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/*
libaio Linux async I/O interface
Copyright 2002 Red Hat, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _AIO_RING_H
#define _AIO_RING_H
#define AIO_RING_MAGIC 0xa10a10a1
struct aio_ring {
unsigned id; /* kernel internal index number */
unsigned nr; /* number of io_events */
unsigned head;
unsigned tail;
unsigned magic;
unsigned compat_features;
unsigned incompat_features;
unsigned header_length; /* size of aio_ring */
};
static inline int aio_ring_is_empty(io_context_t ctx, struct timespec *timeout)
{
struct aio_ring *ring = (struct aio_ring *)ctx;
if (!ring || ring->magic != AIO_RING_MAGIC)
return 0;
if (!timeout || timeout->tv_sec || timeout->tv_nsec)
return 0;
if (ring->head != ring->tail)
return 0;
return 1;
}
#endif /* _AIO_RING_H */
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