public CallbackInfo AddCallback(int gpio, Edge edge, GpioCallback callback)
{
List <CallbackInfo> callbacks;
lock (this.m_callbacks)
{
if (this.m_callbacks.ContainsKey(gpio))
{
callbacks = this.m_callbacks[gpio];
}
else
{
short ret = PiGpioNativeMethods.SetAlertFunc((ushort)gpio, this.GpioAlertCallback);
if (ret < 0)
{
throw new PiGPIOException(ret);
}
callbacks = new List <CallbackInfo>();
this.m_callbacks.Add(gpio, callbacks);
}
}
CallbackInfo cbi = new CallbackInfo((uint)gpio, 0, edge, callback);
lock (callbacks)
{
callbacks.Add(cbi);
}
return(cbi);
}