MongoDB  2.7.0
timer-posixclock-inl.h
1 /* Copyright 2010 10gen Inc.
2  *
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
24 #define MONGO_TIMER_IMPL_POSIX_MONOTONIC_CLOCK
25 
26 #include <ctime>
27 
28 #include "mongo/util/assert_util.h"
29 
30 namespace mongo {
31 
32  unsigned long long Timer::now() const {
33  timespec the_time;
34  unsigned long long result;
35 
36  fassert(16160, !clock_gettime(CLOCK_MONOTONIC, &the_time));
37 
38  // Safe for 292 years after the clock epoch, even if we switch to a signed time value. On
39  // Linux, the monotonic clock's epoch is the UNIX epoch.
40  result = static_cast<unsigned long long>(the_time.tv_sec);
41  result *= nanosPerSecond;
42  result += static_cast<unsigned long long>(the_time.tv_nsec);
43  return result;
44  }
45 
46 } // namespace mongo
MONGO_CLIENT_API void fassert(int msgid, bool testOK)
aborts on condition failure
Definition: assert_util.h:195