/** Release one level of mutator locks if this thread holds at lease one. */
public void releaseMutatorLock() {
Long lockStateVal = lockState.get();
if (lockStateVal == null) lockStateVal = zero;
final long longVal = lockStateVal;
if (longVal == 0)
// No lock to release, return
return;
if (longVal == 1) {
// Last one on stack release lock
// Using read lock because we want a non-exclusive lock
mutatorLock.readUnlock();
lockStateVal = zero;
} else {
lockStateVal = longVal - 1;
}
lockState.set(lockStateVal);
}
