1 // Copyright 2021 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_assert/assert.h" 17 #include "pw_sync/mutex.h" 18 19 namespace pw::sync { 20 Mutex()21inline Mutex::Mutex() : native_type_() {} 22 23 inline Mutex::~Mutex() = default; 24 lock()25inline void Mutex::lock() { PW_ASSERT(try_lock()); } 26 try_lock()27inline bool Mutex::try_lock() { 28 return !native_type_.test_and_set(std::memory_order_acquire); 29 } 30 unlock()31inline void Mutex::unlock() { 32 PW_ASSERT(native_type_.test_and_set(std::memory_order_acquire)); 33 native_type_.clear(std::memory_order_release); 34 } 35 native_handle()36inline Mutex::native_handle_type Mutex::native_handle() { return native_type_; } 37 38 } // namespace pw::sync 39