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      1 /*
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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 "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 
     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 
     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 
     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 
     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