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This commit is contained in:
Behdad Esfahbod 2018-07-24 18:00:14 -07:00
parent fb58cb4b5c
commit bf90f35302
1 changed files with 4 additions and 0 deletions
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4
src/hb-shaper-private.hh
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@ -97,6 +97,10 @@ HB_SHAPER_DATA_ENSURE_FUNC(shaper, object) (hb_##object##_t *object) \
retry: \
HB_SHAPER_DATA_TYPE (shaper, object) *data = (HB_SHAPER_DATA_TYPE (shaper, object) *) hb_atomic_ptr_get (&HB_SHAPER_DATA (shaper, object)); \
if (likely (data) && !(condition)) { \
/* Note that evaluating condition above can be dangerous if another thread
* got here first and destructed data. That's, as always, bad use pattern.
* If you modify the font (change font size), other threads must not be
* using it at the same time. */
/* Drop and recreate. */ \
/* If someone dropped it in the mean time, throw it away and don't touch it. \
* Otherwise, destruct it. */ \