The function int pthread_attr_setdetachstate(const pthread_attr_t *attr, int *detachstate) sets the detachstate attribute in the 'attr' object. The detach state can be either PTHREAD_CREATE_DETACHED or PTHEAD_CREATE_JOINABLE. A value of PTHREAD_CREATE_DETACHED causes all threads created with 'attr' to be in a detached state, and using a value of PTHREAD_CREATE_JOINABLE causes threads created with 'attr' to be in the joinable state. The default value of the detachstate attribute is PTHREAD_CREATE_JOINABLE. If the thread is created detached, then use of the ID of the newly created thread by the pthread_detach() or pthread_join() function will producer an error. If success, it returns 0. It shall fail if: -[EINVAL] The value of detachstate was invalid