On Sat, 31 Dec 2005, Greg Stark wrote:
>
> Qingqing Zhou <zhouqq@cs.toronto.edu> writes:
>
> >
> > Is that by default the EINTR is truned off in NFS? If so, I don't see that
> > will be a problem. Sorry for my limited knowledge, is there any
> > requirements/benefits that people turn on EINTR?
>
> That's why the "intr" option (and the "soft") option has traditionally not
> been enabled by default in NFS implementations. But many people don't like
> that when their NFS server disappears their client applications become
> unkillable. They like to be able to hit C-c and stop whatever is running.
>
Thanks Greg and Martin, I now understand better of intr :-) So we can
killed Postgres or not depends on our signal handler. Query Cancel signal
won't work because "ImmediateInterruptOK" forbids it and the retry style
code in read/write will put the Postgres process into uninterruptable
sleep again. But die signal will work I think.
Regards,
Qingqing