we have created a dll in c.
From java we are calling that c dll.
The dll is linking and running properly
In the middle of the execution, how we can stop the dll and return the control to java?

What do you mean by "stop the dll"? Is some function in the dll running in a separate thread? Otherwise functions will return when they are done executing...

Best regards,
Lucian

ok,
can we call another function of dll using separate java thread while the execution of first function?

Assuming the first call returned, yes. You can spawn a new Java thread or call a C function that starts its own thread. You will have to rely on the code in the dll to do its own multithreading synchronization though.

Best regards,
Lucian