make LockPool's LockHandle be able to support multiple different types of file locks
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3 changed files with 37 additions and 21 deletions
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@ -35,25 +35,25 @@ import Prelude
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lockShared :: Maybe FileMode -> LockFile -> IO LockHandle
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lockShared mode file = makeLockHandle
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(P.waitTakeLock P.lockPool file LockShared)
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(F.lockShared mode file)
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(mk <$> F.lockShared mode file)
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-- Takes an exclusive lock, blocking until the lock is available.
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lockExclusive :: Maybe FileMode -> LockFile -> IO LockHandle
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lockExclusive mode file = makeLockHandle
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(P.waitTakeLock P.lockPool file LockExclusive)
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(F.lockExclusive mode file)
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(mk <$> F.lockExclusive mode file)
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-- Tries to take a shared lock, but does not block.
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tryLockShared :: Maybe FileMode -> LockFile -> IO (Maybe LockHandle)
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tryLockShared mode file = tryMakeLockHandle
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(P.tryTakeLock P.lockPool file LockShared)
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(F.tryLockShared mode file)
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(fmap mk <$> F.tryLockShared mode file)
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-- Tries to take an exclusive lock, but does not block.
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tryLockExclusive :: Maybe FileMode -> LockFile -> IO (Maybe LockHandle)
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tryLockExclusive mode file = tryMakeLockHandle
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(P.tryTakeLock P.lockPool file LockExclusive)
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(F.tryLockExclusive mode file)
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(fmap mk <$> F.tryLockExclusive mode file)
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-- Returns Nothing when the file doesn't exist, for cases where
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-- that is different from it not being locked.
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@ -68,4 +68,10 @@ getLockStatus file = P.getLockStatus P.lockPool file
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(F.getLockStatus file)
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checkSaneLock :: LockFile -> LockHandle -> IO Bool
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checkSaneLock lockfile (LockHandle _ fh) = F.checkSaneLock lockfile fh
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checkSaneLock lockfile (LockHandle _ flo) = fCheckSaneLock flo lockfile
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mk :: F.LockHandle -> FileLockOps
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mk h = FileLockOps
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{ fDropLock = F.dropLock h
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, fCheckSaneLock = \f -> F.checkSaneLock f h
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}
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