Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef _SCHED_RT_H
2#define _SCHED_RT_H
3
4/*
5 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
6 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
7 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
8 * values are inverted: lower p->prio value means higher priority.
9 *
10 * The MAX_USER_RT_PRIO value allows the actual maximum
11 * RT priority to be separate from the value exported to
12 * user-space. This allows kernel threads to set their
13 * priority to a value higher than any user task. Note:
14 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
15 */
16
17#define MAX_USER_RT_PRIO 100
18#define MAX_RT_PRIO MAX_USER_RT_PRIO
19
20#define MAX_PRIO (MAX_RT_PRIO + 40)
21#define DEFAULT_PRIO (MAX_RT_PRIO + 20)
22
23static inline int rt_prio(int prio)
24{
25 if (unlikely(prio < MAX_RT_PRIO))
26 return 1;
27 return 0;
28}
29
30static inline int rt_task(struct task_struct *p)
31{
32 return rt_prio(p->prio);
33}
34
35#ifdef CONFIG_RT_MUTEXES
36extern int rt_mutex_getprio(struct task_struct *p);
37extern void rt_mutex_setprio(struct task_struct *p, int prio);
38extern void rt_mutex_adjust_pi(struct task_struct *p);
39static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
40{
41 return tsk->pi_blocked_on != NULL;
42}
43#else
44static inline int rt_mutex_getprio(struct task_struct *p)
45{
46 return p->normal_prio;
47}
48# define rt_mutex_adjust_pi(p) do { } while (0)
49static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
50{
51 return false;
52}
53#endif
54
55extern void normalize_rt_tasks(void);
56
57
58/*
59 * default timeslice is 100 msecs (used only for SCHED_RR tasks).
60 * Timeslices get refilled after they expire.
61 */
62#define RR_TIMESLICE (100 * HZ / 1000)
63
64#endif /* _SCHED_RT_H */