Re: Réf. :c++ exceptions and signals

[Joe Buck <jbuck at Synopsys dot COM>]

> You can't throw an exception from a signal handler.
> 
> There is a workaround but I think it's a dirty trick :
> the basic idea is to use setjmp/longjmp to exit the
> signal handler and jump back into the block
> associated with the try/catch to throw the exception.

The problem with your workaround is that destructors for any automatic
objects constructed after the setjmp call and still alive at the longjmp
call will not be invoked, resulting in memory leaks.

If we really wanted to permit exceptions from signal handlers, we'd
need to invent some mechanism to queue the exception and throw it
at "safe" points.  But there would be overhead for this: some sort of
polling and/or locking would need to be added.