How to set the deadline scheduler (SCHED_DEADLINE) in application code

Issue

• sched_setattr() and sched_getattr() is provided in RHEL 8 kernel. However, calling this in application is failing and showing errors similar to the below:

test.c:133:20: error: storage size of ‘myattr’ isn’t known
  struct sched_attr myattr;
                    ^~~~~~
test.c:151:10: warning: implicit declaration of function ‘sched_setattr’; did you mean ‘sched_setparam’? [-Wimplicit-function-declaration]
    ret = sched_setattr(cpid, &myattr, flags); /* Set scheduling for the new child */
          ^~~~~~~~~~~~~
          sched_setparam