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 27 namespace benchmark { 28 #ifdef BENCHMARK_OS_WINDOWS 29 // Window's Sleep takes milliseconds argument. SleepForMilliseconds(int milliseconds)30void SleepForMilliseconds(int milliseconds) { Sleep(milliseconds); } SleepForSeconds(double seconds)31void SleepForSeconds(double seconds) { 32 SleepForMilliseconds(static_cast<int>(kNumMillisPerSecond * seconds)); 33 } 34 #else // BENCHMARK_OS_WINDOWS 35 void 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 43 void SleepForMilliseconds(int milliseconds) { 44 SleepForMicroseconds(milliseconds * kNumMicrosPerMilli); 45 } 46 47 void SleepForSeconds(double seconds) { 48 SleepForMicroseconds(static_cast<int>(seconds * kNumMicrosPerSecond)); 49 } 50 #endif // BENCHMARK_OS_WINDOWS 51 } // end namespace benchmark 52