* io.c (fptr_finalize): must not use FILE after fclose().

[ruby-dev:24985]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@7411 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/io/nonblock/test_flush.rb

@@ -0,0 +1,22 @@
+require 'test/unit'
+require 'io/nonblock'
+
+class TestIONonblock < Test::Unit::TestCase
+  def test_flush                # [ruby-dev:24985]
+    r,w = IO.pipe
+    w.nonblock = true
+    w.sync = false
+    w << "b"
+    w.flush
+    w << "a" * 4096
+    Thread.new {
+      Thread.pass
+      w.close
+    }
+    Thread.new {
+      Thread.pass
+      nil while r.read(4096)
+    }
+    assert_raise(IOError) {w.flush}
+  end
+end