1 // Copyright 2022 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 <thread> 17 18 #include "pw_assert/assert.h" 19 20 namespace pw::sync { 21 22 inline RecursiveMutex::RecursiveMutex() = default; 23 ~RecursiveMutex()24inline RecursiveMutex::~RecursiveMutex() { 25 PW_ASSERT(native_type_.lock_count == 0u); 26 } 27 lock()28inline void RecursiveMutex::lock() { 29 native_handle().lock(); 30 native_type_.lock_count += 1; 31 } 32 try_lock()33inline bool RecursiveMutex::try_lock() { 34 if (native_handle().try_lock()) { 35 native_type_.lock_count += 1; 36 return true; 37 } 38 return false; 39 } 40 unlock()41inline void RecursiveMutex::unlock() { 42 PW_ASSERT(native_type_.lock_count > 0u); 43 native_type_.lock_count -= 1; 44 native_handle().unlock(); 45 } 46 47 // Return a std::recursive_mutex instead of the customized class. native_handle()48inline RecursiveMutex::native_handle_type RecursiveMutex::native_handle() { 49 return native_type_.mutex; 50 } 51 52 } // namespace pw::sync 53