1/*
2 * Copyright (C) 2013 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include "config.h"
32#include "wtf/SpinLock.h"
33
34#include "platform/Task.h"
35#include "public/platform/Platform.h"
36#include "public/platform/WebThread.h"
37#include "wtf/OwnPtr.h"
38#include "wtf/PassOwnPtr.h"
39
40#include <gtest/gtest.h>
41
42using WebCore::Task;
43
44namespace {
45
46static const size_t bufferSize = 16;
47
48static int lock = 0;
49
50static void fillBuffer(volatile char* buffer, char fillPattern)
51{
52    for (size_t i = 0; i < bufferSize; ++i)
53        buffer[i] = fillPattern;
54}
55
56static void changeAndCheckBuffer(volatile char* buffer)
57{
58    fillBuffer(buffer, '\0');
59    int total = 0;
60    for (size_t i = 0; i < bufferSize; ++i)
61        total += buffer[i];
62
63    EXPECT_EQ(0, total);
64
65    // This will mess with the other thread's calculation if we accidentally get
66    // concurrency.
67    fillBuffer(buffer, '!');
68}
69
70static void threadMain(volatile char* buffer)
71{
72    for (int i = 0; i < 500000; ++i) {
73        spinLockLock(&lock);
74        changeAndCheckBuffer(buffer);
75        spinLockUnlock(&lock);
76    }
77}
78
79TEST(WTF_SpinLock, Torture)
80{
81    char sharedBuffer[bufferSize];
82
83    OwnPtr<blink::WebThread> thread1 = adoptPtr(blink::Platform::current()->createThread("thread1"));
84    OwnPtr<blink::WebThread> thread2 = adoptPtr(blink::Platform::current()->createThread("thread2"));
85
86    thread1->postTask(new Task(WTF::bind(&threadMain, static_cast<char*>(sharedBuffer))));
87    thread2->postTask(new Task(WTF::bind(&threadMain, static_cast<char*>(sharedBuffer))));
88
89    thread1.clear();
90    thread2.clear();
91}
92
93} // namespace
94