Maintainer | Bas van Dijk <v.dijk.bas@gmail.com> , Roel van Dijk <vandijk.roel@gmail.com> |
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An Event is a simple mechanism for communication between threads: one thread signals an event and other threads wait for it.
Each event has an internal state which is either "Set" or "Cleared". This
state can be changed with the corresponding functions set
and clear
. The
wait
function blocks until the state is "Set". An important property of
setting an event is that all threads waiting for it are woken.
It was inspired by the Python Event
object. See:
http://docs.python.org/3.1/library/threading.html#event-objects
This module is designed to be imported qualified. We suggest importing it like:
import Control.Concurrent.STM.Event ( Event ) import qualified Control.Concurrent.STM.Event as Event ( ... )
Documentation
An event is in one of two possible states: "Set" or "Cleared".
Changes the state of the event to "Set". All threads that where waiting for
this event are woken. Threads that wait
after the state is changed to "Set"
will not retry.