1/* Definitions for POSIX 1003.1b-1993 (aka POSIX.4) scheduling interface.
2 Copyright (C) 1996-2014 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#include <stddef.h>
29
30#define __need_time_t
31#define __need_timespec
32#include <time.h>
33
34#ifndef __pid_t_defined
35typedef __pid_t pid_t;
36# define __pid_t_defined
37#endif
38
39
40/* Get system specific constant and data structure definitions. */
41#include <bits/sched.h>
42/* Define the real names for the elements of `struct sched_param'. */
43#define sched_priority __sched_priority
44
45
46__BEGIN_DECLS
47
48/* Set scheduling parameters for a process. */
49extern int sched_setparam (__pid_t __pid, const struct sched_param *__param)
50 __THROW;
51
52/* Retrieve scheduling parameters for a particular process. */
53extern int sched_getparam (__pid_t __pid, struct sched_param *__param) __THROW;
54
55/* Set scheduling algorithm and/or parameters for a process. */
56extern int sched_setscheduler (__pid_t __pid, int __policy,
57 const struct sched_param *__param) __THROW;
58
59/* Retrieve scheduling algorithm for a particular purpose. */
60extern int sched_getscheduler (__pid_t __pid) __THROW;
61
62/* Yield the processor. */
63extern int sched_yield (void) __THROW;
64
65/* Get maximum priority value for a scheduler. */
66extern int sched_get_priority_max (int __algorithm) __THROW;
67
68/* Get minimum priority value for a scheduler. */
69extern int sched_get_priority_min (int __algorithm) __THROW;
70
71/* Get the SCHED_RR interval for the named process. */
72extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __THROW;
73
74
75#ifdef __USE_GNU
76/* Access macros for `cpu_set'. */
77# define CPU_SETSIZE __CPU_SETSIZE
78# define CPU_SET(cpu, cpusetp) __CPU_SET_S (cpu, sizeof (cpu_set_t), cpusetp)
79# define CPU_CLR(cpu, cpusetp) __CPU_CLR_S (cpu, sizeof (cpu_set_t), cpusetp)
80# define CPU_ISSET(cpu, cpusetp) __CPU_ISSET_S (cpu, sizeof (cpu_set_t), \
81 cpusetp)
82# define CPU_ZERO(cpusetp) __CPU_ZERO_S (sizeof (cpu_set_t), cpusetp)
83# define CPU_COUNT(cpusetp) __CPU_COUNT_S (sizeof (cpu_set_t), cpusetp)
84
85# define CPU_SET_S(cpu, setsize, cpusetp) __CPU_SET_S (cpu, setsize, cpusetp)
86# define CPU_CLR_S(cpu, setsize, cpusetp) __CPU_CLR_S (cpu, setsize, cpusetp)
87# define CPU_ISSET_S(cpu, setsize, cpusetp) __CPU_ISSET_S (cpu, setsize, \
88 cpusetp)
89# define CPU_ZERO_S(setsize, cpusetp) __CPU_ZERO_S (setsize, cpusetp)
90# define CPU_COUNT_S(setsize, cpusetp) __CPU_COUNT_S (setsize, cpusetp)
91
92# define CPU_EQUAL(cpusetp1, cpusetp2) \
93 __CPU_EQUAL_S (sizeof (cpu_set_t), cpusetp1, cpusetp2)
94# define CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
95 __CPU_EQUAL_S (setsize, cpusetp1, cpusetp2)
96
97# define CPU_AND(destset, srcset1, srcset2) \
98 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, &)
99# define CPU_OR(destset, srcset1, srcset2) \
100 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, |)
101# define CPU_XOR(destset, srcset1, srcset2) \
102 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, ^)
103# define CPU_AND_S(setsize, destset, srcset1, srcset2) \
104 __CPU_OP_S (setsize, destset, srcset1, srcset2, &)
105# define CPU_OR_S(setsize, destset, srcset1, srcset2) \
106 __CPU_OP_S (setsize, destset, srcset1, srcset2, |)
107# define CPU_XOR_S(setsize, destset, srcset1, srcset2) \
108 __CPU_OP_S (setsize, destset, srcset1, srcset2, ^)
109
110# define CPU_ALLOC_SIZE(count) __CPU_ALLOC_SIZE (count)
111# define CPU_ALLOC(count) __CPU_ALLOC (count)
112# define CPU_FREE(cpuset) __CPU_FREE (cpuset)
113
114
115/* Set the CPU affinity for a task */
116extern int sched_setaffinity (__pid_t __pid, size_t __cpusetsize,
117 const cpu_set_t *__cpuset) __THROW;
118
119/* Get the CPU affinity for a task */
120extern int sched_getaffinity (__pid_t __pid, size_t __cpusetsize,
121 cpu_set_t *__cpuset) __THROW;
122#endif
123
124__END_DECLS
125
126#endif /* sched.h */
127