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/* 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.
*/
/**
* Inline function implementations for timers on systems that support the
* POSIX clock API and CLOCK_MONOTONIC clock.
*
* This file should only be included through timer-inl.h, which selects the
* particular implementation based on target platform.
*/
#define MONGO_TIMER_IMPL_POSIX_MONOTONIC_CLOCK
#include <ctime>
#include "mongo/util/assert_util.h"
namespace mongo {
unsigned long long Timer::now() const {
timespec the_time;
unsigned long long result;
fassert(16160, !clock_gettime(CLOCK_MONOTONIC, &the_time));
// Safe for 292 years after the clock epoch, even if we switch to a signed time value. On
// Linux, the monotonic clock's epoch is the UNIX epoch.
result = static_cast<unsigned long long>(the_time.tv_sec);
result *= nanosPerSecond;
result += static_cast<unsigned long long>(the_time.tv_nsec);
return result;
}
} // namespace mongo
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