diff -r 000000000000 -r f90c822e73f8 src/share/vm/utilities/defaultStream.hpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/utilities/defaultStream.hpp	Wed Apr 27 01:25:04 2016 +0800
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP
+#define SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP
+
+#include "utilities/xmlstream.hpp"
+
+class defaultStream : public xmlTextStream {
+  friend void ostream_abort();
+ public:
+  enum { NO_WRITER = -1 };
+ private:
+  bool         _inited;
+  fileStream*  _log_file;  // XML-formatted file shared by all threads
+  static int   _output_fd;
+  static int   _error_fd;
+  static FILE* _output_stream;
+  static FILE* _error_stream;
+
+  void init();
+  void init_log();
+  void finish_log();
+  void finish_log_on_error(char *buf, int buflen);
+ public:
+  // must defer time stamp due to the fact that os::init() hasn't
+  // yet been called and os::elapsed_counter() may not be valid
+  defaultStream() {
+    _log_file = NULL;
+    _inited = false;
+    _writer = -1;
+    _last_writer = -1;
+  }
+
+  ~defaultStream() {
+    if (has_log_file())  finish_log();
+  }
+
+  static inline FILE* output_stream() {
+    return DisplayVMOutputToStderr ? _error_stream : _output_stream;
+  }
+  static inline FILE* error_stream() {
+    return DisplayVMOutputToStdout ? _output_stream : _error_stream;
+  }
+  static inline int output_fd() {
+    return DisplayVMOutputToStderr ? _error_fd : _output_fd;
+  }
+  static inline int error_fd() {
+    return DisplayVMOutputToStdout ? _output_fd : _error_fd;
+  }
+
+  virtual void write(const char* s, size_t len);
+
+  void flush() {
+    // once we can determine whether we are in a signal handler, we
+    // should add the following assert here:
+    // assert(xxxxxx, "can not flush buffer inside signal handler");
+    xmlTextStream::flush();
+    fflush(output_stream());
+    if (has_log_file()) _log_file->flush();
+  }
+
+  // advisory lock/unlock of _writer field:
+ private:
+  intx _writer;    // thread_id with current rights to output
+  intx _last_writer;
+ public:
+  intx hold(intx writer_id);
+  void release(intx holder);
+  intx writer() { return _writer; }
+  bool has_log_file();
+
+  static defaultStream* instance;  // sole instance
+};
+
+#endif // SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP