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 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 defaultStream()51 defaultStream() { 52 _log_file = NULL; 53 _inited = false; 54 _writer = -1; 55 _last_writer = -1; 56 } 57 ~defaultStream()58 ~defaultStream() { 59 if (has_log_file()) finish_log(); 60 } 61 output_stream()62 static inline FILE* output_stream() { 63 return DisplayVMOutputToStderr ? _error_stream : _output_stream; 64 } error_stream()65 static inline FILE* error_stream() { 66 return DisplayVMOutputToStdout ? _output_stream : _error_stream; 67 } output_fd()68 static inline int output_fd() { 69 return DisplayVMOutputToStderr ? _error_fd : _output_fd; 70 } error_fd()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 flush()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); writer()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