The function int pthread_join(pthread_t thread, void **value_ptr); shall suspend the execution of the calling thread until the target 'thread' terminates, unless 'thread' has already terminated. On return from a successful pthread_join() call with a non-NULL 'value_ptr' argument, the value passed to pthread_exit() by the terminating thread shall be made available in the location referenced by 'value_ptr'. When pthread_join() returns successfully, the target thread has been terminated. If the thread calling pthread_join() is canceled, then the target thread shall not be detached. Upon successful completion, it returns 0; pthread_join() SHALL fail if: -[ESRCH] No thread could be found corresponding to that thread ID pthread_join() MAY fail if: -[EINVAL] The implementation has detected that the value specified by 'thread' does not refer to a joinable thread. -[EDEADLK] A deadlock was detected or the value of 'thread' specifies the calling thread. It shall not return an error code of [EINTR]