Control.Concurrent.QSem

Simple quantity semaphores.

Simple Quantity Semaphores

data QSem

QSem is a quantity semaphore in which the resource is aqcuired and released in units of one. It provides guaranteed FIFO ordering for satisfying blocked waitQSem calls.

The pattern

  bracket_ waitQSem signalQSem (...)

is safe; it never loses a unit of the resource.

newQSem :: Int -> IO QSem

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

waitQSem :: QSem -> IO ()

Wait for a unit to become available

signalQSem :: QSem -> IO ()

Signal that a unit of the QSem is available