[src/trunk]: src/sys/sys Define macros for the time conversion magic numbers.

[pgoyette <pgoyette%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/8727a7534115
branches:  trunk
changeset: 820285:8727a7534115
user:      pgoyette <pgoyette%NetBSD.org@localhost>
date:      Thu Jan 05 23:24:39 2017 +0000

description:
Define macros for the time conversion magic numbers.

diffstat:

 sys/sys/time.h |  27 ++++++++++++++++-----------
 1 files changed, 16 insertions(+), 11 deletions(-)

diffs (78 lines):

diff -r 048aacd19c7b -r 8727a7534115 sys/sys/time.h
--- a/sys/sys/time.h    Thu Jan 05 23:15:43 2017 +0000
+++ b/sys/sys/time.h    Thu Jan 05 23:24:39 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: time.h,v 1.75 2017/01/05 22:51:15 pgoyette Exp $       */
+/*     $NetBSD: time.h,v 1.76 2017/01/05 23:24:39 pgoyette Exp $       */
 
 /*
  * Copyright (c) 1982, 1986, 1993
@@ -159,13 +159,18 @@
  */
 
 /*
- * The magic numbers for converting to fraction:
- *
- *     1 ms = int(2^64 / 1000)       =  18446744073709551
- *     1 us = int(2^64 / 1000000)    =     18446744073709
- *     1 ns = int(2^64 / 1000000000) =        18446744073
+ * The magic numbers for converting ms/us/ns to fractions
  */
 
+/* 1ms = (2^64) / 1000       */
+#define        BINTIME_SCALE_MS        ((uint64_t)18446744073709551ULL)
+
+/* 1us = (2^64) / 1000000    */
+#define        BINTIME_SCALE_US        ((uint64_t)18446744073709ULL)
+
+/* 1ns = (2^64) / 1000000000 */
+#define        BINTIME_SCALE_NS        ((uint64_t)18446744073ULL)
+
 static __inline void
 bintime2timespec(const struct bintime *bt, struct timespec *ts)
 {
@@ -180,7 +185,7 @@
 {
 
        bt->sec = ts->tv_sec;
-       bt->frac = (uint64_t)ts->tv_nsec * (uint64_t)18446744073ULL;
+       bt->frac = (uint64_t)ts->tv_nsec * (uint64_t)BINTIME_SCALE_NS;
 }
 
 static __inline void
@@ -197,7 +202,7 @@
 {
 
        bt->sec = tv->tv_sec;
-       bt->frac = (uint64_t)tv->tv_usec * (uint64_t)18446744073709ULL;
+       bt->frac = (uint64_t)tv->tv_usec * (uint64_t)BINTIME_SCALE_US;
 }
 
 static __inline struct bintime
@@ -206,7 +211,7 @@
        struct bintime bt;
 
        bt.sec = (time_t)(ms / 1000U);
-       bt.frac = (uint64_t)(ms % 1000U) * (uint64_t)18446744073709551ULL;
+       bt.frac = (uint64_t)(ms % 1000U) * (uint64_t)BINTIME_SCALE_MS;
 
        return bt;
 }
@@ -217,7 +222,7 @@
        struct bintime bt;
 
        bt.sec = (time_t)(us / 1000000U);
-       bt.frac = (uint64_t)(us % 1000000U) * (uint64_t)18446744073709ULL;
+       bt.frac = (uint64_t)(us % 1000000U) * (uint64_t)BINTIME_SCALE_US;
 
        return bt;
 }
@@ -228,7 +233,7 @@
        struct bintime bt;
 
        bt.sec = (time_t)(ns / 1000000000U);
-       bt.frac = (uint64_t)(ns % 1000000000U) * (uint64_t)18446744073ULL;
+       bt.frac = (uint64_t)(ns % 1000000000U) * (uint64_t)BINTIME_SCALE_NS;
 
        return bt;
 }