Scheduling Policies

int rk_cpu_reserves_set_scheduling_policy(int policy);

Set the reserve scheduling policy; currently supported scheduling policies are:

• 0 $\rightarrow$ Rate Monotonic;
• 1 $\rightarrow$ Deadline Monotonic;
• 2 $\rightarrow$ Earliest Deadline First.

Returns RK_SUCCESS on success and RK_ERROR on failure.

If Earliest Deadline First is selected, the SOFT enforcement mode is implemented as a simplified version of the Constant Bandwidth Server (described in Luca Abeni and Giorgio Buttazzo, ``Integrating Multimedia Applications in Hard Real-Time Systems'', Proceedings of the IEEE Real-Time Systems Symposium, Madrid, Spain, December 1998). Basically, when a reserve finishes the available execution time, the deadline is postponed and tasks' priorities are updated accordingly, but it is not depleted (CBS is work conserving).

int rk_cpu_reserves_get_scheduling_policy(void);

Returns the currently used reserve scheduling policy.