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