#4813: Program hangs without -threaded option
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Reporter: mitar | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.1 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Attached program hangs without `-threaded` option very often (but not
always). With `-threaded` it works as it should (exits almost immediately
with an exception). As program does not use any FFI and almost none IO I
think this is a bug.
I wasn't able to remove use of [http://hackage.haskell.org/package/Etage
Etage] but I did simplified it much.
I tried to pin down the problem with debug messages in the library and it
seems that although the `SampleVar` (I use to mark that thread has
finished) is filled, main thread is still blocked on reading it. I have
tested this by printing things before and after writing and reading. So
print after writing is seen but reading is still waiting.
I am using 7.1.20101124. Tested both on Mac OS X and Linux amd64.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4813>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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