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 bool rt_prio(int prio)
10{
11 return unlikely(prio < MAX_RT_PRIO && prio >= MAX_DL_PRIO);
12}
13
14static inline bool rt_or_dl_prio(int prio)
15{
16 return unlikely(prio < MAX_RT_PRIO);
17}
18
19/*
20 * Returns true if a task has a priority that belongs to RT class. PI-boosted
21 * tasks will return true. Use rt_policy() to ignore PI-boosted tasks.
22 */
23static inline bool rt_task(struct task_struct *p)
24{
25 return rt_prio(prio: p->prio);
26}
27
28/*
29 * Returns true if a task has a priority that belongs to RT or DL classes.
30 * PI-boosted tasks will return true. Use rt_or_dl_task_policy() to ignore
31 * PI-boosted tasks.
32 */
33static inline bool rt_or_dl_task(struct task_struct *p)
34{
35 return rt_or_dl_prio(prio: p->prio);
36}
37
38/*
39 * Returns true if a task has a policy that belongs to RT or DL classes.
40 * PI-boosted tasks will return false.
41 */
42static inline bool rt_or_dl_task_policy(struct task_struct *tsk)
43{
44 int policy = tsk->policy;
45
46 if (policy == SCHED_FIFO || policy == SCHED_RR)
47 return true;
48 if (policy == SCHED_DEADLINE)
49 return true;
50 return false;
51}
52
53#ifdef CONFIG_RT_MUTEXES
54extern void rt_mutex_pre_schedule(void);
55extern void rt_mutex_schedule(void);
56extern void rt_mutex_post_schedule(void);
57
58/*
59 * Must hold either p->pi_lock or task_rq(p)->lock.
60 */
61static inline struct task_struct *rt_mutex_get_top_task(struct task_struct *p)
62{
63 return p->pi_top_task;
64}
65extern void rt_mutex_setprio(struct task_struct *p, struct task_struct *pi_task);
66extern void rt_mutex_adjust_pi(struct task_struct *p);
67#else
68static inline struct task_struct *rt_mutex_get_top_task(struct task_struct *task)
69{
70 return NULL;
71}
72# define rt_mutex_adjust_pi(p) do { } while (0)
73#endif
74
75extern void normalize_rt_tasks(void);
76
77
78/*
79 * default timeslice is 100 msecs (used only for SCHED_RR tasks).
80 * Timeslices get refilled after they expire.
81 */
82#define RR_TIMESLICE (100 * HZ / 1000)
83
84#endif /* _LINUX_SCHED_RT_H */
85

source code of linux/include/linux/sched/rt.h