linux/include/linux/sched/rt.h
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   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
  21static 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 */
  36static inline struct task_struct *rt_mutex_get_top_task(struct task_struct *p)
  37{
  38        return p->pi_top_task;
  39}
  40extern void rt_mutex_setprio(struct task_struct *p, struct task_struct *pi_task);
  41extern void rt_mutex_adjust_pi(struct task_struct *p);
  42static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
  43{
  44        return tsk->pi_blocked_on != NULL;
  45}
  46#else
  47static 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)
  52static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
  53{
  54        return false;
  55}
  56#endif
  57
  58extern 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 */
  68
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