5386 Mutex mu1;  variable
5401   mu1.Lock();  in Worker()
5405   mu1.Unlock();  in Worker()
6692 Mutex mu1;  // This Mutex guards var.  variable
6697   MutexLock lock(&mu1);  // Correct Mutex.  in Thread1()
6989 Mutex mu1;  // Protects PTR.  variable
6995   MutexLock lock1(&mu1);  // Protect PTR.  in Writer1()
7001   MutexLock lock1(&mu1);  // Protect PTR.  in Writer2()
7048 Mutex mu1;  // Protects PTR.  variable
7054   MutexLock lock1(&mu1);  // Protect PTR.  in GoodWriter1()
7060   MutexLock lock1(&mu1);  // Protect PTR.  in GoodWriter2()
7065   MutexLock lock1(&mu1);  // Protect PTR.  in GoodReader()