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https://fuchsia.googlesource.com/third_party/pigweed.googlesource.com/pigweed/pigweed
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f298de4260
Bug: 350 Change-Id: Ia395cebedba24c9463e558059ebdb516759253e2 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/38740 Commit-Queue: Wyatt Hepler <hepler@google.com> Reviewed-by: Keir Mierle <keir@google.com>
46 lines
1.4 KiB
C++
46 lines
1.4 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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OS_IncDI();
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// We can't deadlock here so crash instead.
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PW_CHECK(!native_type_.locked.load(std::memory_order_relaxed),
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"Recursive InterruptSpinLock::lock() detected");
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native_type_.locked.store(true, std::memory_order_relaxed);
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}
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bool InterruptSpinLock::try_lock() {
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OS_IncDI();
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if (native_type_.locked.load(std::memory_order_relaxed)) {
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OS_DecRI(); // Already locked, restore interrupts and bail out.
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return false;
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}
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native_type_.locked.store(true, std::memory_order_relaxed);
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return true;
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}
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void InterruptSpinLock::unlock() {
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native_type_.locked.store(false, std::memory_order_relaxed);
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OS_DecRI();
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}
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} // namespace pw::sync
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