blob: 769d34999f30d46f9092eb8bbda8d6452dc39613 [file] [log] [blame]
/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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 "wtf/SpinLock.h"
#include "platform/ThreadSafeFunctional.h"
#include "public/platform/Platform.h"
#include "public/platform/WebTaskRunner.h"
#include "public/platform/WebThread.h"
#include "public/platform/WebTraceLocation.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "wtf/PtrUtil.h"
#include <memory>
namespace blink {
static const size_t bufferSize = 16;
static SpinLock lock;
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) {
SpinLock::Guard guard(lock);
changeAndCheckBuffer(buffer);
}
}
TEST(SpinLockTest, Torture)
{
char sharedBuffer[bufferSize];
std::unique_ptr<WebThread> thread1 = wrapUnique(Platform::current()->createThread("thread1"));
std::unique_ptr<WebThread> thread2 = wrapUnique(Platform::current()->createThread("thread2"));
thread1->getWebTaskRunner()->postTask(BLINK_FROM_HERE, threadSafeBind(&threadMain, AllowCrossThreadAccess(static_cast<char*>(sharedBuffer))));
thread2->getWebTaskRunner()->postTask(BLINK_FROM_HERE, threadSafeBind(&threadMain, AllowCrossThreadAccess(static_cast<char*>(sharedBuffer))));
thread1.reset();
thread2.reset();
}
} // namespace blink