If thread t1 locks mutex m, can thread t2 unlock it?

I ask because I get no sign of exceptions being thrown when 
I execute the following code in the toplevel:

let m = Mutex.create ()
let () = Mutex.lock m
let f m' = Mutex.unlock m'
let t = Thread.create f m
let () = Mutex.lock m

Also, the final call to Mutex.lock does not block the 
execution of the program by any significant time, which 
means that mutex m is unlocked by thread t before being 
locked once again by the original thread.

Is this a bug or a feature? Are threads supposed to be able 
to unlock mutexes held by _other_ threads?

Alex

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