1/*
2 * Copyright (c) 2003, 2019, 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_UTILITIES_DEFAULTSTREAM_HPP
26#define SHARE_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_UTILITIES_DEFAULTSTREAM_HPP
100