1/* Definitions for POSIX 1003.1b-1993 (aka POSIX.4) scheduling interface.
2 Copyright (C) 1996,1997,1999,2001-2004,2007,2010,2012
3 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
19
20#ifndef _SCHED_H
21#define _SCHED_H 1
22
23#include <features.h>
24
25/* Get type definitions. */
26#include <bits/types.h>
27
28#define __need_size_t
29#include <stddef.h>
30
31#define __need_time_t
32#define __need_timespec
33#include <time.h>
34
35#ifndef __pid_t_defined
36typedef __pid_t pid_t;
37# define __pid_t_defined
38#endif
39
40
41/* Get system specific constant and data structure definitions. */
42#include <bits/sched.h>
43/* Define the real names for the elements of `struct sched_param'. */
44#define sched_priority __sched_priority
45
46
47__BEGIN_DECLS
48
49/* Set scheduling parameters for a process. */
50extern int sched_setparam (__pid_t __pid, const struct sched_param *__param)
51 __THROW;
52
53/* Retrieve scheduling parameters for a particular process. */
54extern int sched_getparam (__pid_t __pid, struct sched_param *__param) __THROW;
55
56/* Set scheduling algorithm and/or parameters for a process. */
57extern int sched_setscheduler (__pid_t __pid, int __policy,
58 const struct sched_param *__param) __THROW;
59
60/* Retrieve scheduling algorithm for a particular purpose. */
61extern int sched_getscheduler (__pid_t __pid) __THROW;
62
63/* Yield the processor. */
64extern int sched_yield (void) __THROW;
65
66/* Get maximum priority value for a scheduler. */
67extern int sched_get_priority_max (int __algorithm) __THROW;
68
69/* Get minimum priority value for a scheduler. */
70extern int sched_get_priority_min (int __algorithm) __THROW;
71
72/* Get the SCHED_RR interval for the named process. */
73extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __THROW;
74
75
76#ifdef __USE_GNU
77/* Access macros for `cpu_set'. */
78# define CPU_SETSIZE __CPU_SETSIZE
79# define CPU_SET(cpu, cpusetp) __CPU_SET_S (cpu, sizeof (cpu_set_t), cpusetp)
80# define CPU_CLR(cpu, cpusetp) __CPU_CLR_S (cpu, sizeof (cpu_set_t), cpusetp)
81# define CPU_ISSET(cpu, cpusetp) __CPU_ISSET_S (cpu, sizeof (cpu_set_t), \
82 cpusetp)
83# define CPU_ZERO(cpusetp) __CPU_ZERO_S (sizeof (cpu_set_t), cpusetp)
84# define CPU_COUNT(cpusetp) __CPU_COUNT_S (sizeof (cpu_set_t), cpusetp)
85
86# define CPU_SET_S(cpu, setsize, cpusetp) __CPU_SET_S (cpu, setsize, cpusetp)
87# define CPU_CLR_S(cpu, setsize, cpusetp) __CPU_CLR_S (cpu, setsize, cpusetp)
88# define CPU_ISSET_S(cpu, setsize, cpusetp) __CPU_ISSET_S (cpu, setsize, \
89 cpusetp)
90# define CPU_ZERO_S(setsize, cpusetp) __CPU_ZERO_S (setsize, cpusetp)
91# define CPU_COUNT_S(setsize, cpusetp) __CPU_COUNT_S (setsize, cpusetp)
92
93# define CPU_EQUAL(cpusetp1, cpusetp2) \
94 __CPU_EQUAL_S (sizeof (cpu_set_t), cpusetp1, cpusetp2)
95# define CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
96 __CPU_EQUAL_S (setsize, cpusetp1, cpusetp2)
97
98# define CPU_AND(destset, srcset1, srcset2) \
99 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, &)
100# define CPU_OR(destset, srcset1, srcset2) \
101 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, |)
102# define CPU_XOR(destset, srcset1, srcset2) \
103 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, ^)
104# define CPU_AND_S(setsize, destset, srcset1, srcset2) \
105 __CPU_OP_S (setsize, destset, srcset1, srcset2, &)
106# define CPU_OR_S(setsize, destset, srcset1, srcset2) \
107 __CPU_OP_S (setsize, destset, srcset1, srcset2, |)
108# define CPU_XOR_S(setsize, destset, srcset1, srcset2) \
109 __CPU_OP_S (setsize, destset, srcset1, srcset2, ^)
110
111# define CPU_ALLOC_SIZE(count) __CPU_ALLOC_SIZE (count)
112# define CPU_ALLOC(count) __CPU_ALLOC (count)
113# define CPU_FREE(cpuset) __CPU_FREE (cpuset)
114
115
116/* Set the CPU affinity for a task */
117extern int sched_setaffinity (__pid_t __pid, size_t __cpusetsize,
118 const cpu_set_t *__cpuset) __THROW;
119
120/* Get the CPU affinity for a task */
121extern int sched_getaffinity (__pid_t __pid, size_t __cpusetsize,
122 cpu_set_t *__cpuset) __THROW;
123#endif
124
125__END_DECLS
126
127#endif /* sched.h */
128