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 namespace pw::sync { 20 CountingSemaphore()21inline CountingSemaphore::CountingSemaphore() 22 : native_type_{.mutex = {}, .condition = {}, .count = 0} {} 23 ~CountingSemaphore()24inline CountingSemaphore::~CountingSemaphore() {} 25 try_acquire_for(pw::chrono::SystemClock::duration timeout)26inline bool CountingSemaphore::try_acquire_for( 27 pw::chrono::SystemClock::duration timeout) { 28 // Due to spurious condition variable wakeups this cannot use wait_for(). 29 return try_acquire_until( 30 pw::chrono::SystemClock::TimePointAfterAtLeast(timeout)); 31 } 32 33 inline CountingSemaphore::native_handle_type native_handle()34CountingSemaphore::native_handle() { 35 return native_type_; 36 } 37 38 } // namespace pw::sync 39