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// Copyright 2021 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
// 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.
#include "pw_sync/interrupt_spin_lock.h"
#include "RTOS.h"
#include "pw_assert/check.h"
namespace pw::sync {
void InterruptSpinLock::lock() {
// We can't deadlock here so crash instead.
"Recursive InterruptSpinLock::lock() detected");, std::memory_order_relaxed);
bool InterruptSpinLock::try_lock() {
if (native_type_.locked.load(std::memory_order_relaxed)) {
OS_DecRI(); // Already locked, restore interrupts and bail out.
return false;
}, std::memory_order_relaxed);
return true;
void InterruptSpinLock::unlock() {, std::memory_order_relaxed);
} // namespace pw::sync