On 21-Aug-13, at 1:57 PM, Carlos O'Donell wrote:
On Tue, Aug 20, 2013 at 11:20 AM, John David Anglin
<dave.anglin@xxxxxxxx> wrote:
Hi Carlos,
Yes, it been there for many years but it doesn't use glibc's
atomic.h. It
directly
does light-weight system calls into kernel. The implementation is
very
similar to arm.
See: libgcc/config/pa/linux-atomic.c.
Helge did the initial implementation and I have fixed a few bugs in
it.
I changed to using this atomic support in the qt4-x11 package
because the
existing
ldcw based locking broke the qt4smoke package build. I need to
submit my
patch
somewhere.
Awesome. Responded to Guy Martin with this info.
I noticed today that the /usr/bin/dot command was dropping core. It
generates several
threads when it runs.
Looking at one of the dumps, it turned out that the exception was in
g_private_get. This
involves various atomic operations. Looking at the glib2.0 atomic
implementation,
I see it depends on the GCC cpp define
__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4.
Because of the library implementation, this symbol isn't being
defined. So, glib2.0's
atomic support isn't atomic.
I'm looking at a GCC change to define the above. Maybe this will
help. The situation might
be similar for other packages.
Dave
--
John David Anglin dave.anglin@xxxxxxxx
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