Tom Lane wrote: > > mlw <[EMAIL PROTECTED]> writes: > > Upon doing some inspection of apache 2.x, it seems that me making a SysV > > Windows .DLL for PostgreSQL, while a cool project, would be unnecessary. > > > The APR (Apache Portable Runtime) seems to have all the necessary support. > > Does it? AFAICT they intend to provide mutexes not counting semaphores. > Their implementation atop SysV semaphores would work the way we need > (ie, remember multiple unlocks arriving before a lock operation), but > I'm unclear on whether any of the other ones would.
Ok, you got me, they do not provide a semaphore, only mutexes. We should be able to use APR in PostgreSQL, I'll implement a semaphore directory for Windows and UNIX. Someone will have to handle the Netware, beos and OS/2. (I may be able to do the OS/2 stuff, but it has, in fact, been 6 years since I even looked at OS/2 in any form.) 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. ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
