On Tue, 24 Aug 2004, Greg Stark wrote: > > Tom Lane <[EMAIL PROTECTED]> writes: > > > Chris <[EMAIL PROTECTED]> writes: > > > I've compiled 8.0 beta 1 on a R5900 V3.1 (a playstation 2) running > > > Linux (PS2 Linux 1) for portability testing. > > > ... > > > I'm wondering: would it be hard to fix the assembly spinlock code > > > for the R5900? > > > > According to the previous port report from Red Hat, the PS2 chip simply > > doesn't have any user-space TAS instruction, so you're pretty much stuck. > > If you can find something that works, let us know. > > Out of curiosity. If it lacks a tas instruction, is there really any smp > implementation that runs on it? Why would postgres want spinlocks at all with > only one processor?
Errm. Even if we have only one CPU it doesn't mean instructions which read/write to shared resources in a *multiprocess* environment will be serialized in the way we want. In fact, its highly unlikely that they will. If you want to test, make TAS() a noop and see how quickly things are corrupted in shared memory :-) Gavin ---------------------------(end of broadcast)--------------------------- TIP 8: explain analyze is your friend