How to use signal or something to handle async function call?

BJT (2)
Hi, I'm a newbie in C++. It would be appreciated if some one could help on this. Sample code snip should be very helpful. I have an existing client-server code for Linux. The client code contains two classes, A and B. B is a callback class. Both A and B run in the same thread. Function callOneServerFunc() returns before the server calls the callback function in class B. The client code looks something like: class A { public: void callServer(); }; A::callServer() { B *callbackListener = new B(this); //serverPtr below is a handle to the server. Once server completes its job, //it uses the passed callbackListener to call back to //B::itIsCalledBackFromServer() serverPtr->callOneServerFunc(callbackListener); //How can I wait here until the server calls back //to B::itIsCalledBackFromServer()? I guess I need to //use signal somehow but not sure exactly how. //Do other things } class B { public: //This function is called by the server once server //completes its job void itIsCalledBackFromServer(); { //Do something here. } }; I guess I need to use signal to handle the desired control but don't know how exactly. Your help would be highly appreciated. Thanks, BJ

kbw (3827)
https://computing.llnl.gov/tutorials/pthreads/#ConVarSignal