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. |
34 | void SleepForMilliseconds(int milliseconds) { Sleep(milliseconds); } |
35 | void 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) seconds = sleep(seconds); |
47 | while (usleep(sleepTime.rem) == -1 && errno == EINTR) |
48 | ; |
49 | #else |
50 | struct timespec sleep_time; |
51 | sleep_time.tv_sec = microseconds / kNumMicrosPerSecond; |
52 | sleep_time.tv_nsec = (microseconds % kNumMicrosPerSecond) * kNumNanosPerMicro; |
53 | while (nanosleep(&sleep_time, &sleep_time) != 0 && errno == EINTR) |
54 | ; // Ignore signals and wait for the full interval to elapse. |
55 | #endif |
56 | } |
57 | |
58 | void SleepForMilliseconds(int milliseconds) { |
59 | SleepForMicroseconds(milliseconds * kNumMicrosPerMilli); |
60 | } |
61 | |
62 | void SleepForSeconds(double seconds) { |
63 | SleepForMicroseconds(static_cast<int>(seconds * kNumMicrosPerSecond)); |
64 | } |
65 | #endif // BENCHMARK_OS_WINDOWS |
66 | } // end namespace benchmark |
67 | |