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------------------------------------------------------------------------------
-- |
-- Module: Xmobar.X11.Events
-- Copyright: (c) 2018, 2022 Jose Antonio Ortega Ruiz
-- License: BSD3-style (see LICENSE)
--
-- Maintainer: jao@gnu.org
-- Stability: unstable
-- Portability: portable
-- Created: Sun Nov 25, 2018 23:24
--
--
-- Utilities or event handling
--
------------------------------------------------------------------------------
module Xmobar.X11.Events(nextEvent') where
import qualified Control.Concurrent as C
import qualified System.Posix.Types as T
import qualified Graphics.X11.Xlib as X
-- | A version of nextEvent that does not block in foreign calls.
nextEvent' :: X.Display -> X.XEventPtr -> IO ()
nextEvent' d p = do
pend <- X.pending d
if pend /= 0
then X.nextEvent d p
else do
C.threadWaitRead (T.Fd fd)
nextEvent' d p
where
fd = X.connectionNumber d
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