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#ifndef LITMUS_H
#define LITMUS_H
#include <sys/types.h>
/* This flag is needed to start new RT tasks in STOPPED state */
/* Task is going to run in realtime mode */
#define CLONE_REALTIME 0x10000000
typedef int (*rt_fn_t)(void*);
/* Litmus scheduling policies */
typedef enum {
SCHED_LINUX = 0,
SCHED_PFAIR = 1,
SCHED_PFAIR_STAGGER = 2,
SCHED_PART_EDF = 3,
SCHED_PART_EEVDF = 4,
SCHED_GLOBAL_EDF = 5,
SCHED_PFAIR_DESYNC = 6,
SCHED_GLOBAL_EDF_NP = 7,
SCHED_CUSTOM = 8,
SCHED_EDF_HSB = 9,
SCHED_GSN_EDF = 10
} spolicy;
/* different types of clients */
typedef enum {
RT_CLASS_HARD,
RT_CLASS_SOFT,
RT_CLASS_BEST_EFFORT
} task_class_t;
/* Task RT params for schedulers */
/* RT task parameters for scheduling extensions
* These parameters are inherited during clone and therefore must
* be explicitly set up before the task set is launched.
*/
typedef struct rt_param {
/* Execution cost */
unsigned long exec_cost;
/* Period */
unsigned long period;
/* Partition */
unsigned int cpu;
/* type of task */
task_class_t cls;
} rt_param_t;
typedef int sema_id; /* ID of a semaphore in the Linux kernel */
typedef int pi_sema_id; /* ID of a PI semaphore in the Linux kernel */
#define set_param(t,p,e) do{\
(t).is_realtime=1;\
(t).exec_cost=(e);\
(t).period=(p);\
}while(0);
/* scheduler modes */
#define MODE_NON_RT 0
#define MODE_RT_RUN 1
spolicy sched_setpolicy(spolicy policy);
spolicy sched_getpolicy(void);
int set_rt_mode(int mode);
int set_rt_task_param(pid_t pid, rt_param_t* param);
int get_rt_task_param(pid_t pid, rt_param_t* param);
int prepare_rt_task(pid_t pid);
int tear_down_task(pid_t pid, int sig);
int reset_stat(void);
int sleep_next_period(void);
int scheduler_setup(int cmd, void* param);
int enter_np(void);
int exit_np(void);
int pi_sema_init(void);
int pi_down(pi_sema_id sem_id);
int pi_up(pi_sema_id sem_id);
int pi_sema_free(pi_sema_id sem_id);
int sema_init(void);
int down(sema_id sem_id);
int up(sema_id sem_id);
int sema_free(sema_id sem_id);
/* library functions */
int create_rt_task(rt_fn_t rt_prog, void *arg, int cpu, int wcet, int period);
int __create_rt_task(rt_fn_t rt_prog, void *arg, int cpu, int wcet,
int period, task_class_t cls);
const char* get_scheduler_name(spolicy scheduler);
void show_rt_param(rt_param_t* tp);
task_class_t str2class(const char* str);
#endif
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