Socket between two threads

I'm not sure this is even possible, but I am hoping there may be some way to do this:

I have two threads in a single application. One is an application that I am developing connects via a socket to another system running some other software. I am writing a simulator to provide a means of testing my application without having access to the other system (which I rarely have access to).

I want the simulator to be completely transparent, but I want to be able to control it within my application to ease development (e.g. I simply want a tab in my GUI to control this simulator). What I mean is the simulator and the application MUST communicate via a socket.

The issue is that sockets are designed for communication between two different processes. Can I use a socket between the app thread and the simulator thread in my single process?

Jul 17 '08 #1

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5121

fantasticamir

have you ever tried? I do not see any problem that you can't. You may use the network socket for sure for this in C++. One of them is listening on a specific port and the other one send messages to that port... as long as you have not both threads listening on same port things should be fine I suppose.

Jul 17 '08 #2

jhaws

Okay, to answer my own question:

I tried creating two threads in a single application, created the socket, and tried to write to and read from the socket.

The results were not good. Writing to the socket or reading from the socket caused the program to crash. It looks like I won't be able to do this.

If anyone has gotten this to work, please let me know. Otherwise I am off to find an alternate solution.

Jul 17 '08 #3

Banfa

9,065

Expert Mod 8TB

I have to say that when I write a simulator for a server application that my program is going to talk to I generally write a separate program. I mean the actual application will not need that simulator code 99% of the time it is in use so why burden it and bloat it by putting it in the same application/process.

Create a separate application to be the simulator.

However if you really want to go ahead with a single application then this

I tried creating two threads in a single application, created the socket, and tried to write to and read from the socket.

is wrong. Don't create a single socket and try to read and write from it that isn't how sockets work.

You need to create 2 sockets, first create the listen socket (for the server sim), then create the application socket and use it to connect to the listening socket.

Jul 18 '08 #4

jhaws

Create a separate application to be the simulator.

I agree with that. However, in this case the simulator is what our company will use to test our application because we only have access to the real system about once or twice a year (we are in Utah and it is in Virginia). For this reason I was hoping to make the simulator a subset of the application.

However, I think found a workaround. The simulator will be a separate application, but I think I am going to simply spawn another process from the main application when I need to run the simulator. That way I still have control of the simulator from the main user interface, but the socket problem is a lot easier.

Thanks for the help!

Jul 18 '08 #5

gpraghuram

1,275

Expert 1GB

If you create a detached thread and inside the thread fnction you open a socket and handle the communication i think it will be fine.
Also i have tried multi-threaded program with socket and i havent found tis type of issue

Raghu

Jul 21 '08 #6

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