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/**
* @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>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#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/system.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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