On 03/02/13 03:25, Juan Francisco Cantero Hurtado wrote:
On 01/13/13 22:37, Juan Francisco Cantero Hurtado wrote:
On 01/13/13 11:20, Søren Sandmann wrote:
Søren Sandmann <[email protected]> writes:
Juan Francisco Cantero Hurtado <[email protected]> writes:
OpenBSD and gcc 4.2 (the default compiler) don't support thread local
storage.
In that case, it should fall back to pthread_setspecific(). Can you try
putting in a #error above "#include <pthread.h>" in pixman-compiler.h
and see if compilation fails.
It's possible there is a bug in the pthread_setspecific() fallback in
pixman, but if so, I couldn't reproduce it on Linux by forcing
pthread_setspecific() and running the test suite.
Does the test suite pass for you if you run "make check"?
I found this thread:
https://groups.google.com/forum/?fromgroups=#!topic/comp.unix.bsd.openbsd.misc/y-qciyc6wNY
in which Marc Espie says that pthreads on OpenBSD 4.2 is a purely
userspace thread library.
Since the backtrace you posted included multiple threads, I'm guessing
those are kernel threads, which means pthread_setspecific() can't work
on them.
If this diagnosis is right, then pixman currently can't support threads
on OpenBSD 4.2. Support could potentially be added, but it would have to
be done (and maintained) by someone who understands threads on OpenBSD.
OpenBSD changed from user-level to kernel-level threads in the last
release (5.2). I'll mail to the maintainer of pixman on OpenBSD, my
knowledge of OpenBSD internals isn't enough for help you with the bug.
I've been doing some tests the last month. The error occur in pixman
0.28 and 0.29.2 when SSE is enabled. If I disable SSE in the configure
script of pixman 0.28, all works.
I forgot add that disable SSE2 in pixman isn't a good fix for OpenBSD
because only one program crashes with SSE2 enabled on i386 (it works
amd64). Can you give me any guidance for help you with the fix of the
bug?. If you suspect is a bug in OpenBSD, a little test code would be
great because I could show the problem to OpenBSD devs.
Thanks.
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