public unsafe static PosixResult IoSubmit(aio_context_t ctx, int nr, iocb **iocbpp)
{
int rv = io_submit(ctx, nr, iocbpp);
return(PosixResult.FromReturnValue(rv));
}
public unsafe bool ExecuteOperations()
{
List <Operation>?scheduled = _scheduledOperations;
if (scheduled == null)
{
return(false);
}
_scheduledOperations = _cachedOperationsList;
_cachedOperationsList = null;
if (_results == null || _results.Length < scheduled.Count)
{
_results = new AsyncOperationResult[Math.Max(scheduled.Count, 2 * (_results?.Length ?? 0))];
}
AsyncOperationResult[] results = _results;
int queueLength = scheduled.Count;
int queueOffset = 0;
while (queueOffset < queueLength)
{
int nr = Math.Min((queueLength - queueOffset), IocbLength);
try
{
iocb *aioCbs = AioCbs;
for (int i = queueOffset; i < (queueOffset + nr); i++)
{
Operation op = scheduled[i];
int fd = op.Handle.DangerousGetHandle().ToInt32(); // TODO: make safe
MemoryHandle handle = op.Memory.Pin();
_memoryHandles.Add(handle);
aioCbs->aio_fildes = fd;
aioCbs->aio_data = (ulong)i;
aioCbs->aio_lio_opcode = op.IsReadNotWrite ? IOCB_CMD_PREAD : IOCB_CMD_PWRITE;
aioCbs->aio_buf = (ulong)handle.Pointer;
aioCbs->aio_nbytes = (ulong)op.Memory.Length;
aioCbs++;
}
iocb **iocbpp = AioCbsTable;
int toSubmit = nr;
while (toSubmit > 0)
{
int rv = io_submit(_ctx, toSubmit, iocbpp);
if (rv == -1)
{
PlatformException.Throw();
}
int toReceive = rv;
toSubmit -= rv;
iocbpp += rv;
while (toReceive > 0)
{
do
{
rv = IoGetEvents(_ctx, toReceive, AioEvents);
} while (rv == -1 && errno == EINTR);
if (rv == -1)
{
PlatformException.Throw();
}
io_event *events = AioEvents;
for (int i = 0; i < rv; i++)
{
results[(int)events->data] = new AsyncOperationResult(events->res);
events++;
}
toReceive -= rv;
}
}
}
finally
{
foreach (var handle in _memoryHandles)
{
handle.Dispose();
}
_memoryHandles.Clear();
}
// Callbacks
for (int i = queueOffset; i < (queueOffset + nr); i++)
{
Operation op = scheduled[i];
op.Callback(results[i], op.State, op.Data);
}
queueOffset += nr;
}
scheduled.Clear();
if (_scheduledOperations == null)
{
_scheduledOperations = scheduled;
return(false);
}
else
{
_cachedOperationsList = scheduled;
return(_scheduledOperations.Count > 0);
}
}
public static int io_submit(aio_context_t ctx, long_t nr, iocb **iocbpp)
{
int rv = (int)syscall(SYS_io_submit, ctx.ring, nr, iocbpp);
return(rv);
}
