From 0f1baad5a38d279cc03ff9a5a83dca12b9fb26a6 Mon Sep 17 00:00:00 2001
From: matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 9 May 2008 10:17:15 +0000
Subject: * thread.c (timeofday): use monotonic clock.  based on a patch   from
 zimbatm <zimbatm@oree.ch> in [ruby-core:16627].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@16338 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 thread.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

(limited to 'thread.c')

diff --git a/thread.c b/thread.c
index f7a4b8ba7a..21d43edc27 100644
--- a/thread.c
+++ b/thread.c
@@ -674,9 +674,18 @@ rb_thread_sleep_forever()
 static double
 timeofday(void)
 {
-    struct timeval tv;
-    gettimeofday(&tv, NULL);
-    return (double)tv.tv_sec + (double)tv.tv_usec * 1e-6;
+#if defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_MONOTONIC)
+    struct timespec tp;
+
+    if (clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
+        return (double)tp.tv_sec + (double)tp.tv_nsec * 1e-9;
+    } else
+#endif
+    {
+        struct timeval tv;
+        gettimeofday(&tv, NULL);
+        return (double)tv.tv_sec + (double)tv.tv_usec * 1e-6;
+    }
 }
 
 static void
-- 
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