jdk8-mips64-public/hotspot: src/share/vm/utilities/ticks.cpp@710a3c8b516e

     1 /*

     2  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

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    23  */

    25 #include "precompiled.hpp"

    26 #include "runtime/os.hpp"

    27 #include "utilities/ticks.inline.hpp"

    29 #ifdef ASSERT

    30  const jlong Ticks::invalid_time_stamp = -2; // 0xFFFF FFFF`FFFF FFFE

    31 #endif

    33 void Ticks::stamp() {

    34   _stamp_ticks = os::elapsed_counter();

    35 }

    37 const Ticks Ticks::now() {

    38   Ticks t;

    39   t.stamp();

    40   return t;

    41 }

    43 Tickspan::Tickspan(const Ticks& end, const Ticks& start) {

    44   assert(end.value() != Ticks::invalid_time_stamp, "end is unstamped!");

    45   assert(start.value() != Ticks::invalid_time_stamp, "start is unstamped!");

    47   assert(end >= start, "negative time!");

    49   _span_ticks = end.value() - start.value();

    50 }

    52 template <typename ReturnType>

    53 static ReturnType time_conversion(const Tickspan& span, TicksToTimeHelper::Unit unit) {

    54   assert(TicksToTimeHelper::SECONDS == unit ||

    55          TicksToTimeHelper::MILLISECONDS == unit, "invalid unit!");

    57   ReturnType frequency_per_unit = (ReturnType)os::elapsed_frequency() / (ReturnType)unit;

    59   return (ReturnType) ((ReturnType)span.value() / frequency_per_unit);

    60 }

    62 double TicksToTimeHelper::seconds(const Tickspan& span) {

    63   return time_conversion<double>(span, SECONDS);

    64 }

    66 jlong TicksToTimeHelper::milliseconds(const Tickspan& span) {

    67   return time_conversion<jlong>(span, MILLISECONDS);

    68 }

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