Bugs item #715052, was opened at 2003-04-03 19:33
You can respond by visiting:
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Category: Compiler
Group: 5.04.3
>Status: Closed
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: getCPUTime doesn't work
Initial Comment:
I use GHC5.04.3 on windows XP.
I want to getCPUTime function to get a number used as
a random seed.
The getCPUTime works well in GHCi(always
increasing), but when
compiled by ghc, the return value of getCPUTime is
fixed to two
values.This can be demonstrated by:
import CPUTime
main = do
d<-getCPUTime
print d
　　　　　　　　Liu Junfeng
　　　　　　　　[EMAIL PROTECTED]
　　　　　　　　　　2003-04-03
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>Comment By: Sigbjorn Finne (sigbjorn)
Date: 2003-04-04 07:33
Message:
Logged In: YES
user_id=232905
This is expected behaviour, as the value returned by
CPUTime.getCPUTime is process-relative.
You probably want to consult Time.getClockTime also when
manufacturing the seed -- here's how (the non-exported)
Random.mkStdRNG is defined:
mkStdRNG :: Integer -> IO StdGen
mkStdRNG o = do
ct <- getCPUTime
(TOD sec _) <- getClockTime
return (createStdGen (sec * 12345 + ct + o))
----------------------------------------------------------------------
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