249 lines
7.8 KiB
C
249 lines
7.8 KiB
C
/****************************************************************************
|
|
* fs/aio/aio.h
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifndef __FS_AIO_AIO_H
|
|
#define __FS_AIO_AIO_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <string.h>
|
|
#include <aio.h>
|
|
|
|
#include <nuttx/queue.h>
|
|
#include <nuttx/wqueue.h>
|
|
|
|
#ifdef CONFIG_FS_AIO
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/* Configuration ************************************************************/
|
|
|
|
/* Number of pre-allocated AIO Control block containers */
|
|
|
|
#ifndef CONFIG_FS_NAIOC
|
|
# define CONFIG_FS_NAIOC 8
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Types
|
|
****************************************************************************/
|
|
|
|
/* This structure contains one AIO control block and appends information
|
|
* needed by the logic running on the worker thread. These structures are
|
|
* pre-allocated, the number pre-allocated controlled by CONFIG_FS_NAIOC.
|
|
*/
|
|
|
|
struct file;
|
|
struct aio_container_s
|
|
{
|
|
dq_entry_t aioc_link; /* Supports a doubly linked list */
|
|
FAR struct aiocb *aioc_aiocbp; /* The contained AIO control block */
|
|
FAR struct file *aioc_filep; /* File structure to use with the I/O */
|
|
struct work_s aioc_work; /* Used to defer I/O to the work thread */
|
|
pid_t aioc_pid; /* ID of the waiting task */
|
|
#ifdef CONFIG_PRIORITY_INHERITANCE
|
|
uint8_t aioc_prio; /* Priority of the waiting task */
|
|
#endif
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Public Data
|
|
****************************************************************************/
|
|
|
|
#undef EXTERN
|
|
#if defined(__cplusplus)
|
|
#define EXTERN extern "C"
|
|
extern "C"
|
|
{
|
|
#else
|
|
#define EXTERN extern
|
|
#endif
|
|
|
|
/* This is a list of pending asynchronous I/O. The user must hold the
|
|
* lock on this list in order to access the list.
|
|
*/
|
|
|
|
EXTERN dq_queue_t g_aio_pending;
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: aio_initialize
|
|
*
|
|
* Description:
|
|
* Perform one-time initialization of the asynchronous I/O sub-system
|
|
*
|
|
* Input Parameters:
|
|
* None
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
void aio_initialize(void);
|
|
|
|
/****************************************************************************
|
|
* Name: aio_lock/aio_unlock
|
|
*
|
|
* Description:
|
|
* Take/give the lock on the pending asynchronous I/O list. These locks
|
|
* are implemented with re-entrant semaphores -- deadlocks will not occur
|
|
* if the lock is taken multiple times on the same thread.
|
|
*
|
|
* Input Parameters:
|
|
* None
|
|
*
|
|
* Returned Value:
|
|
* aio_lock() return -ECANCELED if the calling thread is canceled.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int aio_lock(void);
|
|
void aio_unlock(void);
|
|
|
|
/****************************************************************************
|
|
* Name: aioc_alloc
|
|
*
|
|
* Description:
|
|
* Allocate a new AIO container by taking the next, pre-allocated
|
|
* container from the free list. This function will wait until
|
|
* aioc_free() is called in the event that there is no free container
|
|
* available in the free list.
|
|
*
|
|
* Input Parameters:
|
|
* None
|
|
*
|
|
* Returned Value:
|
|
* A reference to the allocated AIO container. This allocation never
|
|
* fails because the logic will wait in the event that there is no free
|
|
* container.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct aio_container_s *aioc_alloc(void);
|
|
|
|
/****************************************************************************
|
|
* Name: aioc_free
|
|
*
|
|
* Description:
|
|
* Free an AIO container by returning it to the free list and, perhaps,
|
|
* awakening any threads waiting for that resource
|
|
*
|
|
* Input Parameters:
|
|
* aioc - The AIO container to be free
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
void aioc_free(FAR struct aio_container_s *aioc);
|
|
|
|
/****************************************************************************
|
|
* 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);
|
|
|
|
/****************************************************************************
|
|
* 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);
|
|
|
|
/****************************************************************************
|
|
* Name: aio_queue
|
|
*
|
|
* Description:
|
|
* Schedule the asynchronous I/O on the low priority work queue
|
|
*
|
|
* Input Parameters:
|
|
* arg - Worker argument. In this case, a pointer to an instance of
|
|
* struct aiocb cast to void *.
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) on success. Otherwise, -1 is returned and the errno is set
|
|
* appropriately.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int aio_queue(FAR struct aio_container_s *aioc, worker_t worker);
|
|
|
|
/****************************************************************************
|
|
* Name: aio_signal
|
|
*
|
|
* Description:
|
|
* Signal the client that an I/O has completed.
|
|
*
|
|
* Input Parameters:
|
|
* pid - ID of the task to signal
|
|
* aiocbp - Pointer to the asynchronous I/O state structure that includes
|
|
* information about how to signal the client
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) if the client was successfully signalled. Otherwise, a
|
|
* negated errno value is returned.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int aio_signal(pid_t pid, FAR struct aiocb *aiocbp);
|
|
|
|
#undef EXTERN
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_FS_AIO */
|
|
#endif /* __FS_AIO_AIO_H */
|