On 13 May 2012 02:48, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> One possible answer is to just legislate that callers mustn't specify
> WL_SOCKET_WRITABLE without WL_SOCKET_READABLE (either just as
> documentation, or probably better with an Assert check). The existing
> callers would all be fine with this, and I'm not sure whether there will
> ever be a case where we'd like to wait on a write-only socket.
+1 . Let the improbable requirement of being able to wait on a
write-only socket actually emerge before we engineer a solution.
I think that we might have avoided accepting the poll()-based
implementation in the first place if these subtleties were considered
earlier, since IIRC the justification for introducing it was rather
weak.
--
Peter Geoghegan http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training and Services
