126 lines
3.7 KiB
C
126 lines
3.7 KiB
C
/****************************************************************************
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* include/nuttx/hwspinlock/hwspinlock.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://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
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* under the License.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_HWSPINLOCK_HWSPINLOCK_H
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#define __INCLUDE_NUTTX_HWSPINLOCK_HWSPINLOCK_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/compiler.h>
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#include <nuttx/spinlock.h>
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#include <stdbool.h>
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/****************************************************************************
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* Public Types
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****************************************************************************/
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struct hwspinlock_dev_s;
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struct hwspinlock_ops_s
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{
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CODE bool (*trylock)(FAR struct hwspinlock_dev_s *dev,
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int id, int priority);
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CODE void (*relax)(FAR struct hwspinlock_dev_s *dev,
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int id, int priority);
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CODE void (*unlock)(FAR struct hwspinlock_dev_s *dev, int id);
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};
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struct hwspinlock_dev_s
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{
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spinlock_t lock;
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FAR const struct hwspinlock_ops_s *ops;
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};
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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static inline bool hwspin_trylock(FAR struct hwspinlock_dev_s *dev,
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int id, int priority)
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{
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return dev->ops->trylock(dev, id, priority);
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}
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static inline bool hwspin_trylock_irqsave(FAR struct hwspinlock_dev_s *dev,
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int id, int priority,
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FAR irqstate_t *flags)
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{
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*flags = spin_lock_irqsave(&dev->lock);
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if (hwspin_trylock(dev, id, priority))
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{
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return true;
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}
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spin_unlock_irqrestore(&dev->lock, *flags);
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return false;
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}
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static inline void hwspin_lock(FAR struct hwspinlock_dev_s *dev,
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int id, int priority)
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{
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while (!dev->ops->trylock(dev, id, priority))
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{
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if (dev->ops->relax)
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{
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dev->ops->relax(dev, id, priority);
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}
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}
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}
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static inline irqstate_t
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hwspin_lock_irqsave(FAR struct hwspinlock_dev_s *dev,
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int id, int priority)
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{
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irqstate_t flags = spin_lock_irqsave(&dev->lock);
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hwspin_lock(dev, id, priority);
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return flags;
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}
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static inline void hwspin_unlock(FAR struct hwspinlock_dev_s *dev,
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int id, int priority)
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{
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dev->ops->unlock(dev, id);
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}
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static inline void hwspin_unlock_restore(FAR struct hwspinlock_dev_s *dev,
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int id, int priority,
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irqstate_t flags)
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{
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hwspin_unlock(dev, id);
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spin_lock_restore(&dev->lock, flags);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* __INCLUDE_NUTTX_HWSPINLOCK_HWSPINLOCK_H */
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