Way of catch dataset is opened or not.

[t_ar_taat]

Is there any way that I can determine whether the dataset is open or not?

For example, If I open the dataset "x" in the work library,which means there is a window which title bar is "VIEWTABLE: work.X".
In this situation,I exist below code

data work.x;
yy = 1;
run;

There's a ERROR log saying "member-level control" etc., you know.

To avoid this, I'm looking for a way to grasp how this data set is open before casting the dataset(work.x) to DATA step.

I know "open" function,which is for open dataset.This time I'm looking "opened" or not.

I asked “Google” but it seems no answer.

Sincerely,

[Reeza · Accepted solution]

The first paper in your google search is appplicable isn't it?

Try to open/lock the file and you'all get an error code if file is already opened. 

The FOPEN function()

[t_ar_taat]

Reeza,Thank  you for your kindness every time.

Oops,actually  if "open" function returns error,it means the dataset is opened.Thanks.

[Patrick]

In case you've started looking into this because you have some sort of a control/log table where multiple processes insert or update in parallel (so only short lock of the table per process) then have also a look into option FileLockWait as this will make the locking issue "go away" for such use cases.

[t_ar_taat]

Thank you,Patrick.
I haven't seen "FILELOCKWAIT" System Option,so I'll check it.