/* * Copyright (c) 2016, ARM Limited, All Rights Reserved * SPDX-License-Identifier: Apache-2.0 * * 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 * * http://www.apache.org/licenses/LICENSE-2.0 * * 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. */ #ifndef __UVISOR_API_UVISOR_SPINLOCK_H__ #define __UVISOR_API_UVISOR_SPINLOCK_H__ #include "api/inc/uvisor_exports.h" #include <stdbool.h> typedef struct { bool acquired; } UvisorSpinlock; /* This function is safe to call from interrupt context. */ UVISOR_EXTERN void uvisor_spin_init(UvisorSpinlock * spinlock); /* Attempt to spin lock once. Return true if the lock was obtained, false if * otherwise. This function is safe to call from interrupt context. */ UVISOR_EXTERN bool uvisor_spin_trylock(UvisorSpinlock * spinlock); /* Spin in a tight loop until the lock is obtained. This function is safe to * call from interrupt context, but probably not wise. */ UVISOR_EXTERN void uvisor_spin_lock(UvisorSpinlock * spinlock); /* Unlock the spin lock. This function is safe to call from interrupt context. * */ UVISOR_EXTERN void uvisor_spin_unlock(UvisorSpinlock * spinlock); #endif /* __UVISOR_API_UVISOR_SPINLOCK_H__ */