69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
/*
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* Copyright (c) 2013, 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/ticks.inline.hpp"
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#ifdef ASSERT
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const jlong Ticks::invalid_time_stamp = -2; // 0xFFFF FFFF`FFFF FFFE
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#endif
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void Ticks::stamp() {
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_stamp_ticks = os::elapsed_counter();
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}
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const Ticks Ticks::now() {
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Ticks t;
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t.stamp();
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return t;
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}
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Tickspan::Tickspan(const Ticks& end, const Ticks& start) {
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assert(end.value() != Ticks::invalid_time_stamp, "end is unstamped!");
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assert(start.value() != Ticks::invalid_time_stamp, "start is unstamped!");
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assert(end >= start, "negative time!");
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_span_ticks = end.value() - start.value();
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}
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template <typename ReturnType>
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static ReturnType time_conversion(const Tickspan& span, TicksToTimeHelper::Unit unit) {
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assert(TicksToTimeHelper::SECONDS == unit ||
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TicksToTimeHelper::MILLISECONDS == unit, "invalid unit!");
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ReturnType frequency_per_unit = (ReturnType)os::elapsed_frequency() / (ReturnType)unit;
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return (ReturnType) ((ReturnType)span.value() / frequency_per_unit);
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}
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double TicksToTimeHelper::seconds(const Tickspan& span) {
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return time_conversion<double>(span, SECONDS);
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}
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jlong TicksToTimeHelper::milliseconds(const Tickspan& span) {
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return time_conversion<jlong>(span, MILLISECONDS);
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}
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