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-rw-r--r--src/Utility/ConcurrentOutput.hs4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/Utility/ConcurrentOutput.hs b/src/Utility/ConcurrentOutput.hs
index 301a89bc..03771bfd 100644
--- a/src/Utility/ConcurrentOutput.hs
+++ b/src/Utility/ConcurrentOutput.hs
@@ -83,7 +83,11 @@ 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)