glibc (2.38)
1 /* Definitions for POSIX 1003.1b-1993 (aka POSIX.4) scheduling interface.
2 Copyright (C) 1996-2023 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
38 typedef __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. */
54 extern int sched_setparam (__pid_t __pid, const struct sched_param *__param)
55 __THROW;
56
57 /* Retrieve scheduling parameters for a particular process. */
58 extern int sched_getparam (__pid_t __pid, struct sched_param *__param) __THROW;
59
60 /* Set scheduling algorithm and/or parameters for a process. */
61 extern int sched_setscheduler (__pid_t __pid, int __policy,
62 const struct sched_param *__param) __THROW;
63
64 /* Retrieve scheduling algorithm for a particular purpose. */
65 extern int sched_getscheduler (__pid_t __pid) __THROW;
66
67 /* Yield the processor. */
68 extern int sched_yield (void) __THROW;
69
70 /* Get maximum priority value for a scheduler. */
71 extern int sched_get_priority_max (int __algorithm) __THROW;
72
73 /* Get minimum priority value for a scheduler. */
74 extern int sched_get_priority_min (int __algorithm) __THROW;
75
76 /* Get the SCHED_RR interval for the named process. */
77 #ifndef __USE_TIME_BITS64
78 extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __THROW;
79 #else
80 # ifdef __REDIRECT_NTH
81 extern 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 */
130 extern 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 */
134 extern 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 */
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