LXR linux/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
   7struct task_struct;
   8
   9static inline int rt_prio(int prio)
  10{
  11        if (unlikely(prio < MAX_RT_PRIO))
  12                return 1;
  13        return 0;
  14}
  15
  16static 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 */
  25static inline struct task_struct *rt_mutex_get_top_task(struct task_struct *p)
  26{
  27        return p->pi_top_task;
  28}
  29extern void rt_mutex_setprio(struct task_struct *p, struct task_struct *pi_task);
  30extern void rt_mutex_adjust_pi(struct task_struct *p);
  31static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
  32{
  33        return tsk->pi_blocked_on != NULL;
  34}
  35#else
  36static 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)
  41static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
  42{
  43        return false;
  44}
  45#endif
  46
  47extern 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 */
  57