qsem-0.1.0.0: quantity semaphores
QSemN
Contents
Description
Quantity semaphores in which each thread may wait for an arbitrary "amount".
data QSemN Source #
QSemN is a quantity semaphore in which the resource is acquired and released in units of one. It provides guaranteed FIFO ordering for satisfying blocked waitQSemN calls.
waitQSemN
The pattern
bracket_ (waitQSemN n) (signalQSemN n) (...)
is safe; it never loses any of the resource.
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.