Re: Win32 open items

"Magnus Hagander" <mha@sollentuna.net> writes:
> Here is an attempt at this. First patch contains the changes to libpq,
> second patch contains changes to psql to use this API. Docs not updated
> yet, pending approval of the general idea at least :)

I think it would be better to dispense with the PQgetCancelError
function and just make the signature of PQcancel be
    int PQcancel(PGcancel *cancel, char *errbuf, int errbuflen);
where errbuf would normally point to a local array in the calling
function.

As-is, PQcancel is itself not thread safe because it is scribbling
on the PGcancel struct.  I thought the whole point of this exercise
was to allow multiple threads to use the PGcancel struct; which seems
to me to imply that it had better be read-only to PQcancel.

We don't need the cancelConnLock if this is done properly (at least,
assuming that storing a pointer is atomic, which seems reasonable).

            regards, tom lane