16 Oct
2012
16 Oct
'12
4:16 p.m.
Since we're talking about forkIO here - not forkOS - is it possible to control the use of OS threads to avoid this problem? As I understand it, the problem is with real OS threads. A program running entirely in multiple `green' threads will fork to the same set of threads in the same state, creating no problem with internal state. I'm guessing this is why he sees the problem at 9 threads - maybe the runtime picks up another OS thread at that point. Of course one could link the unthreaded RTS, and that will cause everything, including runtime gc etc., to run in the parent thread, true? And there are some runtime options to control number of threads scheduled. Donn