RosettaCodeData/Task/Mutex/J/mutex.j

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name=. 10 T. 0 NB. create an exclusive mutex
name=. 10 T. 1 NB. create a shared (aka "recursive" or "reentrant") mutex
failed=. 11 T. mutex NB. take an exclusive lock on a mutex (waiting forever if necessary)
failed=. 11 T. mutex;seconds NB. try to take an exclusive lock on a mutex but may time out
NB. failed is 0 if lock was taken, 1 if lock was not taken
13 T. mutex NB. release lock on mutex