From 5e95f11756c13f730f9bc095f42a444f46f6b8b3 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Wed, 3 Mar 2021 09:53:11 +0900
Subject: time.c: use `clock_gettime()` if possible.

---
 mrbgems/mruby-time/src/time.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/mrbgems/mruby-time/src/time.c b/mrbgems/mruby-time/src/time.c
index 5093a73ce..50d618fc3 100644
--- a/mrbgems/mruby-time/src/time.c
+++ b/mrbgems/mruby-time/src/time.c
@@ -21,6 +21,7 @@
 #endif
 
 #include <stdlib.h>
+#include <unistd.h>
 
 #define NDIV(x,y) (-(-((x)+1)/(y))-1)
 #define TO_S_FMT "%Y-%m-%d %H:%M:%S "
@@ -382,6 +383,13 @@ current_mrb_time(mrb_state *mrb)
     sec = ts.tv_sec;
     usec = ts.tv_nsec / 1000;
   }
+#elif (defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0) && defined(_POSIX_MONOTONIC_CLOCK)
+  {
+    struct timespec ts;
+    clock_gettime(CLOCK_MONOTONIC, &ts);
+    sec = ts.tv_sec;
+    usec = ts.tv_nsec / 1000;
+  }
 #elif defined(NO_GETTIMEOFDAY)
   {
     static time_t last_sec = 0, last_usec = 0;
-- 
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