raising exceptions for signals

[Simon Marlow]

Bulat Ziganshin wrote:
>>> btw, how about using for *Haskell* code *default* signal handler that
>>> raise Haskell exception? i think that using signal handlers to process
>>> OS-generated events is just legacy from the C days. i.e. 'main'
>>> should be called by RTS inside code like this:
>>>
>>>   mainThread <- myThreadId
>>>   let onBreak event = do
>>>         throwTo mainThread BreakException
>>>   bracket (installHandler$ Catch onBreak) (installHandler) $  \oldHandler -> do
>>>     main
>>>
>>> (of course, this handles only ^Break and only on Windows)
>>>
>>> among other things, this should make signal handling portable between
>>> Win/Unix
> 
>> Yes, we've discussed this in the past (e.g. there was a thread about this on the
>> haskell-prime list).  I'm definitely in favour of doing something along these lines.
> 
> how about adding such facility to ghc HEAD? i can write initial
> windows implementation and put it to discussion here or in ghc
> maillist

I don't have a clear idea for the design, I'd have to go back and look at the 
haskell prime discussion.  Do you want to propose something?

Cheers,
	Simon