* gc.c (gc_start): force to invoke GC by GC.start

even if it is GC.disable'd.

* test/ruby/test_gc.rb: add a test.




git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52672 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,10 @@
+Thu Nov 19 21:55:11 2015  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c (gc_start): force to invoke GC by GC.start
+	  even if it is GC.disable'd.
+
+	* test/ruby/test_gc.rb: add a test.
+
 Thu Nov 19 20:08:59 2015  Koichi Sasada  <ko1@atdot.net>
 
 	* gc.c: trivial performance improvements.

gc.c

@@ -6158,8 +6158,8 @@ gc_start(rb_objspace_t *objspace, const int full_mark, const int immediate_mark,
     int do_full_mark = full_mark;
     objspace->flags.immediate_sweep = immediate_sweep;
 
-    if (!heap_allocated_pages) return FALSE;      /* heap is not ready */
-    if (!ready_to_gc(objspace)) return TRUE; /* GC is not allowed */
+    if (!heap_allocated_pages) return FALSE; /* heap is not ready */
+    if (reason != GPR_FLAG_METHOD && !ready_to_gc(objspace)) return TRUE; /* GC is not allowed */
 
     if (RGENGC_CHECK_MODE) {
 	assert(objspace->flags.stat == gc_stat_none);

test/ruby/test_gc.rb

@@ -385,4 +385,15 @@ class TestGc < Test::Unit::TestCase
       C.new
     end;
   end
+
+  def test_gc_disabled_start
+    begin
+      disabled = GC.disable
+      c = GC.count
+      GC.start
+      assert_equal 1, GC.count - c
+    ensure
+      GC.enable unless disabled
+    end
+  end
 end