[Haskell-cafe] One-shot? (was: Global variables and stuff)
gk at ninebynine.org
Thu Nov 11 06:44:17 EST 2004
At 11:31 11/11/04 +0000, Keean Schupke wrote:
>>Wouldn't it be easier to simply define "once" as a common Haskell library
>Erm, it is a library function (I provided the NamedSem library as an
>attachment)... Are you suggesting it would be nice to be able to do this
>without talking to the OS?
OK, I didn't sufficiently emphasize *common* library function. Maybe I
should have said "standard".
I'm not suggesting that the calling program should not use the operating
system, but that it should be insulated from the details of said OS. Not
all OSes have process IDs or named semaphores. This discussion has shown
many ways to implement "once", and which is best may depend upon the
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