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 static inline bool task_is_realtime(struct task_struct *tsk)
  22 {
  23         int policy = tsk->policy;
  24
  25         if (policy == SCHED_FIFO || policy == SCHED_RR)
  26                 return true;
  27         if (policy == SCHED_DEADLINE)
  28                 return true;
  29         return false;
  30 }
  31
  32 #ifdef CONFIG_RT_MUTEXES
  33 /*
  34  * Must hold either p->pi_lock or task_rq(p)->lock.
  35  */
  36 static inline struct task_struct *rt_mutex_get_top_task(struct task_struct *p)
  37 {
  38         return p->pi_top_task;
  39 }
  40 extern void rt_mutex_setprio(struct task_struct *p, struct task_struct *pi_task);
  41 extern void rt_mutex_adjust_pi(struct task_struct *p);
  42 static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
  43 {
  44         return tsk->pi_blocked_on != NULL;
  45 }
  46 #else
  47 static inline struct task_struct *rt_mutex_get_top_task(struct task_struct *task)
  48 {
  49         return NULL;
  50 }
  51 # define rt_mutex_adjust_pi(p)          do { } while (0)
  52 static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
  53 {
  54         return false;
  55 }
  56 #endif
  57
  58 extern void normalize_rt_tasks(void);
  59
  60
  61 /*
  62  * default timeslice is 100 msecs (used only for SCHED_RR tasks).
  63  * Timeslices get refilled after they expire.
  64  */
  65 #define RR_TIMESLICE            (100 * HZ / 1000)
  66
  67 #endif /* _LINUX_SCHED_RT_H */