Problems with using same socket in different threads

I have server which listens to a port in the main thread. Once it receives something, it creates a new thread. I am able to send a message from the new thread to the same socket but i am not able to receive messages on the same socket in the new thread.
When i send a message from a client to the server, i am not able to get the message in the new thread when i call recvfrom(). I added recvfrom() to the main thread and i was able to get the messages. So, the messages can be read by the main thread but not by the newly created threads.

How can i allow the new threads to receive message on the same socket? Any ideas?

I am pretty sure you have to make a mistake in your program. Creating threads which handle the clients connections is typical solution. And there is no problem with socket communication.

Are you using stream or datagram sockets? I'm pretty sure recvfrom is for datagram sockets, so if you're using a stream socket (SOCK_STREAM) I don't think it will work.

How do you know that the send operations work? An error should show up as a (ssize_t) -1, which can't be detected with !, in case that's how you're checking.
ta0kira

Originally Posted by dorian33 I am pretty sure you have to make a mistake in your program. Creating threads which handle the clients connections is typical solution. And there is no problem with socket communication.

Ah, you are right. The problem was in my code. I was using recvfrom() in my main thread. So, when i added recvfrom() in the new thread, it failed to get any messages as all messages were already getting read by the recvfrom() in the main thread. Now, i have put a check in the main thread, so it is called only when my new thread is not executing.

Thanks for the help!