REF use when luke

2020-03-25 16:34:38 -04:00 · 2020-03-25 16:34:38 -04:00 · e8cf056301
parent 0ba68a457b
commit e8cf056301
1 changed files with 4 additions and 6 deletions
--- a/lib/WorkspaceMon.hs
+++ b/lib/WorkspaceMon.hs
@ -97,9 +97,7 @@ waitAndKill tag pid = waitUntilExit pidDir
 withUniquePid :: WatchedPIDs -> Pid -> IO () -> IO ()
 withUniquePid curPIDs pid f = do
  pids <- readMVar curPIDs
-  if pid `elem` pids
-    then return ()
-    else do
+  unless (pid `elem` pids) $ do
    modifyMVar_ curPIDs (return . (pid:))
    f
    modifyMVar_ curPIDs (return . filter (/=pid))