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 "pw_chrono/system_clock.h"
17 #include "pw_sync/counting_semaphore.h"
18 
19 using pw::chrono::SystemClock;
20 
21 namespace pw::sync {
22 
CountingSemaphore()23 inline CountingSemaphore::CountingSemaphore()
24     : native_type_{.mutex = {}, .condition = {}, .count = 0} {}
25 
~CountingSemaphore()26 inline CountingSemaphore::~CountingSemaphore() {}
27 
try_acquire_for(chrono::SystemClock::duration for_at_least)28 inline bool CountingSemaphore::try_acquire_for(
29     chrono::SystemClock::duration for_at_least) {
30   // Due to spurious condition variable wakeups this cannot use wait_for().
31   return try_acquire_until(chrono::SystemClock::now() + for_at_least);
32 }
33 
34 inline CountingSemaphore::native_handle_type
native_handle()35 CountingSemaphore::native_handle() {
36   return native_type_;
37 }
38 
39 }  // namespace pw::sync
40