#4456: Missing atexit symbol
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Reporter: mitar | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 7.0.2
Component: GHCi | Version: 6.12.3
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Linux | Blocking:
Architecture: x86_64 (amd64) | Failure: None/Unknown
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Comment(by mitar):
OK. Later on I found more. In FFI code (when compiled with GHC) you should
really not use `atexit` (if you do not use some mutex or something). I was
getting segment faults because I used `atexit` to cleanup. But at the same
time I called cleanup from Haskell when program was exiting. The result
was (because I didn't have any special mutex around cleanup code) that
cleanup was getting called twice (and it seems even at the same time).
Probably because I called cleanup from one Haskell thread and `atexit` was
called from main program thread. So there is some interaction going on.
Hm, now that I think I see that the problem was probably because I didn't
wait for all threads to finish (one of them was doing FFI cleanup) before
main thread exited. So this is probably why it happened that that cleanup
function was called twice.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4456#comment:2>
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