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 #ifdef BENCHMARK_OS_ZOS 28 #include <unistd.h> 29 #endif 30 31 namespace benchmark { 32 #ifdef BENCHMARK_OS_WINDOWS 33 // Window's Sleep takes milliseconds argument. SleepForMilliseconds(int milliseconds)34void SleepForMilliseconds(int milliseconds) { Sleep(milliseconds); } SleepForSeconds(double seconds)35void SleepForSeconds(double seconds) { 36 SleepForMilliseconds(static_cast<int>(kNumMillisPerSecond * seconds)); 37 } 38 #else // BENCHMARK_OS_WINDOWS 39 void SleepForMicroseconds(int microseconds) { 40 #ifdef BENCHMARK_OS_ZOS 41 // z/OS does not support nanosleep. Instead call sleep() and then usleep() to 42 // sleep for the remaining microseconds because usleep() will fail if its 43 // argument is greater than 1000000. 44 div_t sleepTime = div(microseconds, kNumMicrosPerSecond); 45 int seconds = sleepTime.quot; 46 while (seconds != 0) 47 seconds = sleep(seconds); 48 while (usleep(sleepTime.rem) == -1 && errno == EINTR) 49 ; 50 #else 51 struct timespec sleep_time; 52 sleep_time.tv_sec = microseconds / kNumMicrosPerSecond; 53 sleep_time.tv_nsec = (microseconds % kNumMicrosPerSecond) * kNumNanosPerMicro; 54 while (nanosleep(&sleep_time, &sleep_time) != 0 && errno == EINTR) 55 ; // Ignore signals and wait for the full interval to elapse. 56 #endif 57 } 58 59 void SleepForMilliseconds(int milliseconds) { 60 SleepForMicroseconds(milliseconds * kNumMicrosPerMilli); 61 } 62 63 void SleepForSeconds(double seconds) { 64 SleepForMicroseconds(static_cast<int>(seconds * kNumMicrosPerSecond)); 65 } 66 #endif // BENCHMARK_OS_WINDOWS 67 } // end namespace benchmark 68