155 lines
5.2 KiB
C
155 lines
5.2 KiB
C
/****************************************************************************
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* mm/iob/iob.h
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*
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* SPDX-License-Identifier: Apache-2.0
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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 __MM_IOB_IOB_H
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#define __MM_IOB_IOB_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <debug.h>
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#include <nuttx/mm/iob.h>
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#include <nuttx/spinlock.h>
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#include <nuttx/semaphore.h>
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#ifdef CONFIG_MM_IOB
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define ROUNDUP(x, y) (((x) + (y) - 1) / (y) * (y))
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#if defined(CONFIG_DEBUG_FEATURES) && defined(CONFIG_IOB_DEBUG)
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# define ioberr _err
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# define iobwarn _warn
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# define iobinfo _info
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#else
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# define ioberr _none
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# define iobwarn _none
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# define iobinfo _none
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#endif /* CONFIG_DEBUG_FEATURES && CONFIG_IOB_DEBUG */
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* A list of all free, unallocated I/O buffers */
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extern FAR struct iob_s *g_iob_freelist;
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/* A list of I/O buffers that are committed for allocation */
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extern FAR struct iob_s *g_iob_committed;
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#if CONFIG_IOB_NCHAINS > 0
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/* A list of all free, unallocated I/O buffer queue containers */
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extern FAR struct iob_qentry_s *g_iob_freeqlist;
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/* A list of I/O buffer queue containers that are committed for allocation */
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extern FAR struct iob_qentry_s *g_iob_qcommitted;
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#endif
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/* Counting semaphores that tracks the number of free IOBs/qentries */
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extern sem_t g_iob_sem; /* Counts free I/O buffers */
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#if CONFIG_IOB_THROTTLE > 0
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extern sem_t g_throttle_sem; /* Counts available I/O buffers when throttled */
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#endif
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#if CONFIG_IOB_NCHAINS > 0
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extern sem_t g_qentry_sem; /* Counts free I/O buffer queue containers */
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#endif
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extern spinlock_t g_iob_lock;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: iob_alloc_qentry
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*
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* Description:
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* Allocate an I/O buffer chain container by taking the buffer at the head
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* of the free list. This function is intended only for internal use by
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* the IOB module.
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*
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****************************************************************************/
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FAR struct iob_qentry_s *iob_alloc_qentry(void);
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/****************************************************************************
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* Name: iob_tryalloc_qentry
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*
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* Description:
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* Try to allocate an I/O buffer chain container by taking the buffer at
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* the head of the free list without waiting for the container to become
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* free. This function is intended only for internal use by the IOB module.
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*
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****************************************************************************/
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FAR struct iob_qentry_s *iob_tryalloc_qentry(void);
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/****************************************************************************
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* Name: iob_free_qentry
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*
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* Description:
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* Free the I/O buffer chain container by returning it to the free list.
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* The link to the next I/O buffer in the chain is return.
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*
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****************************************************************************/
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FAR struct iob_qentry_s *iob_free_qentry(FAR struct iob_qentry_s *iobq);
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/****************************************************************************
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* Name: iob_notifier_signal
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*
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* Description:
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* An IOB has become available. Signal all threads waiting for an IOB
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* that an IOB is available.
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*
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* When an IOB becomes available, *all* of the waiters in this thread will
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* be signaled. If there are multiple waiters then only the highest
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* priority thread will get the IOB. Lower priority threads will need to
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* call iob_notifier_setup() once again.
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*
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* Input Parameters:
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* None.
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*
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* Returned Value:
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* None.
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*
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****************************************************************************/
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#ifdef CONFIG_IOB_NOTIFIER
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void iob_notifier_signal(void);
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#endif
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#endif /* CONFIG_MM_IOB */
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#endif /* __MM_IOB_IOB_H */
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