* thread.c (timeofday): use monotonic clock. based on a patch

  from zimbatm <zimbatm@oree.ch> in [ruby-core:16627].

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@16338 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 12 insertions, 3 deletions

diff --git a/thread.c b/thread.c
index f7a4b8ba7..21d43edc2 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