* thread.c (rb_thread_schedule_limits): minor optimization.

  eliminate machine context saving when running time is enough small.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32303 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 8 deletions

diff --git a/thread.c b/thread.c
index 31b9d4fb68..0e10768129 100644
--- a/thread.c
+++ b/thread.c
@@ -1008,15 +1008,13 @@ rb_thread_schedule_limits(unsigned long limits_us)
     if (!rb_thread_alone()) {
 	rb_thread_t *th = GET_THREAD();
 
-	thread_debug("rb_thread_schedule/switch start\n");
-
-	RB_GC_SAVE_MACHINE_CONTEXT(th);
-
-	if (th->running_time_us >= limits_us)
+	if (th->running_time_us >= limits_us) {
+	    thread_debug("rb_thread_schedule/switch start\n");
+	    RB_GC_SAVE_MACHINE_CONTEXT(th);
 	    gvl_yield(th->vm, th);
-
-	rb_thread_set_current(th);
-	thread_debug("rb_thread_schedule/switch done\n");
+	    rb_thread_set_current(th);
+	    thread_debug("rb_thread_schedule/switch done\n");
+	}
     }
 }