116 lines
3.2 KiB
C++
116 lines
3.2 KiB
C++
// @file timer.h
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/* Copyright 2010 10gen Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include "time_support.h"
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namespace mongo {
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#if !defined(_WIN32)
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/**
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* simple scoped timer
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*/
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class Timer /*copyable*/ {
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public:
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Timer() { reset(); }
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int seconds() const { return (int)(micros() / 1000000); }
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int millis() const { return (int)(micros() / 1000); }
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int minutes() const { return seconds() / 60; }
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/** gets time interval and resets at the same time. this way we can call curTimeMicros
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once instead of twice if one wanted millis() and then reset().
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@return time in millis
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*/
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int millisReset() {
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unsigned long long now = curTimeMicros64();
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int m = (int)((now-old)/1000);
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old = now;
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return m;
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}
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// note: dubious that the resolution is as anywhere near as high as ethod name implies!
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unsigned long long micros() const {
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unsigned long long n = curTimeMicros64();
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return n - old;
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}
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unsigned long long micros(unsigned long long & n) const { // returns cur time in addition to timer result
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n = curTimeMicros64();
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return n - old;
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}
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void reset() { old = curTimeMicros64(); }
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private:
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unsigned long long old;
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};
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#else
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class Timer /*copyable*/ {
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public:
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Timer() { reset(); }
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int seconds() const {
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int s = static_cast<int>((now() - old) / countsPerSecond);
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return s;
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}
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int millis() const {
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return (int)
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((now() - old) * 1000.0 / countsPerSecond);
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}
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int minutes() const { return seconds() / 60; }
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/** gets time interval and resets at the same time. this way we can call curTimeMicros
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once instead of twice if one wanted millis() and then reset().
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@return time in millis
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*/
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int millisReset() {
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unsigned long long nw = now();
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int m = static_cast<int>((nw - old) * 1000.0 / countsPerSecond);
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old = nw;
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return m;
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}
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void reset() {
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old = now();
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}
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unsigned long long micros() const {
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return (unsigned long long)
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((now() - old) * 1000000.0 / countsPerSecond);
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}
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static unsigned long long countsPerSecond;
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private:
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unsigned long long now() const {
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LARGE_INTEGER i;
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QueryPerformanceCounter(&i);
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return i.QuadPart;
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}
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unsigned long long old;
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};
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#endif
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} // namespace mongo
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