So, my daemon is in terrible waters right now. I need help with getting it to at for one of two things to happen. First, I need to wait on libusb for events, either connects/disconnects or data (synchronous) and wait on a socket.

Now, the current idea is to make two threads that have blocking code that wait on each item. Each thread will kill the other when they finish, so waiting on one will let me know of some sort of event.

Second idea is to have the daemon run two threads, one for socket stuff and one for usb stuff. When one has an event, the other thread is suspended until the event is handled.

Any of these sound good? Other ideas I am not seeing?

What do you know about semaphores+mutexes?

Not much. I actually haven't used pthread before until just now, and haven't touched mutes and semaphores. Still trying to learn...

If you learn what they are, you'll be able to answer your own question. And by semaphore, I meant a counting semaphore, since mutexes behave very much like binary semaphores.

Also: http://en.wikipedia.org/wiki/Deadlock#Necessary_conditions

You should try reading The little book of semaphores if you need to learn more about them. The book is free so that should help some.

Rats, you beat me to the party. This is exactly what I was going to suggest. Unfortunately, the TI-83+ lacks an atomic TAS instruction natively, but if you're clever with interrupts, you can easily emulate it.

Daemon as-in a daemon on Linux, not a calc

Also, thanks for the link, I will look at it soon.

<edit>

I added in mutexes, made 2 threads with infinite loops, and made all functions block. Now it runs much better, no cpu usage when nothing is going on