Re: Interruptible sleeps (was Re: CommitFest 2009-07: Yay, Kevin! Thanks, reviewers!)

Markus Wanner <markus@bluegap.ch> writes:
> Is pselect() really as unportable as stated in the patch? What platforms 
> have problems with pselect()?

Well, it's not defined in the Single Unix Spec, which is our customary
reference for portability.  Also, it's alleged that some platforms have
it but in a form that's not actually any safer than select().  For
example, I read in the Darwin man page for it

IMPLEMENTATION NOTES    The pselect() function is implemented in the C library as a wrapper    around select().

and that man page appears to be borrowed verbatim from FreeBSD.

> Using the self-pipe trick, don't we risk running into the open file 
> handles limitation? Or is it just two handles per process?

It's just two handles per process.
        regards, tom lane