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I know I can do it like you suggested but I have more complicated case. I will try to explain my application more clearly.

I building communication gateway that connects two industrial networks...

It looks like I have a lot of reading to do. I can't afford my self another case of deadlocking. I'll try to write threadsafe application like you suggested. Below is pseudo code of simplified...

Thank you for your reply. I think I have found quicker and safer solution for problem.

I've removed all my code from signal handler and added variable increment.

void timer_handler(int signum)...

I'll try to remove all sem_wait and pthread_create functions from my signal handler, thanks.

You are right about sem_wait(). I didn't know that. I was sure that sem_post() is async-signal safe and that is true. I didn't check for sem_wait().
Below is only a part of my timer_handler...

I have problem with my application. Application is running on embedded Linux machine. It's basically multiprotocol gateway that connects two industrial Ethernet networks.

We are experiencing some...

Yes, client is on known port. I don't have a problem with this part of code, I managed to send and receive in both ways.

Why do you think select is a better choice? I
Thank you for the advice...

Hi everyone,

I'm new to this forum. I'm working on new project for last few days and this forum already helped me on
couple of occasions. I don't have any prior experience with network...