#include "hb-private.hh"
#include "hb-shaper-private.hh"
-#include "hb-atomic-private.hh"
+#include "hb-machinery-private.hh"
static const hb_shaper_pair_t all_shapers[] = {
};
-/* Thread-safe, lock-free, shapers */
+static void free_static_shapers (void);
-static hb_atomic_ptr_t<const hb_shaper_pair_t> static_shapers;
-
-#ifdef HB_USE_ATEXIT
-static
-void free_static_shapers (void)
+static struct hb_shapers_lazy_loader_t : hb_lazy_loader_t<const hb_shaper_pair_t,
+ hb_shapers_lazy_loader_t>
{
-retry:
- const hb_shaper_pair_t *shapers = static_shapers.get ();
- if (unlikely (!static_shapers.cmpexch (shapers, nullptr)))
- goto retry;
-
- if (unlikely (shapers != all_shapers))
- free ((void *) shapers);
-}
-#endif
-
-const hb_shaper_pair_t *
-_hb_shapers_get (void)
-{
-retry:
- hb_shaper_pair_t *shapers = const_cast<hb_shaper_pair_t *> (static_shapers.get ());
-
- if (unlikely (!shapers))
+ static inline hb_shaper_pair_t *create (void)
{
char *env = getenv ("HB_SHAPER_LIST");
- if (!env || !*env) {
- (void) static_shapers.cmpexch (nullptr, &all_shapers[0]);
- return (const hb_shaper_pair_t *) all_shapers;
- }
+ if (!env || !*env)
+ return nullptr;
- /* Not found; allocate one. */
- shapers = (hb_shaper_pair_t *) calloc (1, sizeof (all_shapers));
+ hb_shaper_pair_t *shapers = (hb_shaper_pair_t *) calloc (1, sizeof (all_shapers));
if (unlikely (!shapers))
- {
- (void) static_shapers.cmpexch (nullptr, &all_shapers[0]);
- return (const hb_shaper_pair_t *) all_shapers;
- }
+ return nullptr;
memcpy (shapers, all_shapers, sizeof (all_shapers));
/* Reorder shaper list to prefer requested shapers. */
unsigned int i = 0;
char *end, *p = env;
- for (;;) {
+ for (;;)
+ {
end = strchr (p, ',');
if (!end)
end = p + strlen (p);
p = end + 1;
}
- if (unlikely (!static_shapers.cmpexch (nullptr, shapers)))
- {
- free (shapers);
- goto retry;
- }
-
#ifdef HB_USE_ATEXIT
- atexit (free_static_shapers); /* First person registers atexit() callback. */
+ atexit (free_static_shapers);
#endif
+
+ return shapers;
+ }
+ static inline void destroy (const hb_shaper_pair_t *p)
+ {
+ free ((void *) p);
}
+ static inline const hb_shaper_pair_t *get_null (void)
+ {
+ return all_shapers;
+ }
+} static_shapers;
- return shapers;
+#ifdef HB_USE_ATEXIT
+static
+void free_static_shapers (void)
+{
+ static_shapers.free_instance ();
+}
+#endif
+
+const hb_shaper_pair_t *
+_hb_shapers_get (void)
+{
+ return static_shapers.get_unconst ();
}