1/* Definitions for POSIX 1003.1b-1993 (aka POSIX.4) scheduling interface.
2 Copyright (C) 1996-2017 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#ifndef _SCHED_H
20#define _SCHED_H 1
21
22#include <features.h>
23
24/* Get type definitions. */
25#include <bits/types.h>
26
27#define __need_size_t
28#define __need_NULL
29#include <stddef.h>
30
31#include <bits/types/time_t.h>
32#include <bits/types/struct_timespec.h>
33#ifndef __USE_XOPEN2K
34# include <time.h>
35#endif
36
37#ifndef __pid_t_defined
38typedef __pid_t pid_t;
39# define __pid_t_defined
40#endif
41
42
43/* Get system specific constant and data structure definitions. */
44#include <bits/sched.h>
45/* Define the real names for the elements of `struct sched_param'. */
46#define sched_priority __sched_priority
47
48
49__BEGIN_DECLS
50
51/* Set scheduling parameters for a process. */
52extern int sched_setparam (__pid_t __pid, const struct sched_param *__param)
53 __THROW;
54
55/* Retrieve scheduling parameters for a particular process. */
56extern int sched_getparam (__pid_t __pid, struct sched_param *__param) __THROW;
57
58/* Set scheduling algorithm and/or parameters for a process. */
59extern int sched_setscheduler (__pid_t __pid, int __policy,
60 const struct sched_param *__param) __THROW;
61
62/* Retrieve scheduling algorithm for a particular purpose. */
63extern int sched_getscheduler (__pid_t __pid) __THROW;
64
65/* Yield the processor. */
66extern int sched_yield (void) __THROW;
67
68/* Get maximum priority value for a scheduler. */
69extern int sched_get_priority_max (int __algorithm) __THROW;
70
71/* Get minimum priority value for a scheduler. */
72extern int sched_get_priority_min (int __algorithm) __THROW;
73
74/* Get the SCHED_RR interval for the named process. */
75extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __THROW;
76
77
78#ifdef __USE_GNU
79/* Access macros for `cpu_set'. */
80# define CPU_SETSIZE __CPU_SETSIZE
81# define CPU_SET(cpu, cpusetp) __CPU_SET_S (cpu, sizeof (cpu_set_t), cpusetp)
82# define CPU_CLR(cpu, cpusetp) __CPU_CLR_S (cpu, sizeof (cpu_set_t), cpusetp)
83# define CPU_ISSET(cpu, cpusetp) __CPU_ISSET_S (cpu, sizeof (cpu_set_t), \
84 cpusetp)
85# define CPU_ZERO(cpusetp) __CPU_ZERO_S (sizeof (cpu_set_t), cpusetp)
86# define CPU_COUNT(cpusetp) __CPU_COUNT_S (sizeof (cpu_set_t), cpusetp)
87
88# define CPU_SET_S(cpu, setsize, cpusetp) __CPU_SET_S (cpu, setsize, cpusetp)
89# define CPU_CLR_S(cpu, setsize, cpusetp) __CPU_CLR_S (cpu, setsize, cpusetp)
90# define CPU_ISSET_S(cpu, setsize, cpusetp) __CPU_ISSET_S (cpu, setsize, \
91 cpusetp)
92# define CPU_ZERO_S(setsize, cpusetp) __CPU_ZERO_S (setsize, cpusetp)
93# define CPU_COUNT_S(setsize, cpusetp) __CPU_COUNT_S (setsize, cpusetp)
94
95# define CPU_EQUAL(cpusetp1, cpusetp2) \
96 __CPU_EQUAL_S (sizeof (cpu_set_t), cpusetp1, cpusetp2)
97# define CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
98 __CPU_EQUAL_S (setsize, cpusetp1, cpusetp2)
99
100# define CPU_AND(destset, srcset1, srcset2) \
101 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, &)
102# define CPU_OR(destset, srcset1, srcset2) \
103 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, |)
104# define CPU_XOR(destset, srcset1, srcset2) \
105 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, ^)
106# define CPU_AND_S(setsize, destset, srcset1, srcset2) \
107 __CPU_OP_S (setsize, destset, srcset1, srcset2, &)
108# define CPU_OR_S(setsize, destset, srcset1, srcset2) \
109 __CPU_OP_S (setsize, destset, srcset1, srcset2, |)
110# define CPU_XOR_S(setsize, destset, srcset1, srcset2) \
111 __CPU_OP_S (setsize, destset, srcset1, srcset2, ^)
112
113# define CPU_ALLOC_SIZE(count) __CPU_ALLOC_SIZE (count)
114# define CPU_ALLOC(count) __CPU_ALLOC (count)
115# define CPU_FREE(cpuset) __CPU_FREE (cpuset)
116
117
118/* Set the CPU affinity for a task */
119extern int sched_setaffinity (__pid_t __pid, size_t __cpusetsize,
120 const cpu_set_t *__cpuset) __THROW;
121
122/* Get the CPU affinity for a task */
123extern int sched_getaffinity (__pid_t __pid, size_t __cpusetsize,
124 cpu_set_t *__cpuset) __THROW;
125#endif
126
127__END_DECLS
128
129#endif /* sched.h */
130