defaultStream.hpp revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 2003, 2004, 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
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23 */
24
25class defaultStream : public xmlTextStream {
26  friend void ostream_abort();
27 public:
28  enum { NO_WRITER = -1 };
29 private:
30  bool         _inited;
31  fileStream*  _log_file;  // XML-formatted file shared by all threads
32  static int   _output_fd;
33  static int   _error_fd;
34  static FILE* _output_stream;
35  static FILE* _error_stream;
36
37  void init();
38  void init_log();
39  void finish_log();
40  void finish_log_on_error(char *buf, int buflen);
41 public:
42  // must defer time stamp due to the fact that os::init() hasn't
43  // yet been called and os::elapsed_counter() may not be valid
44  defaultStream() {
45    _log_file = NULL;
46    _inited = false;
47    _writer = -1;
48    _last_writer = -1;
49  }
50
51  ~defaultStream() {
52    if (has_log_file())  finish_log();
53  }
54
55  static inline FILE* output_stream() {
56    return DisplayVMOutputToStderr ? _error_stream : _output_stream;
57  }
58  static inline FILE* error_stream() {
59    return DisplayVMOutputToStdout ? _output_stream : _error_stream;
60  }
61  static inline int output_fd() {
62    return DisplayVMOutputToStderr ? _error_fd : _output_fd;
63  }
64  static inline int error_fd() {
65    return DisplayVMOutputToStdout ? _output_fd : _error_fd;
66  }
67
68  virtual void write(const char* s, size_t len);
69
70  void flush() {
71    // once we can determine whether we are in a signal handler, we
72    // should add the following assert here:
73    // assert(xxxxxx, "can not flush buffer inside signal handler");
74    xmlTextStream::flush();
75    fflush(output_stream());
76    if (has_log_file()) _log_file->flush();
77  }
78
79  // advisory lock/unlock of _writer field:
80 private:
81  intx _writer;    // thread_id with current rights to output
82  intx _last_writer;
83 public:
84  intx hold(intx writer_id);
85  void release(intx holder);
86  intx writer() { return _writer; }
87  bool has_log_file();
88
89  static defaultStream* instance;  // sole instance
90};
91