problem about periodically call a function

[Peng Wang]

Hi All

I write a program in scratch/ folder, which will call function A (eg, print a word)in src/ folder periodically. Through searching the Internet, I find that it can be realized by inserting Simulator::Schedule(call_interval, &function A, this) in function A to call function itself after a specific time. The question is, how I can call function A from my program in scratch/? I have tried something like the following line. "Simulator::Schedule (Seconds (0.0), &ns3::ClassA::functionA)". There is no error during compiling and executing processes. However, no word is printed on my screen. 

Why? Is something wrong with this method? 

Grateful for any assistance!        

[Tommaso Pecorella]

Hi,

if there's no error during compilation/run, then the problem may be in the printing. Isn't it ?

What's inside your functionA ?

T.

[Peng Wang]

Thanks for your time and response!

just one sentence: std::cout << "print word"; Logically, it should be executed periodically, since I have started to execute it at "0.0s" in program in "scratch/".

Is there something wrong with this line: "Simulator::Schedule (Seconds (0.0), &ns3::ClassA::functionA)"?  

By the way, if you want to schedule an event in another program, what you will do?

[Tommaso Pecorella]

"Simulator::Schedule (Seconds (0.0), &ns3::ClassA::functionA)" is correct, but "ns3::ClassA::functionA" must be a static function in the class (you didn't specify the third argument, the instance's pointer).

"std::cout << "print word";" is correct, but you didn't add a newline at the end of it. This may lead to buffer issues: the output will be printed when the program terminates.

Launching a function in another program... no, not possible (if by "program" you mean a different simulation).

T.

[Peng Wang]

Oh, yes. it really helps. They are in different simulations. My idea seems not correct. 

In fact, it is something related to my research. I scheduled an event in program A to make the value of some variables be updated periodically. In Program B, I will start the simulation, and also want to start the event in program A. 

I really have no ideas by now. Can you give me some directions?

Thanks again for your help!