| // Copyright 2020 The Pigweed Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| // use this file except in compliance with the License. You may obtain a copy of |
| // the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| // License for the specific language governing permissions and limitations under |
| // the License. |
| #pragma once |
| |
| #include "pw_sync/interrupt_spin_lock.h" |
| #include "pw_sync/yield_core.h" |
| |
| namespace pw::sync { |
| |
| constexpr InterruptSpinLock::InterruptSpinLock() : native_type_() {} |
| |
| inline void InterruptSpinLock::lock() { |
| while (!try_lock()) { |
| PW_SYNC_YIELD_CORE_FOR_SMT(); |
| } |
| } |
| |
| inline bool InterruptSpinLock::try_lock() { |
| return !native_type_.test_and_set(std::memory_order_acquire); |
| } |
| |
| inline void InterruptSpinLock::unlock() { |
| native_type_.clear(std::memory_order_release); |
| } |
| |
| inline InterruptSpinLock::native_handle_type |
| InterruptSpinLock::native_handle() { |
| return native_type_; |
| } |
| |
| } // namespace pw::sync |
