43 lines
1.3 KiB
C++
43 lines
1.3 KiB
C++
// Copyright 2021 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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#include "pw_sync/interrupt_spin_lock.h"
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#include "RTOS.h"
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#include "pw_assert/check.h"
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namespace pw::sync {
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void InterruptSpinLock::lock() {
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// Mask interrupts.
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OS_IncDI();
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// Disable task switching to ensure kernel APIs cannot switch to other tasks
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// which could then end up deadlocking recursively on this same lock.
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OS_SuspendAllTasks();
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// We can't deadlock here so crash instead.
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PW_DCHECK(!native_type_.locked,
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"Recursive InterruptSpinLock::lock() detected");
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native_type_.locked = true;
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}
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void InterruptSpinLock::unlock() {
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native_type_.locked = false;
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OS_ResumeAllSuspendedTasks(); // Restore task switching.
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OS_DecRI(); // Restore interrupts.
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}
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} // namespace pw::sync
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