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src/share/vm/jfr/recorder/stringpool/jfrStringPoolBuffer.cpp@d2c2cd90513e (annotated)

src/share/vm/jfr/recorder/stringpool/jfrStringPoolBuffer.cpp

Wed, 17 Jun 2020 11:43:05 +0300

author

apetushkov

date

Wed, 17 Jun 2020 11:43:05 +0300

changeset 9928

d2c2cd90513e

parent 9858

b985cbb00e68

permissions

-rw-r--r--

8220293: Deadlock in JFR string pool
Reviewed-by: rehn, egahlin

apetushkov@9858	1	/*
apetushkov@9928	2	* Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
apetushkov@9858	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
apetushkov@9858	4	*
apetushkov@9858	5	* This code is free software; you can redistribute it and/or modify it
apetushkov@9858	6	* under the terms of the GNU General Public License version 2 only, as
apetushkov@9858	7	* published by the Free Software Foundation.
apetushkov@9858	8	*
apetushkov@9858	9	* This code is distributed in the hope that it will be useful, but WITHOUT
apetushkov@9858	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
apetushkov@9858	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
apetushkov@9858	12	* version 2 for more details (a copy is included in the LICENSE file that
apetushkov@9858	13	* accompanied this code).
apetushkov@9858	14	*
apetushkov@9858	15	* You should have received a copy of the GNU General Public License version
apetushkov@9858	16	* 2 along with this work; if not, write to the Free Software Foundation,
apetushkov@9858	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
apetushkov@9858	18	*
apetushkov@9858	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
apetushkov@9858	20	* or visit www.oracle.com if you need additional information or have any
apetushkov@9858	21	* questions.
apetushkov@9858	22	*
apetushkov@9858	23	*/
apetushkov@9858	24
apetushkov@9858	25	#include "precompiled.hpp"
apetushkov@9858	26	#include "jfr/recorder/stringpool/jfrStringPoolBuffer.hpp"
apetushkov@9858	27
apetushkov@9858	28	JfrStringPoolBuffer::JfrStringPoolBuffer() : JfrBuffer(), _string_count_pos(0), _string_count_top(0) {}
apetushkov@9858	29
apetushkov@9858	30	void JfrStringPoolBuffer::reinitialize() {
apetushkov@9858	31	assert(acquired_by_self() || retired(), "invariant");
apetushkov@9858	32	set_string_pos(0);
apetushkov@9858	33	set_string_top(0);
apetushkov@9928	34	JfrBuffer::reinitialize();
apetushkov@9858	35	}
apetushkov@9858	36
apetushkov@9858	37	uint64_t JfrStringPoolBuffer::string_pos() const {
apetushkov@9858	38	assert(acquired_by_self() || retired(), "invariant");
apetushkov@9858	39	return _string_count_pos;
apetushkov@9858	40	}
apetushkov@9858	41
apetushkov@9858	42	uint64_t JfrStringPoolBuffer::string_top() const {
apetushkov@9858	43	assert(acquired_by_self() || retired(), "invariant");
apetushkov@9858	44	return _string_count_top;
apetushkov@9858	45	}
apetushkov@9858	46
apetushkov@9858	47	uint64_t JfrStringPoolBuffer::string_count() const {
apetushkov@9858	48	assert(acquired_by_self() || retired(), "invariant");
apetushkov@9858	49	return string_pos() - string_top();
apetushkov@9858	50	}
apetushkov@9858	51
apetushkov@9858	52	void JfrStringPoolBuffer::set_string_pos(uint64_t value) {
apetushkov@9858	53	assert(acquired_by_self() || retired(), "invariant");
apetushkov@9858	54	_string_count_pos = value;
apetushkov@9858	55	}
apetushkov@9858	56
apetushkov@9858	57	void JfrStringPoolBuffer::increment(uint64_t value) {
apetushkov@9928	58	assert(acquired_by_self(), "invariant");
apetushkov@9858	59	++_string_count_pos;
apetushkov@9858	60	}
apetushkov@9858	61
apetushkov@9858	62	void JfrStringPoolBuffer::set_string_top(uint64_t value) {
apetushkov@9858	63	assert(acquired_by_self() || retired(), "invariant");
apetushkov@9858	64	_string_count_top = value;
apetushkov@9858	65	}