On Sat, 2002-05-04 at 21:56, Tom Lane wrote: > mlw <[EMAIL PROTECTED]> writes: > > We could provide a PGSemaphore based on an APR mutex and a counter, > > but I'm not sure of the performance impact. We may want to implement a > > "generic" semaphore like this and one optimized for platforms which we > > have development resources. > > Once we have the internal API redone, it should be fairly easy to > experiment with alternatives like that. > > I'm planning to work on this today (need a break from thinking about > schemas ;-)). I'll run with the API I sketched yesterday, since no one > objected. Although I'm not planning on doing anything to the API of the > shared-mem routines, I'll break them out into a replaceable file as > well, just in case anyone wants to try a non-SysV implementation.
Would it be too hard to make them macros, so those which dont need shared mem at all (embedded single-user systems) could avoid the performance impact altogether. ---------------- Hannu ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://archives.postgresql.org
