base-4.2.0.1: Basic libraries Source code Contents Index

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

Contents General Quantity Semaphores

Description

Quantity semaphores in which each thread may wait for an arbitrary "amount".

Synopsis

data QSemN newQSemN :: Int -> IO QSemN waitQSemN :: QSemN -> Int -> IO () signalQSemN :: QSemN -> Int -> IO ()

General Quantity Semaphores

data QSemN Source

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

newQSemN :: Int -> IO QSemN Source

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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