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Now if you've been actively thinking about how threads work so far in this lesson, you may be wondering how does the memory for a thread get cleaned up after it is finished, or where does its return value go, or how can I make sure the thread has finished its work before I let the main thread terminate? We'll answer all these questions by looking at the distinction between joinable and detached threads. Let's start by talking about what makes a thread terminate. We'll draw the main thread here on the left, our thread here on the right. And maybe there are some other threads in between. There are really two cases. First, the entire process will terminate if any thread makes a call to exit or if main reaches the end of its code, it's or executes a return statement. Again this will kill all threads associated with the process. The second way our thread might terminate, is if he himself calls either pthread-exit or executes a return statement. The distinction between joinable and and detac