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 30 class 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 void finish_log(); 45 void finish_log_on_error(char *buf, int buflen); 46 public: 47 // must defer time stamp due to the fact that os::init() hasn't 48 // yet been called and os::elapsed_counter() may not be valid 49 defaultStream() { 50 _log_file = NULL; 51 _inited = false; 52 _writer = -1; 53 _last_writer = -1; 54 } 55 56 ~defaultStream() { 57 if (has_log_file()) finish_log(); 58 } 59 60 static inline FILE* output_stream() { 61 return DisplayVMOutputToStderr ? _error_stream : _output_stream; 62 } 63 static inline FILE* error_stream() { 64 return DisplayVMOutputToStdout ? _output_stream : _error_stream; 65 } 66 static inline int output_fd() { 67 return DisplayVMOutputToStderr ? _error_fd : _output_fd; 68 } 69 static inline int error_fd() { 70 return DisplayVMOutputToStdout ? _output_fd : _error_fd; 71 } 72 73 virtual void write(const char* s, size_t len); 74 75 void flush() { 76 // once we can determine whether we are in a signal handler, we 77 // should add the following assert here: 78 // assert(xxxxxx, "can not flush buffer inside signal handler"); 79 xmlTextStream::flush(); 80 fflush(output_stream()); 81 if (has_log_file()) _log_file->flush(); 82 } 83 84 // advisory lock/unlock of _writer field: 85 private: 86 intx _writer; // thread_id with current rights to output 87 intx _last_writer; 88 public: 89 intx hold(intx writer_id); 90 void release(intx holder); 91 intx writer() { return _writer; } 92 bool has_log_file(); 93 94 static defaultStream* instance; // sole instance 95 }; 96 97 #endif // SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP