Re: Spinlocks

> I am trying to implement the spinlocks with pthreads. However,
> multithreading does not work for me, there seems to be a race condition
> somewhere, since it hangs if I run it normally, but not if I run it under
> gdb. Valgrind says the following:
>
> ==24848== Possible data race during write of size 8 at 0x90560c8 by thread
> #1 ==24848==    at 0x40B481: kperf (csound.c:1320)
> ==24848==    by 0x40B8B1: csoundPerform (csound.c:1447)
> ==24848==    by 0x40550E: main (csound_main.c:136)
> ==24848==  This conflicts with a previous read of size 8 by thread #3
> ==24848==    at 0x40AF5D: kperfThread (csound.c:1226)
> ==24848==    by 0x4C27ABF: mythread_wrapper (hg_intercepts.c:194)
> ==24848==    by 0x5092FA9: start_thread (in /lib/libpthread-2.9.so)
> ==24848==    by 0x61C42CC: clone (in /lib/libc-2.9.so)
>
>
> I'm not sure if this is relevant, it is the multiThreadedStart variable
> that conflicts. Maybe the reads and writes of it should be protected?
>
> El 30/04/09 10:22 Felipe Sateler escribió:
> > Pthreads-w32 (which is what I think you are using on windows) claims to
> > support it. Can someone from the mac world confirm if they are
> > available?
> >
> > El 30/04/09 01:44 Michael Gogins escribió:
> > > Insofar as I recall, which may not be all that far, the pthread
> > > spinlocks were not available on all platforms.
> > >
> > > if they are, they would be better, I think.
> > >
> > > Regards,
> > > Mike
> > >
> > > On 4/29/09, Felipe Sateler <fsateler@...> wrote:
> > > > I have received a report that csound does not build on SPARC
> > > > machines
> > > > due to some issues with __sync_* intrinsics. While I am still trying
> > > > to debug the issue, the question of why these intrinsics were used
> > > > in
> > > > the first place was raised. In fact, we already use pthread, and
> > > > pthread provides spinlocks too. Is there any reason for not using
> > > > the
> > > > pthread ones?
> > > >
> > > > Saludos,
> > > > Felipe Sateler
> >
> > Saludos,
> > Felipe Sateler
>
> Saludos,
> Felipe Sateler