Simplify implementation of Mutex.

test/cctest/test-lock.cc

-// Copyright 2006-2008 the V8 project authors. All rights reserved.
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-// modification, are permitted provided that the following conditions are
-// met:
-//
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-//       contributors may be used to endorse or promote products derived
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-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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-//
-// Tests of the TokenLock class from lock.h
-
-#include <stdlib.h>
-
-#include "v8.h"
-
-#include "platform.h"
-#include "cctest.h"
-
-
-using namespace ::v8::internal;
-
-
-// Simple test of locking logic
-TEST(Simple) {
-  Mutex* mutex = OS::CreateMutex();
-  CHECK_EQ(0, mutex->Lock());  // acquire the lock with the right token
-  CHECK_EQ(0, mutex->Unlock());  // can unlock with the right token
-  delete mutex;
-}
-
-
-TEST(MultiLock) {
-  Mutex* mutex = OS::CreateMutex();
-  CHECK_EQ(0, mutex->Lock());
-  CHECK_EQ(0, mutex->Unlock());
-  delete mutex;
-}
-
-
-TEST(ShallowLock) {
-  Mutex* mutex = OS::CreateMutex();
-  CHECK_EQ(0, mutex->Lock());
-  CHECK_EQ(0, mutex->Unlock());
-  CHECK_EQ(0, mutex->Lock());
-  CHECK_EQ(0, mutex->Unlock());
-  delete mutex;
-}
-
-
-TEST(SemaphoreTimeout) {
-  bool ok;
-  Semaphore* sem = OS::CreateSemaphore(0);
-
-  // Semaphore not signalled - timeout.
-  ok = sem->Wait(0);
-  CHECK(!ok);
-  ok = sem->Wait(100);
-  CHECK(!ok);
-  ok = sem->Wait(1000);
-  CHECK(!ok);
-
-  // Semaphore signalled - no timeout.
-  sem->Signal();
-  ok = sem->Wait(0);
-  sem->Signal();
-  ok = sem->Wait(100);
-  sem->Signal();
-  ok = sem->Wait(1000);
-  CHECK(ok);
-  delete sem;
-}