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Diffstat (limited to 'Utility/LockPool/Posix.hs')
| -rw-r--r-- | Utility/LockPool/Posix.hs | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Utility/LockPool/Posix.hs b/Utility/LockPool/Posix.hs index 506d7b560..db6b1d3dd 100644 --- a/Utility/LockPool/Posix.hs +++ b/Utility/LockPool/Posix.hs @@ -6,9 +6,11 @@ -} module Utility.LockPool.Posix ( + P.LockFile, LockHandle, lockShared, lockExclusive, + tryLockShared, tryLockExclusive, checkLocked, getLockStatus, @@ -35,11 +37,19 @@ lockShared mode file = makeLockHandle (P.waitTakeLock P.lockPool file LockShared) (F.lockShared mode file) +-- Takes an exclusive lock, blocking until the lock is available. lockExclusive :: Maybe FileMode -> LockFile -> IO LockHandle lockExclusive mode file = makeLockHandle (P.waitTakeLock P.lockPool file LockExclusive) (F.lockExclusive mode file) +-- Tries to take a shared lock, but does not block. +tryLockShared :: Maybe FileMode -> LockFile -> IO (Maybe LockHandle) +tryLockShared mode file = tryMakeLockHandle + (P.tryTakeLock P.lockPool file LockShared) + (F.tryLockShared mode file) + +-- Tries to take an exclusive lock, but does not block. tryLockExclusive :: Maybe FileMode -> LockFile -> IO (Maybe LockHandle) tryLockExclusive mode file = tryMakeLockHandle (P.tryTakeLock P.lockPool file LockExclusive) |