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7.6.1 Mutex Objects

mutex objects have following methods:

testandset (): ``Atomic'' test-and-set, grab the lock if it is not set, and return true, otherwise, return false.

lock (function, argument): Execute function(argument), unless the mutex is locked. In the case it is locked, place the function and argument on the queue. See unlock for explanation of when function(argument) is executed in that case.

unlock (): Unlock the mutex if queue is empty, otherwise execute the first element in the queue.