How to response polling event during dll call

Hello,
There is a long time dll call in my program. The program doesn't response to mouse click in the front panel during the dll call when I want to display other page in Tab control. It only response after the call.
How to solve the problem?
Thanks!

Wether or not it is possible to fix this situation is dependent on the dll itself.
IF
the dll is written to be re-entrant (thread-safe)
THEN
you can configure the Call Library function to not run in the user interface thread. This can be done by right-clicking on the node and selecting "configure". In the configure screen, ther is a drop down selection box that defaults to "Run in UI thread". Change this to re-entrant.
You can then determine which thread the dll runs in by setting the properties of the calling VI.
Warning!
If the dll is not re-entrant you WILL experience random crashes and possible data coruption! All bets are of if the dll is used in the wrong manner.
What is happening:
LV's execution systems are multi-thread with the exception
of the UI thread. The UI thread is single threaded to ensure updates of control and indicator information is updated correctly, etc. This thread also uses co-operative multi-tasking wherein a proccess is expected to "put itself to sleep" regularly in order to allow other proccesses in that thread to gain access to the CPU. Your dll is dominating this thread and prevent user actions to be serviced!
Final note;
If you do not know if the dll is thread-safe and decide you just want to experiment,
BACKUP YOUR ENTIRE MACHINE!
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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