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Showing content from http://hackage.haskell.org/packages/archive/base/4.5.0.0/doc/html/Control-Concurrent-QSem.html below:

Control.Concurrent.QSem

data QSem Source

A QSem is a simple quantity semaphore, in which the available "quantity" is always dealt with in units of one.

Instances

newQSem :: Int -> IO QSemSource

Build a new QSem with a supplied initial quantity. The initial quantity must be at least 0.

waitQSem :: QSem -> IO ()Source

Wait for a unit to become available

signalQSem :: QSem -> IO ()Source

Signal that a unit of the QSem is available

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