1// Copyright 2015 Google Inc. All rights reserved.
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#include "sleep.h"
16
17#include <cerrno>
18#include <cstdlib>
19#include <ctime>
20
21#include "internal_macros.h"
22
23#ifdef BENCHMARK_OS_WINDOWS
24#include <Windows.h>
25#endif
26
27namespace benchmark {
28#ifdef BENCHMARK_OS_WINDOWS
29// Window's Sleep takes milliseconds argument.
30void SleepForMilliseconds(int milliseconds) { Sleep(milliseconds); }
31void SleepForSeconds(double seconds) {
32  SleepForMilliseconds(static_cast<int>(kNumMillisPerSecond * seconds));
33}
34#else   // BENCHMARK_OS_WINDOWS
35void SleepForMicroseconds(int microseconds) {
36  struct timespec sleep_time;
37  sleep_time.tv_sec = microseconds / kNumMicrosPerSecond;
38  sleep_time.tv_nsec = (microseconds % kNumMicrosPerSecond) * kNumNanosPerMicro;
39  while (nanosleep(&sleep_time, &sleep_time) != 0 && errno == EINTR)
40    ;  // Ignore signals and wait for the full interval to elapse.
41}
42
43void SleepForMilliseconds(int milliseconds) {
44  SleepForMicroseconds(milliseconds * kNumMicrosPerMilli);
45}
46
47void SleepForSeconds(double seconds) {
48  SleepForMicroseconds(static_cast<int>(seconds * kNumMicrosPerSecond));
49}
50#endif  // BENCHMARK_OS_WINDOWS
51}  // end namespace benchmark
52