158a927587
Added SpinYield utility class. Co-authored-by: Robbin Ehn <robbin.ehn@oracle.com> Reviewed-by: dcubed, coleenp, dholmes
76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
/*
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* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "runtime/os.hpp"
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#include "utilities/ostream.hpp"
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#include "utilities/spinYield.hpp"
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#include "utilities/ticks.inline.hpp"
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SpinYield::SpinYield(uint spin_limit, uint yield_limit) :
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_sleep_time(),
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_spins(0),
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_yields(0),
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_spin_limit(os::is_MP() ? spin_limit : 0),
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_yield_limit(yield_limit)
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{}
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void SpinYield::yield_or_sleep() {
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if (_yields < _yield_limit) {
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++_yields;
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os::naked_yield();
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} else {
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Ticks sleep_start = Ticks::now();
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os::naked_short_sleep(1);
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Ticks sleep_end = Ticks::now();
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_sleep_time += (sleep_end - sleep_start);
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}
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}
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static const char* print_separator(outputStream* s, const char* separator) {
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s->print("%s", separator);
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return ", ";
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}
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void SpinYield::report(outputStream* s) const {
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const char* initial_separator = "";
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const char* separator = initial_separator;
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if (_spins > 0) { // Report spins, if any.
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separator = print_separator(s, separator);
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s->print("spins = %u", _spins);
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}
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if (_yields > 0) { // Report yields, if any.
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separator = print_separator(s, separator);
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s->print("yields = %u", _yields);
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}
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if (_sleep_time.value() != 0) { // Report sleep duration, if slept.
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separator = print_separator(s, separator);
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s->print("sleep = " JLONG_FORMAT " usecs",
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TicksToTimeHelper::milliseconds(_sleep_time));
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}
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if (separator == initial_separator) {
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s->print("no waiting");
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}
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}
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