thread
    Thread whose scheduling policy and parameters are obtained.
 policy
    Receives the value of the scheduling policy for the thread
    specified in thread. Refer to the description of the pthread_
    setschedparam() routine for valid policies and their meanings.
 param
    Receives the value of the scheduling parameters for the thread
    specified in thread. Refer to the description of the pthread_
    setschedparam() routine for valid values.