[ruby/fiddle] Add MemoryView.export and MemoryView#release (https://github.com/ruby/fiddle/pull/80)

fix https://github.com/ruby/fiddle/pull/79

Users can release memory views explicitly before process exit.

Reported by xtkoba. Thanks!!!

https://github.com/ruby/fiddle/commit/1de64b7e76

1 files changed, 16 insertions, 0 deletions

diff --git a/test/fiddle/test_memory_view.rb b/test/fiddle/test_memory_view.rb
index 6777a043ce..8130823fd6 100644
--- a/test/fiddle/test_memory_view.rb
+++ b/test/fiddle/test_memory_view.rb
@@ -114,6 +114,22 @@ module Fiddle
       assert_equal([-7, -8], mview[1, 3])
     end
 
+    def test_export
+      str = "hello world"
+      mview_str = MemoryView.export(Pointer[str]) do |mview|
+        mview.to_s
+      end
+      assert_equal(str, mview_str)
+    end
+
+    def test_release
+      ptr = Pointer["hello world"]
+      mview = MemoryView.new(ptr)
+      assert_same(ptr, mview.obj)
+      mview.release
+      assert_nil(mview.obj)
+    end
+
     def test_to_s
       # U+3042 HIRAGANA LETTER A
       data = "\u{3042}"