All Pipe instances are busy : Error 231

[babncpp]

Hi,
I got a problem with interprocess communication.

I am working on a project using named pipes for Server/Client communication.

Server:
Creates named pipe.
Reads Events.

Client:
Connects to the named pipe.
Sends Events.

Test procedure:
step1: Run server.exe, it creates a named pipe.
step2: Run Client.exe, it connects to named pipe and sends the events.
Observation: server.exe receives the events sent by Client.exe.
step3: close the client.exe.
step4: Run Client.exe again.
Obseration: Error 231( All pipe instances are busy).

Note: server.exe is never closed.

The code in the Client.exe has been confirmed to close pipe and disconnect pipe as below code.

closeStatus = DisconnectNamedPipe(h_HandlePipe);
closeStatus = CloseHandle(h_HandlePipe);


Please help to overcome this issue.

Thanks,
Bab

[Computergeek01]

I'm pretty sure that after the client closes the pipe it was using the server has to open a new one in order to except a new connection.

[babncpp]

Hi Computergeek,

Thanks for your reply.
Yes, the server has to be forcefully open again in order to establish connection with the client.
Is there a way I could implement so that the server is just opened once to connect to client multiple times?

Thanks,
Bab

[webJose]

Yes, there is. I don't remember. Maybe Computergeek01 does, however.

I remember you listen with one thread, and you then accept with other threads. Or maybe the listening thread accepts and processes and a new listening thread is open? Either way you need multiple threads.

[Computergeek01]

I vaugley remember reading something like that but I couldn't get it to work. I have a bad habit of destroying notes\projects that don't go anywhere when I get too frustrated. I like webJose's idea though, that sounds like the way I would go about doing it.