bufferSize; ++i)
total += buffer[i];
EXPECT_EQ(0, total);
// This will mess with the other thread's calculation if we accidentally get
// concurrency.
fillBuffer(buffer, '!');
}
static void threadMain(volatile char* buffer)
{
for (int i = 0; i < 500000; ++i) {
spinLockLock(&lock);
changeAndCheckBuffer(buffer);
spinLockUnlock(&lock);
}
}
TEST(WTF_SpinLock, Torture)
{
char sharedBuffer[bufferSize];
OwnPtr<blink::WebThread> thread1 = adoptPtr(blink::Platform::current()->createThread("thread1"));
OwnPtr<blink::WebThread> thread2 = adoptPtr(blink::Platform::current()->createThread("thread2"));
thread1->postTask(new Task(WTF::bind(&threadMain, static_cast<char*>(sharedBuffer))));
thread2->postTask(new Task(WTF::bind(&threadMain, static_cast<char*>(sharedBuffer))));
thread1.clear();
thread2.clear();
}
} // namespace