From 04adefafdf060ab85604d6481afc364f60855974 Mon Sep 17 00:00:00 2001
From: John Barboza <jbarboza@ca.ibm.com>
Date: Wed, 2 Aug 2017 19:41:13 -0400
Subject: [PATCH] zos: fix hr timer resolution
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

One tick on the high resolution clock (TOD clock) on z/OS
is equivalent to (1/4.096) nanoseconds.

PR-URL: https://github.com/libuv/libuv/pull/1453
Reviewed-By: Colin Ihrig <cjihrig@gmail.com
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
---
 src/unix/os390.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/unix/os390.c b/src/unix/os390.c
index de7df911..e0a70024 100644
--- a/src/unix/os390.c
+++ b/src/unix/os390.c
@@ -77,6 +77,9 @@
 #pragma linkage(BPX4GTH, OS)
 #pragma linkage(BPX1GTH, OS)
 
+/* TOD Clock resolution in nanoseconds */
+#define TOD_RES 4.096
+
 typedef unsigned data_area_ptr_assign_type;
 
 typedef union {
@@ -122,7 +125,7 @@ uint64_t uv__hrtime(uv_clocktype_t type) {
   unsigned long long timestamp;
   __stckf(&timestamp);
   /* Convert to nanoseconds */
-  return timestamp / 10;
+  return timestamp / TOD_RES;
 }