blob: b3c5213469131907ada28825eb9d3eeb5ceb9ca0 [file] [log] [blame]
// 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() {
// Mask interrupts.
// Disable task switching to ensure kernel APIs cannot switch to other tasks
// which could then end up deadlocking recursively on this same lock.
// We can't deadlock here so crash instead.
"Recursive InterruptSpinLock::lock() detected");
native_type_.locked = true;
void InterruptSpinLock::unlock() {
native_type_.locked = false;
OS_ResumeAllSuspendedTasks(); // Restore task switching.
OS_DecRI(); // Restore interrupts.
} // namespace pw::sync