Merge of nickrob-async-20060513 to mainline?

[Daniel Jacobowitz]

On Fri, Oct 06, 2006 at 03:10:37PM +1300, Nick Roberts wrote:
> Yes I think so.  I don't quite follow the explanation of pselect in the manpage
> but I think you're saying that the signal handler for SIGCHLD will run even
> when GDB is already in select, and can get GDB's attention by writing to a
> pipe with a file descriptor that select is watching.

Exactly.  Actually, getting the signal may also knock GDB out of the
select syscall; that depends on whether the "SA_RESTART" flag is used.
But you want to rely on the pipe, as there are fewer corner cases.

-- 
Daniel Jacobowitz
CodeSourcery