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