1/*
2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#ifndef SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP
26#define SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP
27
28#include "utilities/xmlstream.hpp"
29
30class defaultStream : public xmlTextStream {
31  friend void ostream_abort();
32 public:
33  enum { NO_WRITER = -1 };
34 private:
35  bool         _inited;
36  fileStream*  _log_file;  // XML-formatted file shared by all threads
37  static int   _output_fd;
38  static int   _error_fd;
39  static FILE* _output_stream;
40  static FILE* _error_stream;
41
42  void init();
43  void init_log();
44  fileStream* open_file(const char* log_name);
45  void start_log();
46  void finish_log();
47  void finish_log_on_error(char *buf, int buflen);
48 public:
49  // must defer time stamp due to the fact that os::init() hasn't
50  // yet been called and os::elapsed_counter() may not be valid
51  defaultStream() {
52    _log_file = NULL;
53    _inited = false;
54    _writer = -1;
55    _last_writer = -1;
56  }
57
58  ~defaultStream() {
59    if (has_log_file())  finish_log();
60  }
61
62  static inline FILE* output_stream() {
63    return DisplayVMOutputToStderr ? _error_stream : _output_stream;
64  }
65  static inline FILE* error_stream() {
66    return DisplayVMOutputToStdout ? _output_stream : _error_stream;
67  }
68  static inline int output_fd() {
69    return DisplayVMOutputToStderr ? _error_fd : _output_fd;
70  }
71  static inline int error_fd() {
72    return DisplayVMOutputToStdout ? _output_fd : _error_fd;
73  }
74
75  virtual void write(const char* s, size_t len);
76
77  void flush() {
78    // once we can determine whether we are in a signal handler, we
79    // should add the following assert here:
80    // assert(xxxxxx, "can not flush buffer inside signal handler");
81    xmlTextStream::flush();
82    fflush(output_stream());
83    if (has_log_file()) _log_file->flush();
84  }
85
86  // advisory lock/unlock of _writer field:
87 private:
88  intx _writer;    // thread_id with current rights to output
89  intx _last_writer;
90 public:
91  intx hold(intx writer_id);
92  void release(intx holder);
93  intx writer() { return _writer; }
94  bool has_log_file();
95
96  static defaultStream* instance;  // sole instance
97};
98
99#endif // SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP
100