blob: c60f9970391eeeb3c9c06ebbf6026592203b3b02 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
-- Test that threadDelay actually sleeps for (at least) as long as we
-- ask it
module Main (main) where
import Control.Concurrent
import Control.Monad
import System.Time
main = mapM_ delay (0 : take 11 (iterate (*5) 1))
delay n = do
tS <- getClockTime
threadDelay n
tE <- getClockTime
let req = fromIntegral n * 10 ^ (6 :: Int)
obs = case normalizeTimeDiff (diffClockTimes tE tS) of
TimeDiff 0 0 0 0 0 s ps -> 10^12 * fromIntegral s + ps
diff = obs - req
diff' :: Double
diff' = fromIntegral diff / 10^(12 :: Int)
when (obs < req) $ print (tS, tE, req, obs, diff, diff')
|
