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 <algorithm>
17 #include <thread>
18
19 #include "pw_chrono/system_clock.h"
20 #include "pw_thread/sleep.h"
21
22 namespace pw::this_thread {
23
sleep_for(chrono::SystemClock::duration sleep_duration)24 inline void sleep_for(chrono::SystemClock::duration sleep_duration) {
25 sleep_duration =
26 std::max(sleep_duration, chrono::SystemClock::duration::zero());
27 // Although many implementations do yield with sleep_for(0), it is not
28 // required, ergo we explicitly add handling.
29 if (sleep_duration == chrono::SystemClock::duration::zero()) {
30 return std::this_thread::yield();
31 }
32 #if defined(_WIN32)
33 // For some reason MinGW's implementation for sleep_for doesn't work
34 // correctly, however sleep_until does.
35 return std::this_thread::sleep_until(
36 chrono::SystemClock::TimePointAfterAtLeast(sleep_duration));
37 #else
38 return std::this_thread::sleep_for(sleep_duration);
39 #endif // defined(_WIN32)
40 }
41
sleep_until(chrono::SystemClock::time_point wakeup_time)42 inline void sleep_until(chrono::SystemClock::time_point wakeup_time) {
43 // Although many implementations do yield with deadlines in the past until
44 // the current time, it is not required, ergo we explicitly add handling.
45 if (chrono::SystemClock::now() >= wakeup_time) {
46 return std::this_thread::yield();
47 }
48 return std::this_thread::sleep_until(wakeup_time);
49 }
50
51 } // namespace pw::this_thread
52