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#include <gtest/gtest.h>
40
41namespace {
42
43using namespace blink;
44
45static const size_t bufferSize = 16;
46
47static int lock = 0;
48
49static void fillBuffer(volatile char* buffer, char fillPattern)
50{
51    for (size_t i = 0; i < bufferSize; ++i)
52        buffer[i] = fillPattern;
53}
54
55static void changeAndCheckBuffer(volatile char* buffer)
56{
57    fillBuffer(buffer, '\0');
58    int total = 0;
59    for (size_t i = 0; i < bufferSize; ++i)
60        total += buffer[i];
61
62    EXPECT_EQ(0, total);
63
64    // This will mess with the other thread's calculation if we accidentally get
65    // concurrency.
66    fillBuffer(buffer, '!');
67}
68
69static void threadMain(volatile char* buffer)
70{
71    for (int i = 0; i < 500000; ++i) {
72        spinLockLock(&lock);
73        changeAndCheckBuffer(buffer);
74        spinLockUnlock(&lock);
75    }
76}
77
78TEST(WTF_SpinLock, Torture)
79{
80    char sharedBuffer[bufferSize];
81
82    OwnPtr<WebThread> thread1 = adoptPtr(Platform::current()->createThread("thread1"));
83    OwnPtr<WebThread> thread2 = adoptPtr(Platform::current()->createThread("thread2"));
84
85    thread1->postTask(new Task(WTF::bind(&threadMain, static_cast<char*>(sharedBuffer))));
86    thread2->postTask(new Task(WTF::bind(&threadMain, static_cast<char*>(sharedBuffer))));
87
88    thread1.clear();
89    thread2.clear();
90}
91
92} // namespace
93