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

Control.Concurrent.QSemN

data QSemN Source

A QSemN is a quantity semaphore, in which the available "quantity" may be signalled or waited for in arbitrary amounts.

Instances

newQSemN :: Int -> IO QSemNSource

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

waitQSemN :: QSemN -> Int -> IO ()Source

Wait for the specified quantity to become available

signalQSemN :: QSemN -> Int -> IO ()Source

Signal that a given quantity is now available from the QSemN.

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