include/linux/sched/rt.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_SCHED_RT_H
   3 #define _LINUX_SCHED_RT_H
   4
   5 #include <linux/sched.h>
   6
   7 struct task_struct;
   8
   9 static inline int rt_prio(int prio)
  10 {
  11         if (unlikely(prio < MAX_RT_PRIO))
  12                 return 1;
  13         return 0;
  14 }
  15
  16 static inline int rt_task(struct task_struct *p)
  17 {
  18         return rt_prio(p->prio);
  19 }
  20
  21 #ifdef CONFIG_RT_MUTEXES
  22 /*
  23  * Must hold either p->pi_lock or task_rq(p)->lock.
  24  */
  25 static inline struct task_struct *rt_mutex_get_top_task(struct task_struct *p)
  26 {
  27         return p->pi_top_task;
  28 }
  29 extern void rt_mutex_setprio(struct task_struct *p, struct task_struct *pi_task);
  30 extern void rt_mutex_adjust_pi(struct task_struct *p);
  31 static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
  32 {
  33         return tsk->pi_blocked_on != NULL;
  34 }
  35 #else
  36 static inline struct task_struct *rt_mutex_get_top_task(struct task_struct *task)
  37 {
  38         return NULL;
  39 }
  40 # define rt_mutex_adjust_pi(p)          do { } while (0)
  41 static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
  42 {
  43         return false;
  44 }
  45 #endif
  46
  47 extern void normalize_rt_tasks(void);
  48
  49
  50 /*
  51  * default timeslice is 100 msecs (used only for SCHED_RR tasks).
  52  * Timeslices get refilled after they expire.
  53  */
  54 #define RR_TIMESLICE            (100 * HZ / 1000)
  55
  56 #endif /* _LINUX_SCHED_RT_H */