18   Mutex* mutex = OS::CreateMutex();  in TEST()  local
19   CHECK_EQ(0, mutex->Lock());  // acquire the lock with the right token  in TEST()
20   CHECK_EQ(0, mutex->Unlock());  // can unlock with the right token  in TEST()
21   delete mutex;  in TEST()
26   Mutex* mutex = OS::CreateMutex();  in TEST()  local
27   CHECK_EQ(0, mutex->Lock());  in TEST()
28   CHECK_EQ(0, mutex->Unlock());  in TEST()
29   delete mutex;  in TEST()
34   Mutex* mutex = OS::CreateMutex();  in TEST()  local
35   CHECK_EQ(0, mutex->Lock());  in TEST()
36   CHECK_EQ(0, mutex->Unlock());  in TEST()
37   CHECK_EQ(0, mutex->Lock());  in TEST()
38   CHECK_EQ(0, mutex->Unlock());  in TEST()
39   delete mutex;  in TEST()