2010/2/22 Roel van Dijk
Hello,
We would like to announce an update of concurrent-extra [1].
Bug fixes: - A bug in RLock.acquire (thanks to Felipe Lessa).
New features:
- Broadcast: Wake multiple threads by broadcasting a value. This is a generalisation of Event. - Thread: Threads extended with the ability to wait for their termination. - delay: Arbitrarily long thread delays. - timeout: Wait arbitrarily long for an IO computation to finish.
The lightweight thread wrapper was inspired by the threadmanager package [2]. The main advantage of our implementation is that we don't maintain an internal mapping from ThreadId to ThreadStatus. Instead we rely on the forked thread to broadcast its status to interested listeners. This should result in better performance (no lookup required).
Every exported symbol is now documented.
Regards, Roel & Bas van Dijk
[1] http://hackage.haskell.org/package/concurrent-extra-0.2 [2] http://hackage.haskell.org/package/threadmanager-0.1.3 _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
We just realized we missed an important opportunity in Control.Concurrent.Thread: When we fork the IO computation... http://hackage.haskell.org/packages/archive/concurrent-extra/0.2/doc/html/sr... ...we catch its potential exception and notify our listeners by wrapping the exception into Just and broadcasting it. However when the computation terminates normally without throwing an exception we notify our listeners by broadcasting Nothing, ignoring its return value (>>). This is unfortunate because we can easily broadcast the return value by choosing an 'Either SomeException a' instead of 'Maybe SomeException'. We have released a new version 0.3 that changes this: http://hackage.haskell.org/package/concurrent-extra-0.3 darcs get http://code.haskell.org/concurrent-extra regards, Roel and Bas van Dijk