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view src/share/vm/utilities/defaultStream.hpp @ 10405:f2110083203d
8005849: JEP 167: Event-Based JVM Tracing
Reviewed-by: acorn, coleenp, sla
Contributed-by: Karen Kinnear <karen.kinnear@oracle.com>, Bengt Rutisson <bengt.rutisson@oracle.com>, Calvin Cheung <calvin.cheung@oracle.com>, Erik Gahlin <erik.gahlin@oracle.com>, Erik Helin <erik.helin@oracle.com>, Jesper Wilhelmsson <jesper.wilhelmsson@oracle.com>, Keith McGuigan <keith.mcguigan@oracle.com>, Mattias Tobiasson <mattias.tobiasson@oracle.com>, Markus Gronlund <markus.gronlund@oracle.com>, Mikael Auno <mikael.auno@oracle.com>, Nils Eliasson <nils.eliasson@oracle.com>, Nils Loodin <nils.loodin@oracle.com>, Rickard Backman <rickard.backman@oracle.com>, Staffan Larsen <staffan.larsen@oracle.com>, Stefan Karlsson <stefan.karlsson@oracle.com>, Yekaterina Kantserova <yekaterina.kantserova@oracle.com>
author | sla |
---|---|
date | Mon, 10 Jun 2013 11:30:51 +0200 |
parents | f95d63e2154a |
children | a4fdab16b621 |
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/* * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP #define SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP #include "utilities/xmlstream.hpp" class defaultStream : public xmlTextStream { friend void ostream_abort(); public: enum { NO_WRITER = -1 }; private: bool _inited; fileStream* _log_file; // XML-formatted file shared by all threads static int _output_fd; static int _error_fd; static FILE* _output_stream; static FILE* _error_stream; void init(); void init_log(); void finish_log(); void finish_log_on_error(char *buf, int buflen); public: // must defer time stamp due to the fact that os::init() hasn't // yet been called and os::elapsed_counter() may not be valid defaultStream() { _log_file = NULL; _inited = false; _writer = -1; _last_writer = -1; } ~defaultStream() { if (has_log_file()) finish_log(); } static inline FILE* output_stream() { return DisplayVMOutputToStderr ? _error_stream : _output_stream; } static inline FILE* error_stream() { return DisplayVMOutputToStdout ? _output_stream : _error_stream; } static inline int output_fd() { return DisplayVMOutputToStderr ? _error_fd : _output_fd; } static inline int error_fd() { return DisplayVMOutputToStdout ? _output_fd : _error_fd; } virtual void write(const char* s, size_t len); void flush() { // once we can determine whether we are in a signal handler, we // should add the following assert here: // assert(xxxxxx, "can not flush buffer inside signal handler"); xmlTextStream::flush(); fflush(output_stream()); if (has_log_file()) _log_file->flush(); } // advisory lock/unlock of _writer field: private: intx _writer; // thread_id with current rights to output intx _last_writer; public: intx hold(intx writer_id); void release(intx holder); intx writer() { return _writer; } bool has_log_file(); static defaultStream* instance; // sole instance }; #endif // SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP