From f09058b877c41ba05cec24641ae84425f7ac356f Mon Sep 17 00:00:00 2001
From: ko1 <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 6 Dec 2013 10:09:38 +0000
Subject: [PATCH] * gc.c (atomic_sub_nounderflow): not 0 but val itself.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44039 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog | 4 ++++
 gc.c      | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 1c0a84c9cf..98be0f3217 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Dec  6 19:08:48 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c (atomic_sub_nounderflow): not 0 but val itself.
+
 Fri Dec  6 18:37:11 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* gc.c (rb_objspace_alloc, Init_heap): initialize
diff --git a/gc.c b/gc.c
index ac17d03f81..f6940b0419 100644
--- a/gc.c
+++ b/gc.c
@@ -5816,7 +5816,7 @@ atomic_sub_nounderflow(size_t *var, size_t sub)
 
     while (1) {
 	size_t val = *var;
-	if (val < sub) sub = 0;
+	if (val < sub) sub = val;
 	if (ATOMIC_SIZE_CAS(*var, val, val-sub) == val) break;
     }
 }