The function int pthread_attr_getschedparam(const pthread_attr_t *restrict attr, contst struct sched_param *restrict param); gets the scheduling parameter attributes in the 'attr' argument. The contents of the 'param' structure are defined in sched.h. For the SCHED_FIFO and SCHED_RR policies, the only required member of 'param' is 'sched_priority'. If success, it returns 0;