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This adds _cairo_atomic_int_get_relaxed and _cairo_atomic_int_set_relaxed which
are meant to have a behaviour of relaxed read/writes in C11's memory model. This
patch also uses these new function to fix a data race with freed_pool_t's |top|
data member.
Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=90318
Signed-off-by: Wan-Teh Chang <wtc@google.com>
Signed-off-by: Uli Schlachter <psychon@znc.in>
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Having spent the last dev cycle looking at how we could specialize the
compositors for various backends, we once again look for the
commonalities in order to reduce the duplication. In part this is
motivated by the idea that spans is a good interface for both the
existent GL backend and pixman, and so they deserve a dedicated
compositor. xcb/xlib target an identical rendering system and so they
should be using the same compositor, and it should be possible to run
that same compositor locally against pixman to generate reference tests.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
P.S. This brings massive upheaval (read breakage) I've tried delaying in
order to fix as many things as possible but now this one patch does far,
far, far too much. Apologies in advance for breaking your favourite
backend, but trust me in that the end result will be much better. :)
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Still hopelessly broken. Requires compiling cairo to use static linking
and then still requires manual linkage to workaround libtool. Lots of
functionality is still absent - we need to either find analogues to some
Cairo operations or implement fallbacks - but it is sufficient to
investigate how Skia functions in direct comparison with Cairo for
tessellation/rasterisation.
Caveat emptor.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Clips end up recursing more than 4 levels and so we need a larger stash
to avoid mallocs.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Conditional compilation was needed to avoid warnings:
cairo-clip.c:51: warning: ‘clip_path_pool’ defined but not used
cairo.c:181: warning: ‘context_pool’ defined but not used
They can be avoided by making sure that _freed_pool_reset(ptr)
actually consumes its argument. This has the pleasant side-effect that
forgetting to properly reset a freed-pool now results in a warning if
atomic ops are disabled/not available.
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Argh. This bug has been here for quite some time and only showed itself
with a corrupt pointer on ppc32. Since the erroneous write is inside the
block, it remained undetected by valgrind.
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_atomic_fetch() was expected to replace the content of a slot with
NULL and return the old content, but it incorrectly returned the
previous content even if it was unable to perform the exchange
(because of conflicts with other threads accessing the pool).
Fix suggested by Chris Wilson <chris@chris-wilson.co.uk>
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Some implementations only offer one version of compare-and-exchange,
thus we expose both through cairo-atomic, implementing what is missing
through appropriate fallbacks.
*_cmpxchg() now return a boolean (this unbreaks _cairo_atomic_uint_cmpxchg)
*_cmpxchg_return_old() return the old value
Code is updated everywhere to reflect this, by using *_cmpxchg()
wherever the returned value was only tested to check if the exchange
had really taken place.
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
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I updated the Free Software Foundation address using the following script.
for i in $(git grep Temple | cut -d: -f1 )
do
sed -e 's/59 Temple Place[, -]* Suite 330, Boston, MA *02111-1307[, ]* USA/51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA/' -i "$i"
done
Fixes http://bugs.freedesktop.org/show_bug.cgi?id=21356
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Discard some duplicate code and shared a single freed object pointer
pool between the pattern and clip.
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