Hi again,
I have tried to play around with MVar today, but
still... I did not see how to synchronize MVar without
the help of forkIO, and then explicitly call yield ::
IO (). But then, if I use forkIO I will create "daemon
threads" that will cause my program to terminates
immediately (back to the original problem).
I attached the source code to this email.
ps: If you can tell the depth of my understanding of
concurrent Haskell from my code, please do not
hesitate to evaluate it (Eg. am I using MVar
correctly? Any better method? etc.), since I am really
new to concurrent Haskell. Thanks.
Again, thank you for the help.
Sincerely,
Dennis Sidharta
--- Sven Panne
Dennis Sidharta wrote:
[ problems with concurrent Haskell ]
I can see two problems in your code:
* forkIO creates "daemon threads", so the program terminates immediately.
* Chan is an unbounded channel, so you won't get a "ping pong", which is probably what you expected. MVar is your friend here.
See
http://haskell.org/ghc/docs/latest/html/base/Control.Concurrent.html
Cheers, S.
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