Task <int> DoSocketOpAsync(SocketIO.SocketOp op, Oars.Events events, byte[] buffer, int offset, int size)
{
lock (this)
{
if (_socket == IntPtr.Zero)
{
throw new InvalidOperationException("Socket is closed or disposed");
}
var segment = new ArraySegment <byte> (buffer, offset, size);
var read = op(_socket, segment, SocketIO.MSG_DONTWAIT);
if (read == -1)
{
var errno = Marshal.GetLastWin32Error();
if (errno != Errno.EAGAIN)
{
if (errno == Errno.EPIPE && events == Oars.Events.EV_READ)
{
return(TaskFromResult(0));
}
throw new IOException("Error #" + errno + " on socket");
}
var tcs = new TaskCompletionSource <int> ();
CallMeOnEvent(events, () =>
{
read = op(_socket, segment, SocketIO.MSG_DONTWAIT);
if (read != -1)
{
tcs.SetResult(read);
return;
}
errno = Marshal.GetLastWin32Error();
if (errno == Errno.EPIPE && events == Oars.Events.EV_READ)
{
tcs.SetResult(0);
}
else
{
tcs.SetException(new IOException("Error #" + errno + " on socket"));
}
});
return(tcs.Task);
}
else
{
return(TaskFromResult(read));
}
}
}
Task <int> DoSocketOpAsyncWithCheck(SocketIO.SocketOp op, Oars.Events events, byte[] buffer, int offset, int size)
{
lock (this)
{
if (_busy)
{
throw new InvalidOperationException("Busy");
}
_busy = true;
}
return(DoSocketOpAsync(op, events, buffer, offset, size).ContinueWith(t =>
{
lock (this)
{
_busy = false;
}
return TaskFromResult(t.Result);
}).Unwrap());
}
