Report time with a nanosecond precision where available

Issue #258 (bdwgc).

* alloc.c [!NO_CLOCK] (GC_time_lim_nsec): Update comment.
* alloc.c [!NO_CLOCK && !GC_DISABLE_INCREMENTAL]
(GC_timeout_stop_func): Declare nsec_diff local variable; use
GC_time_lim_nsec.
* alloc.c [!NO_CLOCK && !GC_DISABLE_INCREMENTAL]
(GC_timeout_stop_func): Use NS_FRAC_TIME_DIFF(); print "ns" value after
"ms" one.
* alloc.c [!NO_CLOCK] (GC_try_to_collect_inner, GC_stopped_mark,
GC_finish_collection): Likewise.
* reclaim.c [!NO_CLOCK] (GC_reclaim_all): Likewise.
* include/private/gc_priv.h [!NO_CLOCK && BSD_TIME] (MS_TIME_DIFF):
Always round the result of division toward minus infinity.
* include/private/gc_priv.h [!NO_CLOCK] (NS_FRAC_TIME_DIFF): New macro.

1 files changed, 4 insertions, 2 deletions

diff --git a/reclaim.c b/reclaim.c
index 73292b4f..3a573832 100644
--- a/reclaim.c
+++ b/reclaim.c
@@ -755,8 +755,10 @@ GC_INNER GC_bool GC_reclaim_all(GC_stop_func stop_func, GC_bool ignore_old)
         CLOCK_TYPE done_time;
 
         GET_TIME(done_time);
-        GC_verbose_log_printf("Disposing of reclaim lists took %lu ms\n",
-                              MS_TIME_DIFF(done_time,start_time));
+        GC_verbose_log_printf(
+                        "Disposing of reclaim lists took %lu ms %lu ns\n",
+                        MS_TIME_DIFF(done_time, start_time),
+                        NS_FRAC_TIME_DIFF(done_time, start_time));
       }
 #   endif
     return(TRUE);