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{- git-annex lock pool
-
- Copyright 2012, 2014 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE CPP #-}
module Annex.LockPool where
import Common.Annex
import Annex
import Types.LockPool
import qualified Data.Map as M
#ifndef mingw32_HOST_OS
import Annex.Perms
#else
import Utility.WinLock
#endif
{- Create a specified lock file, and takes a shared lock. -}
lockFile :: FilePath -> Annex ()
lockFile file = go =<< fromPool file
where
go (Just _) = noop -- already locked
go Nothing = do
#ifndef mingw32_HOST_OS
mode <- annexFileMode
lockhandle <- liftIO $ noUmask mode $
openFd file ReadOnly (Just mode) defaultFileFlags
liftIO $ waitToSetLock lockhandle (ReadLock, AbsoluteSeek, 0, 0)
#else
lockhandle <- liftIO $ waitToLock $ lockShared file
#endif
changePool $ M.insert file lockhandle
unlockFile :: FilePath -> Annex ()
unlockFile file = maybe noop go =<< fromPool file
where
go lockhandle = do
#ifndef mingw32_HOST_OS
liftIO $ closeFd lockhandle
#else
liftIO $ dropLock lockhandle
#endif
changePool $ M.delete file
getPool :: Annex LockPool
getPool = getState lockpool
fromPool :: FilePath -> Annex (Maybe LockHandle)
fromPool file = M.lookup file <$> getPool
changePool :: (LockPool -> LockPool) -> Annex ()
changePool a = do
m <- getPool
changeState $ \s -> s { lockpool = a m }
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