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// @file mongo/util/timer.cpp
/* Copyright 2009 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/util/timer.h"
#include "mongo/util/system_tick_source.h"
#include "mongo/util/tick_source.h"
namespace mongo {
namespace {
const int64_t kMicrosPerSecond = 1000 * 1000;
} // unnamed namespace
Timer::Timer() : Timer(SystemTickSource::get()) {}
Timer::Timer(TickSource* tickSource)
: _tickSource(tickSource),
_microsPerCount(static_cast<double>(kMicrosPerSecond) / _tickSource->getTicksPerSecond()) {
reset();
}
long long Timer::now() const {
return _tickSource->getTicks();
}
} // namespace mongo
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