The idea is that you only pass the address of the current channel data
structure:
&(pid_array[num])
e.g. &(pid_array[0]) then &(pid_array[1]), etc
This way each function will only access it's own data.
If you need to access some other data then you need to pass
&(pid_array), and handle the channel number in some other way.
Regards,
Alex
----- Original Message -----
From: "Xuecheng Xi" <[EMAIL PROTECTED]>
To: "emc-developers" <emc-developers@lists.sourceforge.net>
Sent: Sunday, April 01, 2007 10:59 AM
Subject: [Emc-developers] get channel number from real time thread
function
> Dear Developers,
>
> I am writing a real time thread function in which I need to use the
> channel number. Take pid.c as an example, the number of channel =
> num_chan. For each channel, we have exported
>
> calc_pid(void* arg, long period).
>
> by using
>
> hal_export_funct(bu, calc_pid, &(pid_array[num]), 1, 0, comp_id).
>
> My question is in the function of calc_pid(void* arg, long period),
> how can I know for which channel I am doing the calculations. As
> from
> the arguments (void* arg, long period), there is no information
> regarding the number of channel.
>
> regards
> Xuecheng
>
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