1/* Definitions for POSIX 1003.1b-1993 (aka POSIX.4) scheduling interface. 
2 Copyright (C) 1996-2022 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 <https://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/* Get system specific constant and data structure definitions. */ 
43#include <bits/sched.h> 
44#include <bits/cpu-set.h> 
45 
46/* Backward compatibility. */ 
47#define sched_priority sched_priority 
48#define __sched_priority sched_priority 
49 
50 
51__BEGIN_DECLS 
52 
53/* Set scheduling parameters for a process. */ 
54extern int sched_setparam (__pid_t __pid, const struct sched_param *__param) 
55 __THROW; 
56 
57/* Retrieve scheduling parameters for a particular process. */ 
58extern int sched_getparam (__pid_t __pid, struct sched_param *__param) __THROW; 
59 
60/* Set scheduling algorithm and/or parameters for a process. */ 
61extern int sched_setscheduler (__pid_t __pid, int __policy, 
62 const struct sched_param *__param) __THROW; 
63 
64/* Retrieve scheduling algorithm for a particular purpose. */ 
65extern int sched_getscheduler (__pid_t __pid) __THROW; 
66 
67/* Yield the processor. */ 
68extern int sched_yield (void) __THROW; 
69 
70/* Get maximum priority value for a scheduler. */ 
71extern int sched_get_priority_max (int __algorithm) __THROW; 
72 
73/* Get minimum priority value for a scheduler. */ 
74extern int sched_get_priority_min (int __algorithm) __THROW; 
75 
76/* Get the SCHED_RR interval for the named process. */ 
77#ifndef __USE_TIME_BITS64 
78extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __THROW; 
79#else 
80# ifdef __REDIRECT_NTH 
81extern int __REDIRECT_NTH (sched_rr_get_interval, 
82 (__pid_t __pid, struct timespec *__t), 
83 __sched_rr_get_interval64); 
84# else 
85# define sched_rr_get_interval __sched_rr_get_interval64 
86# endif 
87#endif 
88 
89#ifdef __USE_GNU 
90/* Access macros for `cpu_set'. */ 
91# define CPU_SETSIZE __CPU_SETSIZE 
92# define CPU_SET(cpu, cpusetp) __CPU_SET_S (cpu, sizeof (cpu_set_t), cpusetp) 
93# define CPU_CLR(cpu, cpusetp) __CPU_CLR_S (cpu, sizeof (cpu_set_t), cpusetp) 
94# define CPU_ISSET(cpu, cpusetp) __CPU_ISSET_S (cpu, sizeof (cpu_set_t), \ 
95 cpusetp) 
96# define CPU_ZERO(cpusetp) __CPU_ZERO_S (sizeof (cpu_set_t), cpusetp) 
97# define CPU_COUNT(cpusetp) __CPU_COUNT_S (sizeof (cpu_set_t), cpusetp) 
98 
99# define CPU_SET_S(cpu, setsize, cpusetp) __CPU_SET_S (cpu, setsize, cpusetp) 
100# define CPU_CLR_S(cpu, setsize, cpusetp) __CPU_CLR_S (cpu, setsize, cpusetp) 
101# define CPU_ISSET_S(cpu, setsize, cpusetp) __CPU_ISSET_S (cpu, setsize, \ 
102 cpusetp) 
103# define CPU_ZERO_S(setsize, cpusetp) __CPU_ZERO_S (setsize, cpusetp) 
104# define CPU_COUNT_S(setsize, cpusetp) __CPU_COUNT_S (setsize, cpusetp) 
105 
106# define CPU_EQUAL(cpusetp1, cpusetp2) \ 
107 __CPU_EQUAL_S (sizeof (cpu_set_t), cpusetp1, cpusetp2) 
108# define CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \ 
109 __CPU_EQUAL_S (setsize, cpusetp1, cpusetp2) 
110 
111# define CPU_AND(destset, srcset1, srcset2) \ 
112 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, &) 
113# define CPU_OR(destset, srcset1, srcset2) \ 
114 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, |) 
115# define CPU_XOR(destset, srcset1, srcset2) \ 
116 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, ^) 
117# define CPU_AND_S(setsize, destset, srcset1, srcset2) \ 
118 __CPU_OP_S (setsize, destset, srcset1, srcset2, &) 
119# define CPU_OR_S(setsize, destset, srcset1, srcset2) \ 
120 __CPU_OP_S (setsize, destset, srcset1, srcset2, |) 
121# define CPU_XOR_S(setsize, destset, srcset1, srcset2) \ 
122 __CPU_OP_S (setsize, destset, srcset1, srcset2, ^) 
123 
124# define CPU_ALLOC_SIZE(count) __CPU_ALLOC_SIZE (count) 
125# define CPU_ALLOC(count) __CPU_ALLOC (count) 
126# define CPU_FREE(cpuset) __CPU_FREE (cpuset) 
127 
128 
129/* Set the CPU affinity for a task */ 
130extern int sched_setaffinity (__pid_t __pid, size_t __cpusetsize, 
131 const cpu_set_t *__cpuset) __THROW; 
132 
133/* Get the CPU affinity for a task */ 
134extern int sched_getaffinity (__pid_t __pid, size_t __cpusetsize, 
135 cpu_set_t *__cpuset) __THROW; 
136#endif 
137 
138__END_DECLS 
139 
140#endif /* sched.h */ 
141