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