openbsd-ports/devel/hs-concurrent-extra/pkg/DESCR

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This package offers, among other things, the following selection of
synchronisation primitives:
Broadcast: Wake multiple threads by broadcasting a value.
Event: Wake multiple threads by signalling an event.
Lock: Enforce exclusive access to a resource. Also known as a binary
semaphore or mutex. The package additionally provides an alternative
that works in the STM monad.
RLock: A lock which can be acquired multiple times by the same
thread. Also known as a reentrant mutex.
ReadWriteLock: Multiple-reader, single-writer locks. Used to protect
shared resources which may be concurrently read, but only
sequentially written.
ReadWriteVar: Concurrent read, sequential write variables.
This package was inspired by the concurrency libraries of Java and
Python.