call C11's timespec_get()

gettimeofday() is an obsolescent POSIX function which may be removed in
a future version. POSIX recommends using clock_gettime() (also POSIX)
instead, but it isn't available on OS X or Windows (at least with MSVC
and older MinGW versions).

Whereas timespec_get() is part of ISO C11 and mruby uses some small
other C11 features too. It isn't universally available yet either, but
it might be in the future. And Visual C++ 2015 implements it! Since
mruby strives for ISO C and not POSIX compatibility, I think it's a
reasonable choice.

TIME_UTC is used instead of __STDC_VERSION__, because if TIME_UTC is
defined, then most likely timespec_get() is too. This isn't true in case
of  __STDC_VERSION__ (see MSVC).

1 files changed, 11 insertions, 1 deletions

diff --git a/mrbgems/mruby-time/src/time.c b/mrbgems/mruby-time/src/time.c
index 36cf0a732..b377f3e33 100644
--- a/mrbgems/mruby-time/src/time.c
+++ b/mrbgems/mruby-time/src/time.c
@@ -235,7 +235,17 @@ current_mrb_time(mrb_state *mrb)
   struct mrb_time *tm;
 
   tm = (struct mrb_time *)mrb_malloc(mrb, sizeof(*tm));
-#ifdef NO_GETTIMEOFDAY
+#if defined(TIME_UTC)
+  {
+    struct timespec ts;
+    if (timespec_get(&ts, TIME_UTC) == 0) {
+      mrb_free(mrb, tm);
+      mrb_raise(mrb, E_RUNTIME_ERROR, "timespec_get() failed for unknown reasons");
+    }
+    tm->sec = ts.tv_sec;
+    tm->usec = ts.tv_nsec / 1000;
+  }
+#elif defined(NO_GETTIMEOFDAY)
   {
     static time_t last_sec = 0, last_usec = 0;