Re: Netscape broken with 2.2.0-pre7
Jamie Lokier (lkd@tantalophile.demon.co.uk)
Mon, 18 Jan 1999 23:22:41 +0000
On Sun, Jan 17, 1999 at 07:36:43PM +0100, Andi Kleen wrote:
> > It doesn't look like a signal thing so much as an abuse of a pipe. It's
> > pretty clear Netscape _could_ use an internal circular buffer instead of
> > an OS pipe. Then again, maybe that would just add to the many memory
> > leaks :-)
>
> It can't. You can't poll a circular buffer in a select/poll. That is why
> the self pipe trick is often used to pass information from signal handlers
> to the main loop.
You don't need to poll the buffer in select/poll. On entry to select,
if the buffer is non-empty, don't call select... (simple :-)
If a signal handler inserts into the buffer, it can interrupt the select
call (with EINTR), which can check the buffer before trying again.
-- Jamie
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