uni-reactor-22.214.171.124: Reactors for the uniform workbench
This is a much simpler reimplementation of Einar's old Mutex semaphores.
This is a lock which can be required by a thread which is already holding
See also TSem.
data MSem Source
newMSem :: IO MSemSource
synchronizeWithChoice :: MSem -> (Bool -> IO a) -> IO aSource
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