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// 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
// 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 "tx_api.h"
namespace pw::sync::backend {
// This currently does not support SMP as there's no actual lock to spin on
// internally, see the pw_sync_threadx docs for more details.
#error "This backend does not support SMP versions of ThreadX yet!"
#endif // defined(TX_SMP_CORE_ID)
struct NativeInterruptSpinLock {
enum class State {
kUnlocked = 0, // This must be 0 to ensure it is bss eligible.
kLockedFromInterrupt = 1,
kLockedFromThread = 2,
State state; // Used to detect recursion and interrupt context escapes.
UINT saved_interrupt_mask;
UINT saved_preemption_threshold;
using NativeInterruptSpinLockHandle = NativeInterruptSpinLock&;
} // namespace pw::sync::backend