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[atexit] Make hb_languate_item_t *langs freeing threadsafe 

Part of https://github.com/harfbuzz/harfbuzz/issues/923
This commit is contained in:
Behdad Esfahbod 2018-03-28 15:33:51 -07:00
parent 8c9451107d
commit 5aa2c6e194
1 changed files with 10 additions and 5 deletions
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15
src/hb-common.cc
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@ -252,11 +252,16 @@ static hb_language_item_t *langs;
static void
free_langs (void)
{
while (langs) {
hb_language_item_t *next = langs->next;
langs->finish ();
free (langs);
langs = next;
retry:
hb_language_item_t *first_lang = (hb_language_item_t *) hb_atomic_ptr_get (&langs);
if (!hb_atomic_ptr_cmpexch (&langs, first_lang, nullptr))
goto retry;
while (first_lang) {
hb_language_item_t *next = first_lang->next;
first_lang->finish ();
free (first_lang);
first_lang = next;
}
}
#endif