1/* Definitions for POSIX 1003.1b-1993 (aka POSIX.4) scheduling interface.
2   Copyright (C) 1996,1997,1999,2001-2004,2007 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, write to the Free
17   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18   02111-1307 USA.  */
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_timespec
32#include <time.h>
33
34/* Get system specific constant and data structure definitions.  */
35#include <bits/sched.h>
36/* Define the real names for the elements of `struct sched_param'.  */
37#define sched_priority	__sched_priority
38
39
40__BEGIN_DECLS
41
42/* Set scheduling parameters for a process.  */
43extern int sched_setparam (__pid_t __pid, __const struct sched_param *__param)
44     __THROW;
45
46/* Retrieve scheduling parameters for a particular process.  */
47extern int sched_getparam (__pid_t __pid, struct sched_param *__param) __THROW;
48
49/* Set scheduling algorithm and/or parameters for a process.  */
50extern int sched_setscheduler (__pid_t __pid, int __policy,
51			       __const struct sched_param *__param) __THROW;
52
53/* Retrieve scheduling algorithm for a particular purpose.  */
54extern int sched_getscheduler (__pid_t __pid) __THROW;
55
56/* Yield the processor.  */
57extern int sched_yield (void) __THROW;
58
59/* Get maximum priority value for a scheduler.  */
60extern int sched_get_priority_max (int __algorithm) __THROW;
61
62/* Get minimum priority value for a scheduler.  */
63extern int sched_get_priority_min (int __algorithm) __THROW;
64
65/* Get the SCHED_RR interval for the named process.  */
66extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __THROW;
67
68
69#ifdef __USE_GNU
70/* Access macros for `cpu_set'.  */
71# define CPU_SETSIZE __CPU_SETSIZE
72# define CPU_SET(cpu, cpusetp)	 __CPU_SET_S (cpu, sizeof (cpu_set_t), cpusetp)
73# define CPU_CLR(cpu, cpusetp)	 __CPU_CLR_S (cpu, sizeof (cpu_set_t), cpusetp)
74# define CPU_ISSET(cpu, cpusetp) __CPU_ISSET_S (cpu, sizeof (cpu_set_t), \
75						cpusetp)
76# define CPU_ZERO(cpusetp)	 __CPU_ZERO_S (sizeof (cpu_set_t), cpusetp)
77# define CPU_COUNT(cpusetp)	 __CPU_COUNT_S (sizeof (cpu_set_t), cpusetp)
78
79# define CPU_SET_S(cpu, setsize, cpusetp)   __CPU_SET_S (cpu, setsize, cpusetp)
80# define CPU_CLR_S(cpu, setsize, cpusetp)   __CPU_CLR_S (cpu, setsize, cpusetp)
81# define CPU_ISSET_S(cpu, setsize, cpusetp) __CPU_ISSET_S (cpu, setsize, \
82							   cpusetp)
83# define CPU_ZERO_S(setsize, cpusetp)	    __CPU_ZERO_S (setsize, cpusetp)
84# define CPU_COUNT_S(setsize, cpusetp)	    __CPU_COUNT_S (setsize, cpusetp)
85
86# define CPU_EQUAL(cpusetp1, cpusetp2) \
87  __CPU_EQUAL_S (sizeof (cpu_set_t), cpusetp1, cpusetp2)
88# define CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
89  __CPU_EQUAL_S (setsize, cpusetp1, cpusetp2)
90
91# define CPU_AND(destset, srcset1, srcset2) \
92  __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, &)
93# define CPU_OR(destset, srcset1, srcset2) \
94  __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, |)
95# define CPU_XOR(destset, srcset1, srcset2) \
96  __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, ^)
97# define CPU_AND_S(setsize, destset, srcset1, srcset2) \
98  __CPU_OP_S (setsize, destset, srcset1, srcset2, &)
99# define CPU_OR_S(setsize, destset, srcset1, srcset2) \
100  __CPU_OP_S (setsize, destset, srcset1, srcset2, |)
101# define CPU_XOR_S(setsize, destset, srcset1, srcset2) \
102  __CPU_OP_S (setsize, destset, srcset1, srcset2, ^)
103
104# define CPU_ALLOC_SIZE(count) __CPU_ALLOC_SIZE (count)
105# define CPU_ALLOC(count) __CPU_ALLOC (count)
106# define CPU_FREE(cpuset) __CPU_FREE (cpuset)
107
108
109/* Set the CPU affinity for a task */
110extern int sched_setaffinity (__pid_t __pid, size_t __cpusetsize,
111			      __const cpu_set_t *__cpuset) __THROW;
112
113/* Get the CPU affinity for a task */
114extern int sched_getaffinity (__pid_t __pid, size_t __cpusetsize,
115			      cpu_set_t *__cpuset) __THROW;
116#endif
117
118__END_DECLS
119
120#endif /* sched.h */
121