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/*
* 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.com/license/LICENSE.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <aio.h>
#include <rtems/posix/aio_misc.h>
#include <errno.h>
#include <stdlib.h>
#include <rtems/system.h>
#include <rtems/seterr.h>
/*
* aio_cancel
*
* Cancel an asynchronous I/O request
*
* Input parameters:
* fildes - file descriptor
* aiocbp - asynchronous I/O control block
*
* Output parameters:
* AIO_CANCELED - if the requested operation(s)
* were canceled
* AIO_NOTCANCELED - if at least one of the requested
* operation(s) cannot be canceled
*/
int aio_cancel(int fildes, struct aiocb *aiocbp)
{
rtems_aio_request_chain *r_chain;
int result;
pthread_mutex_lock (&aio_request_queue.mutex);
if (aiocbp == NULL)
{
if (fcntl (fildes, F_GETFL) < 0)
rtems_set_errno_and_return_minus_one (EBADF);
r_chain = rtems_aio_search_fd (&aio_request_queue.work_req,
fildes,
0);
if (r_chain == NULL)
{
if (!rtems_chain_is_empty (&aio_request_queue.idle_req))
{
r_chain = rtems_aio_search_fd (&aio_request_queue.idle_req,
fildes,
0);
if (r_chain == NULL)
return AIO_ALLDONE;
rtems_chain_extract (&r_chain->next_fd);
rtems_aio_remove_fd (r_chain);
pthread_mutex_destroy (&r_chain->mutex);
pthread_cond_destroy (&r_chain->mutex);
free (r_chain);
pthread_mutex_unlock (&aio_request_queue.mutex);
return AIO_CANCELED;
}
pthread_mutex_unlock (&aio_request_queue.mutex);
return AIO_ALLDONE;
}
pthread_mutex_lock (&r_chain->mutex);
rtems_chain_extract (&r_chain->next_fd);
rtems_aio_remove_fd (r_chain);
pthread_mutex_unlock (&r_chain->mutex);
pthread_mutex_unlock (&aio_request_queue.mutex);
return AIO_CANCELED;
}
else
{
if (aiocbp->aio_fildes != fildes)
{
pthread_mutex_unlock (&aio_request_queue.mutex);
rtems_set_errno_and_return_minus_one (EINVAL);
}
r_chain = rtems_aio_search_fd (&aio_request_queue.work_req,
fildes,
0);
if (r_chain == NULL)
if (!rtems_chain_is_empty (&aio_request_queue.idle_req))
{
r_chain = rtems_aio_search_fd (&aio_request_queue.idle_req,
fildes,
0);
if (r_chain == NULL)
{
pthread_mutex_unlock (&aio_request_queue.mutex);
rtems_set_errno_and_return_minus_one (EINVAL);
}
result = rtems_aio_remove_req (&r_chain->next_fd, aiocbp);
pthread_mutex_unlock (&aio_request_queue.mutex);
return result;
}
pthread_mutex_lock (&r_chain->mutex);
result = rtems_aio_remove_req (&r_chain->next_fd, aiocbp);
pthread_mutex_unlock (&r_chain->mutex);
pthread_mutex_unlock (&aio_request_queue.mutex);
return result;
}
return AIO_ALLDONE;
}
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