[atomic] Add get_relaxed / set_relaxed
To help TSan and be more "correct".
diff --git a/src/hb-debug.hh b/src/hb-debug.hh
index ae0b677..9056ffc 100644
--- a/src/hb-debug.hh
+++ b/src/hb-debug.hh
@@ -28,6 +28,7 @@
#define HB_DEBUG_HH
#include "hb-private.hh"
+#include "hb-atomic-private.hh"
#include "hb-dsalgs.hh"
@@ -35,6 +36,47 @@
#define HB_DEBUG 0
#endif
+
+/*
+ * Global runtime options.
+ */
+
+struct hb_options_t
+{
+ unsigned int unused : 1; /* In-case sign bit is here. */
+ unsigned int initialized : 1;
+ unsigned int uniscribe_bug_compatible : 1;
+};
+
+union hb_options_union_t {
+ int i;
+ hb_options_t opts;
+};
+static_assert ((sizeof (hb_atomic_int_t) >= sizeof (hb_options_union_t)), "");
+
+HB_INTERNAL void
+_hb_options_init (void);
+
+extern HB_INTERNAL hb_atomic_int_t _hb_options;
+
+static inline hb_options_t
+hb_options (void)
+{
+ /* Make a local copy, so we can access bitfield threadsafely. */
+ hb_options_union_t u;
+ u.i = _hb_options.get_relaxed ();
+
+ if (unlikely (!u.i))
+ _hb_options_init ();
+
+ return u.opts;
+}
+
+
+/*
+ * Debug output (needs enabling at compile time.)
+ */
+
static inline bool
_hb_debug (unsigned int level,
unsigned int max_level)
