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[uniscribe] Use lazy loader 

Fixes https://github.com/harfbuzz/harfbuzz/issues/1129
This commit is contained in:
Behdad Esfahbod 2018-08-12 18:20:53 -07:00
parent 2663689936
commit 9bbd1cdf06
1 changed files with 34 additions and 32 deletions
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66
src/hb-uniscribe.cc
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@ -221,47 +221,49 @@ struct hb_uniscribe_shaper_funcs_t
} }
} }
}; };
static hb_atomic_ptr_t<hb_uniscribe_shaper_funcs_t> uniscribe_funcs;
static void free_static_uniscribe_shaper_funcs (void);
static struct hb_uniscribe_shaper_funcs_lazy_loader_t : hb_lazy_loader_t<hb_uniscribe_shaper_funcs_t,
hb_uniscribe_shaper_funcs_lazy_loader_t>
{
static inline hb_uniscribe_shaper_funcs_t *create (void)
{
hb_uniscribe_shaper_funcs_t *funcs = (hb_uniscribe_shaper_funcs_t *) calloc (1, sizeof (hb_uniscribe_shaper_funcs_t));
if (unlikely (!funcs))
return nullptr;
funcs->init ();
#ifdef HB_USE_ATEXIT #ifdef HB_USE_ATEXIT
static inline void atexit (free_static_uniscribe_shaper_funcs);
free_uniscribe_funcs (void) #endif
{
retry:
hb_uniscribe_shaper_funcs_t *local_uniscribe_funcs = uniscribe_funcs.get ();
if (unlikely (!uniscribe_funcs.cmpexch (local_uniscribe_funcs, nullptr)))
goto retry;
free (local_uniscribe_funcs); return funcs;
}
static inline void destroy (hb_uniscribe_shaper_funcs_t *p)
{
free ((void *) p);
}
static inline hb_uniscribe_shaper_funcs_t *get_null (void)
{
return nullptr;
}
} static_uniscribe_shaper_funcs;
#ifdef HB_USE_ATEXIT
static
void free_static_uniscribe_shaper_funcs (void)
{
static_uniscribe_shaper_funcs.free_instance ();
} }
#endif #endif
static hb_uniscribe_shaper_funcs_t * static hb_uniscribe_shaper_funcs_t *
hb_uniscribe_shaper_get_funcs (void) hb_uniscribe_shaper_get_funcs (void)
{ {
retry: return static_uniscribe_shaper_funcs.get_unconst ();
hb_uniscribe_shaper_funcs_t *funcs = uniscribe_funcs.get ();
if (unlikely (!funcs))
{
funcs = (hb_uniscribe_shaper_funcs_t *) calloc (1, sizeof (hb_uniscribe_shaper_funcs_t));
if (unlikely (!funcs))
return nullptr;
funcs->init ();
if (unlikely (!uniscribe_funcs.cmpexch (nullptr, funcs)))
{
free (funcs);
goto retry;
}
#ifdef HB_USE_ATEXIT
atexit (free_uniscribe_funcs); /* First person registers atexit() callback. */
#endif
}
return funcs;
} }