151 lines
5.1 KiB
C
151 lines
5.1 KiB
C
/****************************************************************************
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* libc/aio/aio_contain.c
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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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 <sched.h>
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#include "aio/aio.h"
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#ifdef CONFIG_FS_AIO
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: aio_contain
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*
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* Description:
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* Create and initialize a container for the provided AIO control block
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*
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* Input Parameters:
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* aiocbp - The AIO control block pointer
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*
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* Returned Value:
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* A reference to the new AIO control block container. This function
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* will not fail but will wait if necessary for the resources to perform
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* this operation.
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*
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****************************************************************************/
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FAR struct aio_container_s *aio_contain(FAR struct aiocb *aiocbp)
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{
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FAR struct aio_container_s *aioc;
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struct sched_param param;
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/* Allocate the AIO control block container, waiting for one to become
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* available if necessary. This should never fail.
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*/
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aioc = aioc_alloc();
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DEBUGASSERT(aioc);
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/* Initialize the container */
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memset(aioc, 0, sizeof(struct aio_container_s));
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aioc->aioc_aiocbp = aiocbp;
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aioc->aioc_pid = getpid();
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DEBUGVERIFY(sched_getparam (aioc->aioc_pid, ¶m));
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aioc->aioc_prio = param.sched_priority;
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/* Add the container to the pending transfer list. */
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aio_lock();
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dq_addlast(&aioc->aioc_link, &g_aio_pending);
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aio_unlock();
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return aioc;
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}
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/****************************************************************************
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* Name: aioc_decant
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*
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* Description:
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* Remove the AIO control block from the container and free all resources
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* used by the container.
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*
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* Input Parameters:
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* aioc - Pointer to the AIO control block container
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*
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* Returned Value:
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* A pointer to the no-longer contained AIO control block.
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*
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****************************************************************************/
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FAR struct aiocb *aioc_decant(FAR struct aio_container_s *aioc)
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{
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FAR struct aiocb *aiocbp;
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DEBUGASSERT(aioc);
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/* Remove the container to the pending transfer list. */
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aio_lock();
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dq_rem(&aioc->aioc_link, &g_aio_pending);
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aio_unlock();
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/* De-cant the AIO control block and return the container to the free list */
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aiocbp = aioc->acioc_aiocbp;
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aioc_free(aioc);
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return aiocbp;
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}
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#endif /* CONFIG_FS_AIO */
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