1 // Copyright 2020 The Pigweed Authors
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
5 // the License at
6 //
7 // https://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, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
13 // the License.
14 #pragma once
15
16 #include <thread>
17
18 #include "pw_chrono/system_clock.h"
19 #include "pw_thread/sleep.h"
20
21 namespace pw::this_thread {
22
sleep_for(chrono::SystemClock::duration sleep_duration)23 inline void sleep_for(chrono::SystemClock::duration sleep_duration) {
24 sleep_duration =
25 std::max(sleep_duration, chrono::SystemClock::duration::zero());
26 // Although many implementations do yield with sleep_for(0), it is not
27 // required, ergo we explicitly add handling.
28 if (sleep_duration == chrono::SystemClock::duration::zero()) {
29 return std::this_thread::yield();
30 }
31 #if defined(_WIN32)
32 // For some reason MinGW's implementation for sleep_for doesn't work
33 // correctly, however sleep_until does.
34 return std::this_thread::sleep_until(
35 chrono::SystemClock::TimePointAfterAtLeast(sleep_duration));
36 #else
37 return std::this_thread::sleep_for(sleep_duration);
38 #endif // defined(_WIN32)
39 }
40
sleep_until(chrono::SystemClock::time_point wakeup_time)41 inline void sleep_until(chrono::SystemClock::time_point wakeup_time) {
42 // Although many implementations do yield with deadlines in the past until
43 // the current time, it is not required, ergo we explicitly add handling.
44 if (chrono::SystemClock::now() >= wakeup_time) {
45 return std::this_thread::yield();
46 }
47 return std::this_thread::sleep_until(wakeup_time);
48 }
49
50 } // namespace pw::this_thread
51