Terminates the current thread.
If another thread is waiting for us using join then the waiting thread will be woken
up and get retval as the return value of join.
Calling exit with a parameter retval is equivalent to returning retval from
the function func, as given to Thread.
You must only call exit from a thread that you created yourself with Thread or related APIs. You must not call this function from a thread created with another threading library or or from within a ThreadPool.
| retval |
the return value of this thread |