author | coleenp |
Fri, 04 Jan 2019 15:06:01 -0500 | |
changeset 53149 | 259c36ef27df |
parent 53077 | 33b8f6f4cdf5 |
permissions | -rw-r--r-- |
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/* |
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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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SpinYield::SpinYield(uint spin_limit, uint yield_limit, uint sleep_ns) : |
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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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_sleep_ns(sleep_ns) |
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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_nanosleep(_sleep_ns); |
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_sleep_time += Ticks::now() - 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 = " UINT64_FORMAT " usecs", |
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_sleep_time.milliseconds()); |
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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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} |