base-4.2.0.2: Basic libraries Source code Contents Index

Control.Concurrent.QSem Portability non-portable (concurrency) Stability experimental Maintainer libraries@haskell.org

Contents Simple Quantity Semaphores

Description

Simple quantity semaphores.

Synopsis

data QSem newQSem :: Int -> IO QSem waitQSem :: QSem -> IO () signalQSem :: QSem -> IO ()

Simple Quantity Semaphores

data QSem Source

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

newQSem :: Int -> IO QSem Source

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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