a simple full barrier ?

static int chnget_opcode_perf_k(CSOUND *csound, CHNGET *p)
{
#ifdef HAVE_ATOMIC_BUILTIN
    __sync_synchronize();
#endif
    *(p->arg) = *(p->fp);
    return OK;
}

On Thu, Aug 22, 2013 at 03:01:35PM -0400, Steven Yi wrote:
> I'm assuming that the pd lib I'm building will also fail then. Not
> sure of a solution either.
> 
> On Thu, Aug 22, 2013 at 1:56 PM, Victor Lazzarini
> <Victor.Lazzarini@nuim.ie> wrote:
> > No, but for the moment, I am not doing i386 anymore.
> > On 22 Aug 2013, at 16:28, Steven Yi wrote:
> >
> >> Have you tried compiling with clang?  I've had problems with the
> >> atomic stuff on Windows i386, but that was in linking. (Didn't even
> >> get to runtime. :P ).
> >>
> >> On Thu, Aug 22, 2013 at 6:56 AM, Victor Lazzarini
> >> <Victor.Lazzarini@nuim.ie> wrote:
> >>> It appears that there is a problem with _sync_fetch_and_add  in the i386 architecture. I am
> >>> get segfaults at bus.c:586
> >>>
> >>> Program received signal EXC_BAD_ACCESS, Could not access memory.
> >>> Reason: KERN_PROTECTION_FAILURE at address: 0x00000000
> >>> 0x0003fe98 in chnget_opcode_perf_k (csound=0x800000, p=0x894a78) at /Users/victor/src/csound6/OOps/bus.c:586
> >>> 586         x.i = __sync_fetch_and_add((MYFLT_INT_TYPE *) p->fp, 0);
> >>>
> >>> Compiling without any optimisation appears to stop the segfault, and the code seems to work. So if it was
> >>> the case that the intrinsic did not exist for int64_t in i386, it would not suddenly start to work.
> >>>
> >>> Not sure how to solve this.
> >>>
> >>> gcc version 4.2.1 (Apple Inc. build 5666)
> >>>
> >>> Dr Victor Lazzarini
> >>> Senior Lecturer
> >>> Dept. of Music
> >>> NUI Maynooth Ireland
> >>> tel.: +353 1 708 3545
> >>> Victor dot Lazzarini AT nuim dot ie
> >>>

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