define fixed point arithmetic constants

src/threads/fixed-point.h

@@ -0,0 +1,9 @@
+#ifndef FIXED_POINT_H
+#define FIXED_POINT_H
+
+/* Fixed Point Arithmetic bit count constants */
+#define NUM_INT_BITS 11
+#define NUM_FRAC_BITS 20
+#define CONVERSION_CONST 1048576 /* f = 2^q, (2^20) */
+
+#endif //FIXED_POINT_H