[Haskell-cafe] Re: syscall, sigpause and EINTR on Mac OSX
joelr1 at gmail.com
Sun Dec 11 13:25:47 EST 2005
Understood. But I'm printing things in the signal handler to show
that it was triggered. And I trigger it when ^C is pressed (well, one
initSnippets :: IO ()
installHandler sigPIPE Ignore Nothing
flip mapM_ [sigTERM, sigINT] $ \sig -> do
installHandler sig (handler sig) Nothing
where handler sig = Catch $
do trace_ $ "Signal " ++ show sig +
+ " caught."
trace_ "Broadcasting Quit..."
broadcast (ForcedQuit :: Event ())
This way I know what the signal was that triggered the handler and I
can tell that it was triggered. The deadlock is somewhere else
because the handler is not being tripped.
The issue of the signal handler being tripped by a phantom ^C (signal
2) is another issue entirely.
On Dec 11, 2005, at 6:10 PM, Branimir Maksimovic wrote:
> Though I frorgot to add that deadlock can be caused by signal
> somewhere else
> (eg other thread) if signal handler eg locks mutex internally or
> calls some
> other non asynchronous safe functions like locking functions.
> This is likely scenario, if you doubt at signal handlers but I
> don;t know the details
> . Deadlocks can be caused by other things, not neccessarily signals.
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