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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @brief POSIX Asynchronous Input and Output Private Support
*
* This defines private information for the AIO implementation.
*/
/*
* Copyright 2010, Alin Rus <alin.codejunkie@gmail.com>
*
* 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.
*
* 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.
*/
#ifndef _AIO_MISC_H
#define _AIO_MISC_H
#include <stdio.h>
#include <string.h>
#include <aio.h>
#include <pthread.h>
#include <rtems.h>
#include <rtems/chain.h>
#include <rtems/seterr.h>
#ifdef __cplusplus
extern "C"
{
#endif
/* Actual request being processed */
typedef struct
{
rtems_chain_node next_prio; /* chain requests in order of priority */
int policy; /* If _POSIX_PRIORITIZED_IO and
_POSIX_PRIORITY_SCHEDULING are defined */
int priority; /* see above */
pthread_t caller_thread; /* used for notification */
struct aiocb *aiocbp; /* aio control block */
} rtems_aio_request;
typedef struct
{
rtems_chain_node next_fd; /* order fd chains in queue */
rtems_chain_control perfd; /* chain of requests for this fd */
int fildes; /* file descriptor to be processed */
int new_fd; /* if this is a newly created chain */
pthread_mutex_t mutex;
pthread_cond_t cond;
} rtems_aio_request_chain;
typedef struct
{
pthread_mutex_t mutex;
pthread_cond_t new_req;
pthread_attr_t attr;
rtems_chain_control work_req; /* chains being worked by active threads */
rtems_chain_control idle_req; /* fd chains waiting to be processed */
unsigned int initialized; /* specific value if queue is initialized */
int active_threads; /* the number of active threads */
int idle_threads; /* number of idle threads */
} rtems_aio_queue;
extern rtems_aio_queue aio_request_queue;
#define AIO_QUEUE_INITIALIZED 0xB00B
#ifndef AIO_MAX_THREADS
#define AIO_MAX_THREADS 5
#endif
#ifndef AIO_MAX_QUEUE_SIZE
#define AIO_MAX_QUEUE_SIZE 30
#endif
int rtems_aio_init (void);
int rtems_aio_enqueue (rtems_aio_request *req);
rtems_aio_request_chain *rtems_aio_search_fd
(
rtems_chain_control *chain,
int fildes,
int create
);
void rtems_aio_remove_fd (rtems_aio_request_chain *r_chain);
int rtems_aio_remove_req (rtems_chain_control *chain,
struct aiocb *aiocbp);
#ifdef RTEMS_DEBUG
#include <assert.h>
#define AIO_assert(_x) assert(_x)
#define AIO_printf(_x) printf(_x)
#else
#define AIO_assert(_x)
#define AIO_printf(_x)
#endif
#define rtems_aio_set_errno_return_minus_one( _error, _aiocbp ) \
do { (_aiocbp)->error_code = (_error); \
(_aiocbp)->return_value = -1; \
rtems_set_errno_and_return_minus_one (_error);} while(0)
#ifdef __cplusplus
}
#endif
#endif
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