47   MutexLock lock(&mu1);  // Correct Mutex.  in Thread1()
52   MutexLock lock(&mu2);  // Wrong Mutex.  in Thread2()
335   MutexLock lock3(&mu3);  // This lock is unrelated to PTR.  in Writer1()
336   MutexLock lock1(&mu1);  // Protect PTR.  in Writer1()
341   MutexLock lock2(&mu2);  // This lock is unrelated to PTR.  in Writer2()
342   MutexLock lock1(&mu1);  // Protect PTR.  in Writer2()
351   MutexLock lock2(&mu2);  // Oh, gosh, this is a wrong mutex!  in Reader()
393   MutexLock lock3(&mu3);  // This lock is unrelated to PTR.  in GoodWriter1()
394   MutexLock lock1(&mu1);  // Protect PTR.  in GoodWriter1()
399   MutexLock lock2(&mu2);  // This lock is unrelated to PTR.  in GoodWriter2()
400   MutexLock lock1(&mu1);  // Protect PTR.  in GoodWriter2()
405   MutexLock lock1(&mu1);  // Protect PTR.  in GoodReader()
410   MutexLock lock2(&mu2);  // Wrong mutex!  in BuggyWriter()
517     MutexLock lock(&mu_);  in Done()
522       MutexLock lock(&mu_);  in ~A()