duke@435: /*
stefank@2314:  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP
stefank@2314: #define SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP
stefank@2314: 
stefank@2314: #include "utilities/xmlstream.hpp"
stefank@2314: 
duke@435: class defaultStream : public xmlTextStream {
duke@435:   friend void ostream_abort();
duke@435:  public:
duke@435:   enum { NO_WRITER = -1 };
duke@435:  private:
duke@435:   bool         _inited;
duke@435:   fileStream*  _log_file;  // XML-formatted file shared by all threads
duke@435:   static int   _output_fd;
duke@435:   static int   _error_fd;
duke@435:   static FILE* _output_stream;
duke@435:   static FILE* _error_stream;
duke@435: 
duke@435:   void init();
duke@435:   void init_log();
duke@435:   void finish_log();
duke@435:   void finish_log_on_error(char *buf, int buflen);
duke@435:  public:
duke@435:   // must defer time stamp due to the fact that os::init() hasn't
duke@435:   // yet been called and os::elapsed_counter() may not be valid
duke@435:   defaultStream() {
duke@435:     _log_file = NULL;
duke@435:     _inited = false;
duke@435:     _writer = -1;
duke@435:     _last_writer = -1;
duke@435:   }
duke@435: 
duke@435:   ~defaultStream() {
duke@435:     if (has_log_file())  finish_log();
duke@435:   }
duke@435: 
duke@435:   static inline FILE* output_stream() {
duke@435:     return DisplayVMOutputToStderr ? _error_stream : _output_stream;
duke@435:   }
duke@435:   static inline FILE* error_stream() {
duke@435:     return DisplayVMOutputToStdout ? _output_stream : _error_stream;
duke@435:   }
duke@435:   static inline int output_fd() {
duke@435:     return DisplayVMOutputToStderr ? _error_fd : _output_fd;
duke@435:   }
duke@435:   static inline int error_fd() {
duke@435:     return DisplayVMOutputToStdout ? _output_fd : _error_fd;
duke@435:   }
duke@435: 
duke@435:   virtual void write(const char* s, size_t len);
duke@435: 
duke@435:   void flush() {
duke@435:     // once we can determine whether we are in a signal handler, we
duke@435:     // should add the following assert here:
duke@435:     // assert(xxxxxx, "can not flush buffer inside signal handler");
duke@435:     xmlTextStream::flush();
duke@435:     fflush(output_stream());
duke@435:     if (has_log_file()) _log_file->flush();
duke@435:   }
duke@435: 
duke@435:   // advisory lock/unlock of _writer field:
duke@435:  private:
duke@435:   intx _writer;    // thread_id with current rights to output
duke@435:   intx _last_writer;
duke@435:  public:
duke@435:   intx hold(intx writer_id);
duke@435:   void release(intx holder);
duke@435:   intx writer() { return _writer; }
duke@435:   bool has_log_file();
duke@435: 
duke@435:   static defaultStream* instance;  // sole instance
duke@435: };
stefank@2314: 
stefank@2314: #endif // SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP