confusion with tryJoin of poco

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C++

Hi. I am new to the usage of poco thread class.

Usecase :
I am using poco tryJoin to wait for some 5 sec..part of code is

if(Thread.tryJoin(5000)) {
   cout<<"stopped thread successfully";
 }
 else 
	cout<<"failed to stop";

Problem:
I see that there is 5 sec delay if the thread failed to stop, where as the delay is not seen in above if case
and the statement "stopped thread successfully" was printed without any delay

why no delay when

tryJoin(5000)

?

Description if tryJoin says that it was for that mill sec

bool tryJoin(long milliseconds);
		/// Waits for at most the given interval for the thread 
		/// to complete. Returns true if the thread has finished,
		/// false otherwise.