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 41 namespace { 42 43 using namespace blink; 44 45 static const size_t bufferSize = 16; 46 47 static int lock = 0; 48 49 static void fillBuffer(volatile char* buffer, char fillPattern) 50 { 51 for (size_t i = 0; i < bufferSize; ++i) 52 buffer[i] = fillPattern; 53 } 54 55 static 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 69 static 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 78 TEST(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