Joachim Breitner wrote:
Hi,
Am Mittwoch, den 07.02.2007, 11:05 +1100 schrieb Donald Bruce Stewart:
Am Dienstag, den 06.02.2007, 15:56 +0100 schrieb Fawzi Mohamed:
I am replying to myself, but anyway with it seems (from the documentation) that
forkIO (do{ waitForProcess pid; return () })
is the best solution, and does not seem to lead to wasted resources. This does not work for me. According to strace, the spawned process is in a blocking write, the haskell process is in a blocking waitpid, and I am sure that the program would consume all output.
Any difference with -threaded ?
Yes: Then it works. Strangely it also depends on which machine the same binary runs: On my desktop, it works even without threaded, but on the server it hangs.
Are there any disadvantages of -threaded? Zombie processes are not too bad, after all.
Probably not, for most uses. Perhaps the only remaining use for the non-threaded runtime is a multithreaded program that needs to call into a non-thread-safe foreign library (this is the issue affecting Gtk). It's possible that for 6.8 we could make -threaded the default; it's already what you get when you run under GHCi. Cheers, Simon