propellor spin

1 files changed, 10 insertions, 1 deletions

diff --git a/src/Utility/ConcurrentOutput.hs b/src/Utility/ConcurrentOutput.hs
index 40e0125e..4d74e090 100644
--- a/src/Utility/ConcurrentOutput.hs
+++ b/src/Utility/ConcurrentOutput.hs
@@ -85,7 +85,11 @@ takeOutputLock' block = go =<< withLock tryTakeTMVar
 				( havelock
 				, if block
 					then do
+						hPutStr stderr "WAITFORPROCESS in lock"
+						hFlush stderr
 						void $ P.waitForProcess h
+						hPutStr stderr "WAITFORPROCESS in lock done"
+						hFlush stderr
 						havelock
 					else do
 						withLock (`putTMVar` orig)
@@ -133,7 +137,12 @@ withConcurrentOutput a = a `finally` drain
   where
 	-- Just taking the output lock is enough to ensure that anything
 	-- that was buffering output has had a chance to flush its buffer.
-	drain = lockOutput (return ())
+	drain = do
+		hPutStrLn stderr "DRAIN"
+		hFlush stderr
+		lockOutput (return ())
+		hPutStrLn stderr "DRAIN DONE"
+		hFlush stderr
 
 -- | Displays a string to stdout, and flush output so it's displayed.
 --