1 // Copyright 2021 The Pigweed Authors
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
7 // https://www.apache.org/licenses/LICENSE-2.0
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
16 #include "pw_assert/light.h"
17 #include "pw_sync/spin_lock.h"
18 #include "pw_sync/yield_core.h"
22 inline SpinLock::SpinLock() : native_type_() {}
24 inline void SpinLock::lock() { PW_ASSERT(try_lock()); }
26 inline bool SpinLock::try_lock() {
27 // TODO(pwbug/303): Use the pw_interrupt API here to disable interrupts.
28 return !native_type_.test_and_set(std::memory_order_acquire);
31 inline void SpinLock::unlock() {
32 native_type_.clear(std::memory_order_release);
35 inline SpinLock::native_handle_type SpinLock::native_handle() {
39 } // namespace pw::sync