remove reapZombies

Believed to be no longer needed as I've squashed the last ones.

Note that, in Test.Framework, I can see no reason for the code to have
run it twice. It does not cause running processes to exit after all,
so any process that has leaked and is running and causing problems with
cleanup of the directory won't be helped by running it.

This commit was sponsored by Mark Reidenbach on Patreon.

Annex/Action.hs

@@ -5,20 +5,13 @@
  - Licensed under the GNU AGPL version 3 or higher.
  -}
 
-{-# LANGUAGE CPP #-}
-
 module Annex.Action (
 	startup,
 	shutdown,
 	stopCoProcesses,
-	reapZombies,
 ) where
 
 import qualified Data.Map as M
-#ifndef mingw32_HOST_OS
-import System.Posix.Process (getAnyProcessStatus)
-import Utility.Exception
-#endif
 
 import Annex.Common
 import qualified Annex
@@ -38,7 +31,6 @@ shutdown nocommit = do
 	saveState nocommit
 	sequence_ =<< M.elems <$> Annex.getState Annex.cleanup
 	stopCoProcesses
-	liftIO reapZombies -- zombies from long-running git processes
 
 {- Stops all long-running git query processes. -}
 stopCoProcesses :: Annex ()
@@ -47,19 +39,3 @@ stopCoProcesses = do
 	checkAttrStop
 	hashObjectStop
 	checkIgnoreStop
-
-{- Reaps any zombie processes that may be hanging around.
- -
- - Warning: Not thread safe. Anything that was expecting to wait
- - on a process and get back an exit status is going to be confused
- - if this reap gets there first. -}
-reapZombies :: IO ()
-#ifndef mingw32_HOST_OS
-reapZombies =
-	-- throws an exception when there are no child processes
-	catchDefaultIO Nothing (getAnyProcessStatus False True)
-		>>= maybe (return ()) (const reapZombies)
-
-#else
-reapZombies = return ()
-#endif

Benchmark.hs

@@ -15,7 +15,6 @@ import CmdLine
 import CmdLine.GitAnnex.Options
 import qualified Annex
 import qualified Annex.Branch
-import Annex.Action
 
 import qualified Options.Applicative as O
 
@@ -35,10 +34,6 @@ mkGenerator cmds userinput = do
 			-- The cmd is run for benchmarking without startup or
 			-- shutdown actions.
 			Annex.eval st $ performCommandAction cmd seek noop
-		-- Since the cmd will be run many times, some zombie
-		-- processes that normally only occur once per command
-		-- will build up; reap them.
-		reapZombies
   where
 	-- Simplified versio of CmdLine.dispatch, without support for fuzzy
 	-- matching or out-of-repo commands.

Test/Framework.hs

@@ -245,15 +245,13 @@ cleanup dir = whenM (doesDirectoryExist dir) $ do
 
 finalCleanup :: IO ()
 finalCleanup = whenM (doesDirectoryExist tmpdir) $ do
-	Annex.Action.reapZombies
 	Command.Uninit.prepareRemoveAnnexDir' tmpdir
 	catchIO (removeDirectoryForCleanup tmpdir) $ \e -> do
 		print e
 		putStrLn "sleeping 10 seconds and will retry directory cleanup"
 		Utility.ThreadScheduler.threadDelaySeconds $
 			Utility.ThreadScheduler.Seconds 10
-		whenM (doesDirectoryExist tmpdir) $ do
-			Annex.Action.reapZombies
+		whenM (doesDirectoryExist tmpdir) $
 			removeDirectoryForCleanup tmpdir
 
 checklink :: FilePath -> Assertion