163 lines
4.4 KiB
C
163 lines
4.4 KiB
C
/****************************************************************************
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* fs/aio/aioc_contain.c
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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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/****************************************************************************
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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 <assert.h>
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#include <errno.h>
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#include <nuttx/sched.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/net/net.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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* 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. NULL will be returned on certain errors with the
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* errno value already set appropriately.
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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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FAR struct file *filep;
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#ifdef CONFIG_PRIORITY_INHERITANCE
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struct sched_param param;
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#endif
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int ret;
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/* Get the file structure corresponding to the file descriptor. */
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ret = fs_getfilep(aiocbp->aio_fildes, &filep);
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if (ret < 0)
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{
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goto errout;
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}
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DEBUGASSERT(filep != NULL);
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/* Allocate the AIO control block container, waiting for one to become
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* available if necessary. This should not fail except for in the case
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* where the calling thread is canceled.
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*/
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aioc = aioc_alloc();
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if (aioc != NULL)
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{
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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_filep = filep;
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aioc->aioc_pid = getpid();
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#ifdef CONFIG_PRIORITY_INHERITANCE
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DEBUGVERIFY(nxsched_get_param (aioc->aioc_pid, ¶m));
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aioc->aioc_prio = param.sched_priority;
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#endif
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/* Add the container to the pending transfer list. */
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ret = aio_lock();
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if (ret < 0)
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{
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aioc_free(aioc);
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goto errout;
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}
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dq_addlast(&aioc->aioc_link, &g_aio_pending);
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aio_unlock();
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}
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return aioc;
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errout:
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set_errno(-ret);
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return NULL;
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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 = NULL;
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int ret;
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DEBUGASSERT(aioc);
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/* Remove the container to the pending transfer list. */
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ret = aio_lock();
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if (ret >= 0)
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{
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dq_rem(&aioc->aioc_link, &g_aio_pending);
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/* De-cant the AIO control block and return the container to the
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* free list.
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*/
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aiocbp = aioc->aioc_aiocbp;
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aioc_free(aioc);
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aio_unlock();
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}
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return aiocbp;
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}
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#endif /* CONFIG_FS_AIO */
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