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Make default_language threadsafe

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This commit is contained in:
Behdad Esfahbod 2012-08-08 15:23:48 -04:00
parent 06b192c458
commit 7e7d245b33
1 changed files with 5 additions and 10 deletions
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15
src/hb-common.cc
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@ -238,17 +238,12 @@ hb_language_to_string (hb_language_t language)
hb_language_t
hb_language_get_default (void)
{
static hb_language_t default_language;
static hb_language_t default_language = HB_LANGUAGE_INVALID;
if (!default_language) {
/* This block is not quite threadsafe, but is not as bad as
* it looks since it's idempotent. As long as pointer ops
* are atomic, we are safe. */
/* I hear that setlocale() doesn't honor env vars on Windows,
* but for now we ignore that. */
default_language = hb_language_from_string (setlocale (LC_CTYPE, NULL), -1);
hb_language_t language = (hb_language_t) hb_atomic_ptr_get (&default_language);
if (unlikely (language == HB_LANGUAGE_INVALID)) {
language = hb_language_from_string (setlocale (LC_CTYPE, NULL), -1);
hb_atomic_ptr_cmpexch (&default_language, HB_LANGUAGE_INVALID, language);
}
return default_language;