Re: RE: [COMMITTERS] pgsql/src/backend/access/transam ( xact.c xlog.c)

* Bruce Momjian <pgman@candle.pha.pa.us> [001117 11:39]:
> > * Bruce Momjian <pgman@candle.pha.pa.us> [001117 11:23]:
> > > > > sleep(3) should conform to POSIX specification, if anyone has the
> > > > > reference they can check it to see what the effect of sleep(0)
> > > > > should be.
> > > > 
> > > >   Yes, but Posix also specifies sched_yield() which rather explicitly
> > > > allows a process to yield its timeslice.  No idea how well that is
> > > > supported.
> > > 
> > > I have it on BSDI.  We could add a configure check, and use it if it is
> > > there.  Another idea is to add a shared memory flag when someone enters
> > > the 'commit' section of the transaction code.  That way, a backend could
> > > check to see if another process is _about_ to commit, and wait.
> > On UnixWare, it requires the -Kthread or -Kpthread command, which then
> > links in the threads library...
> > 
> > I'm not sure that this is a good thing or not....
> 
> I would hope it just calls the function, and does not bring in thread
> startup stuff.
I suspect it DOES bring in the thread startup and all that implies...

Tread lightly.  The good news is UnixWare Threads are LWP's and the
kernel is multithreaded...

LER

> 
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>   Bruce Momjian                        |  http://candle.pha.pa.us
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Larry Rosenman                      http://www.lerctr.org/~ler
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