1 // Copyright 2020 The Pigweed Authors
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
7 // https://www.apache.org/licenses/LICENSE-2.0
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
18 #include "pw_chrono/system_clock.h"
19 #include "pw_thread/sleep.h"
21 namespace pw::this_thread {
23 inline void sleep_for(chrono::SystemClock::duration for_at_least) {
24 for_at_least = std::max(for_at_least, chrono::SystemClock::duration::zero());
25 // Although many implementations do yield with sleep_for(0), it is not
26 // required, ergo we explicitly add handling.
27 if (for_at_least == chrono::SystemClock::duration::zero()) {
28 return std::this_thread::yield();
30 return std::this_thread::sleep_for(for_at_least);
33 inline void sleep_until(chrono::SystemClock::time_point until_at_least) {
34 // Although many implementations do yield with deadlines in the past until
35 // the current time, it is not required, ergo we explicitly add handling.
36 if (chrono::SystemClock::now() >= until_at_least) {
37 return std::this_thread::yield();
39 return std::this_thread::sleep_until(until_at_least);
42 } // namespace pw::this_thread