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better lock dropping order

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Joey Hess 2015-11-13 12:36:37 -04:00
parent bb4123a649
commit e31a51c5bb
Failed to extract signature
1 changed files with 6 additions and 3 deletions
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9
Utility/LockFile/PidLock.hs
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@ -20,7 +20,6 @@ import Utility.PartialPrelude
import Utility.Exception
import Utility.Applicative
import Utility.Directory
import Utility.ThreadScheduler
import Utility.Monad
import Utility.Path
import Utility.FileMode
@ -127,10 +126,14 @@ waitLock (Seconds timeout) lockfile = go timeout
error $ "Gave up waiting for possibly stale pid lock file " ++ lockfile
dropLock :: LockHandle -> IO ()
dropLock (LockHandle lockfile fd plh) = do
dropLock (LockHandle lockfile fd sidelock) = do
-- Drop side lock first, at which point the pid lock will be
-- considered stale.
-- The side lock file cannot be deleted because another process may
-- have it open and be waiting to lock it.
maybe noop Posix.dropLock sidelock
closeFd fd
nukeFile lockfile
maybe noop Posix.dropLock plh
getLockStatus :: LockFile -> IO LockStatus
getLockStatus = maybe StatusUnLocked (StatusLockedBy . lockingPid) <$$> readPidLock