pthreads : questions about concurrency and lifetime

Hello once again,
Just wondering about pthreads now. I know that the lifetime (scope) of a regular procedural function in C is simple.. it's from the top of the function body to the bottom of the function body (assuming no infinite loops are injected). Example:

(void*) function(void*) {/* lifetime of function is here. */ }

However looking over pthread(3), there are a number of different functions for killing threads and exiting child threads, in order terminate child threads (and maybe to get back to the main thread of execution in a program).

So my question is, once the end of a function body is reached that was made using pthread_create(), does the thread exit and 'destroy' itself or do I need to do 'manual' cleanup, i.e. run pthread_detach(3), pthread_exit(3), or pthread_kill(3)?

Thanks!
-Garrett
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