third_party/WebKit/Source/web/tests/SpinLockTest.cpp

   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
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   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
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  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,
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  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 "platform/ThreadSafeFunctional.h"
  36 #include "public/platform/Platform.h"
  37 #include "public/platform/WebThread.h"
  38 #include "public/platform/WebTraceLocation.h"
  39 #include "wtf/OwnPtr.h"
  40 #include "wtf/PassOwnPtr.h"
  41 #include <gtest/gtest.h>
  42
  43 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(SpinLockTest, 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->taskRunner()->postTask(FROM_HERE, new Task(threadSafeBind(&threadMain, AllowCrossThreadAccess(static_cast<char*>(sharedBuffer)))));
  86     thread2->taskRunner()->postTask(FROM_HERE, new Task(threadSafeBind(&threadMain, AllowCrossThreadAccess(static_cast<char*>(sharedBuffer)))));
  87
  88     thread1.clear();
  89     thread2.clear();
  90 }
  91
  92 } // namespace blink