On Thu, Dec 15, 2005 at 09:32:38AM +0000, Joel Reymont wrote: > Well, my understanding is that once I do a takeMVar I must do a > putMVar under any circumstances. This is why I was blocking checkTimers.
Perhaps you could use modifyMVar: http://www.haskell.org/ghc/docs/latest/html/libraries/base/Control-Concurrent-MVar.html#v%3AmodifyMVar modifyMVar_ :: MVar a -> (a -> IO a) -> IO () A safe wrapper for modifying the contents of an MVar. Like withMVar, modifyMVar will replace the original contents of the MVar if an exception is raised during the operation. modifyMVar :: MVar a -> (a -> IO (a, b)) -> IO b A slight variation on modifyMVar_ that allows a value to be returned (b) in addition to the modified value of the MVar. Best regards Tomasz -- I am searching for a programmer who is good at least in some of [Haskell, ML, C++, Linux, FreeBSD, math] for work in Warsaw, Poland _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
