io.c: get rid of race condition

* io.c (rb_io_close_write): detach tied IO for writing before closing
  to get rid of race condition.  [ruby-list:49598]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43114 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/io.c b/io.c
index 053d34f931..15fc799d69 100644
--- a/io.c
+++ b/io.c
@@ -4492,12 +4492,12 @@ rb_io_close_write(VALUE io)
 	rb_raise(rb_eIOError, "closing non-duplex IO for writing");
     }
 
-    rb_io_close(write_io);
     if (io != write_io) {
 	GetOpenFile(io, fptr);
 	fptr->tied_io_for_writing = 0;
 	fptr->mode &= ~FMODE_DUPLEX;
     }
+    rb_io_close(write_io);
     return Qnil;
 }