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
42 using WebCore::Task;
43
44 namespace {
45
46 static const size_t bufferSize = 16;
47
48 static int lock = 0;
49
fillBuffer(volatile char * buffer,char fillPattern)50 static void fillBuffer(volatile char* buffer, char fillPattern)
51 {
52 for (size_t i = 0; i < bufferSize; ++i)
53 buffer[i] = fillPattern;
54 }
55
changeAndCheckBuffer(volatile char * buffer)56 static 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
threadMain(volatile char * buffer)70 static 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
TEST(WTF_SpinLock,Torture)79 TEST(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