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src/share/vm/utilities/defaultStream.hpp@7ae4e26cb1e0 (annotated)

src/share/vm/utilities/defaultStream.hpp

Thu, 12 Oct 2017 21:27:07 +0800

author

aoqi

date

Thu, 12 Oct 2017 21:27:07 +0800

changeset 7535

7ae4e26cb1e0

parent 7448

a4fdab16b621

parent 6876

710a3c8b516e

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#ifndef SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP
aoqi@0	26	#define SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP
aoqi@0	27
aoqi@0	28	#include "utilities/xmlstream.hpp"
aoqi@0	29
aoqi@0	30	class defaultStream : public xmlTextStream {
aoqi@0	31	friend void ostream_abort();
aoqi@0	32	public:
aoqi@0	33	enum { NO_WRITER = -1 };
aoqi@0	34	private:
aoqi@0	35	bool _inited;
aoqi@0	36	fileStream* _log_file; // XML-formatted file shared by all threads
aoqi@0	37	static int _output_fd;
aoqi@0	38	static int _error_fd;
aoqi@0	39	static FILE* _output_stream;
aoqi@0	40	static FILE* _error_stream;
aoqi@0	41
aoqi@0	42	void init();
aoqi@0	43	void init_log();
brutisso@7448	44	fileStream* open_file(const char* log_name);
brutisso@7448	45	void start_log();
aoqi@0	46	void finish_log();
aoqi@0	47	void finish_log_on_error(char *buf, int buflen);
aoqi@0	48	public:
aoqi@0	49	// must defer time stamp due to the fact that os::init() hasn't
aoqi@0	50	// yet been called and os::elapsed_counter() may not be valid
aoqi@0	51	defaultStream() {
aoqi@0	52	_log_file = NULL;
aoqi@0	53	_inited = false;
aoqi@0	54	_writer = -1;
aoqi@0	55	_last_writer = -1;
aoqi@0	56	}
aoqi@0	57
aoqi@0	58	~defaultStream() {
aoqi@0	59	if (has_log_file()) finish_log();
aoqi@0	60	}
aoqi@0	61
aoqi@0	62	static inline FILE* output_stream() {
aoqi@0	63	return DisplayVMOutputToStderr ? _error_stream : _output_stream;
aoqi@0	64	}
aoqi@0	65	static inline FILE* error_stream() {
aoqi@0	66	return DisplayVMOutputToStdout ? _output_stream : _error_stream;
aoqi@0	67	}
aoqi@0	68	static inline int output_fd() {
aoqi@0	69	return DisplayVMOutputToStderr ? _error_fd : _output_fd;
aoqi@0	70	}
aoqi@0	71	static inline int error_fd() {
aoqi@0	72	return DisplayVMOutputToStdout ? _output_fd : _error_fd;
aoqi@0	73	}
aoqi@0	74
aoqi@0	75	virtual void write(const char* s, size_t len);
aoqi@0	76
aoqi@0	77	void flush() {
aoqi@0	78	// once we can determine whether we are in a signal handler, we
aoqi@0	79	// should add the following assert here:
aoqi@0	80	// assert(xxxxxx, "can not flush buffer inside signal handler");
aoqi@0	81	xmlTextStream::flush();
aoqi@0	82	fflush(output_stream());
aoqi@0	83	if (has_log_file()) _log_file->flush();
aoqi@0	84	}
aoqi@0	85
aoqi@0	86	// advisory lock/unlock of _writer field:
aoqi@0	87	private:
aoqi@0	88	intx _writer; // thread_id with current rights to output
aoqi@0	89	intx _last_writer;
aoqi@0	90	public:
aoqi@0	91	intx hold(intx writer_id);
aoqi@0	92	void release(intx holder);
aoqi@0	93	intx writer() { return _writer; }
aoqi@0	94	bool has_log_file();
aoqi@0	95
aoqi@0	96	static defaultStream* instance; // sole instance
aoqi@0	97	};
aoqi@0	98
aoqi@0	99	#endif // SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP