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[glibc/history.git] / posix / sched.h
blobe95c80f5627f72b9f1f6b7e599660336cbc77a62
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.
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.
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.
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. */
20 #ifndef _SCHED_H
21 #define _SCHED_H 1
23 #include <features.h>
25 /* Get type definitions. */
26 #include <bits/types.h>
28 #define __need_size_t
29 #include <stddef.h>
31 #define __need_timespec
32 #include <time.h>
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
40 __BEGIN_DECLS
42 /* Set scheduling parameters for a process. */
43 extern int sched_setparam (__pid_t __pid, __const struct sched_param *__param)
44 __THROW;
46 /* Retrieve scheduling parameters for a particular process. */
47 extern int sched_getparam (__pid_t __pid, struct sched_param *__param) __THROW;
49 /* Set scheduling algorithm and/or parameters for a process. */
50 extern int sched_setscheduler (__pid_t __pid, int __policy,
51 __const struct sched_param *__param) __THROW;
53 /* Retrieve scheduling algorithm for a particular purpose. */
54 extern int sched_getscheduler (__pid_t __pid) __THROW;
56 /* Yield the processor. */
57 extern int sched_yield (void) __THROW;
59 /* Get maximum priority value for a scheduler. */
60 extern int sched_get_priority_max (int __algorithm) __THROW;
62 /* Get minimum priority value for a scheduler. */
63 extern int sched_get_priority_min (int __algorithm) __THROW;
65 /* Get the SCHED_RR interval for the named process. */
66 extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __THROW;
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)
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)
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)
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, ^)
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)
109 /* Set the CPU affinity for a task */
110 extern int sched_setaffinity (__pid_t __pid, size_t __cpusetsize,
111 __const cpu_set_t *__cpuset) __THROW;
113 /* Get the CPU affinity for a task */
114 extern int sched_getaffinity (__pid_t __pid, size_t __cpusetsize,
115 cpu_set_t *__cpuset) __THROW;
116 #endif
118 __END_DECLS
120 #endif /* sched.h */