1/* Definitions of constants and data structure for POSIX 1003.1b-1993
2 scheduling interface.
3 Copyright (C) 1996-2016 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 __need_schedparam
21
22#ifndef _SCHED_H
23# error "Never include <bits/sched.h> directly; use <sched.h> instead."
24#endif
25
26
27/* Scheduling algorithms. */
28#define SCHED_OTHER 0
29#define SCHED_FIFO 1
30#define SCHED_RR 2
31#ifdef __USE_GNU
32# define SCHED_BATCH 3
33# define SCHED_IDLE 5
34
35# define SCHED_RESET_ON_FORK 0x40000000
36#endif
37
38#ifdef __USE_GNU
39/* Cloning flags. */
40# define CSIGNAL 0x000000ff /* Signal mask to be sent at exit. */
41# define CLONE_VM 0x00000100 /* Set if VM shared between processes. */
42# define CLONE_FS 0x00000200 /* Set if fs info shared between processes. */
43# define CLONE_FILES 0x00000400 /* Set if open files shared between processes. */
44# define CLONE_SIGHAND 0x00000800 /* Set if signal handlers shared. */
45# define CLONE_PTRACE 0x00002000 /* Set if tracing continues on the child. */
46# define CLONE_VFORK 0x00004000 /* Set if the parent wants the child to
47 wake it up on mm_release. */
48# define CLONE_PARENT 0x00008000 /* Set if we want to have the same
49 parent as the cloner. */
50# define CLONE_THREAD 0x00010000 /* Set to add to same thread group. */
51# define CLONE_NEWNS 0x00020000 /* Set to create new namespace. */
52# define CLONE_SYSVSEM 0x00040000 /* Set to shared SVID SEM_UNDO semantics. */
53# define CLONE_SETTLS 0x00080000 /* Set TLS info. */
54# define CLONE_PARENT_SETTID 0x00100000 /* Store TID in userlevel buffer
55 before MM copy. */
56# define CLONE_CHILD_CLEARTID 0x00200000 /* Register exit futex and memory
57 location to clear. */
58# define CLONE_DETACHED 0x00400000 /* Create clone detached. */
59# define CLONE_UNTRACED 0x00800000 /* Set if the tracing process can't
60 force CLONE_PTRACE on this clone. */
61# define CLONE_CHILD_SETTID 0x01000000 /* Store TID in userlevel buffer in
62 the child. */
63# define CLONE_NEWCGROUP 0x02000000 /* New cgroup namespace. */
64# define CLONE_NEWUTS 0x04000000 /* New utsname group. */
65# define CLONE_NEWIPC 0x08000000 /* New ipcs. */
66# define CLONE_NEWUSER 0x10000000 /* New user namespace. */
67# define CLONE_NEWPID 0x20000000 /* New pid namespace. */
68# define CLONE_NEWNET 0x40000000 /* New network namespace. */
69# define CLONE_IO 0x80000000 /* Clone I/O context. */
70#endif
71
72/* The official definition. */
73struct sched_param
74 {
75 int __sched_priority;
76 };
77
78__BEGIN_DECLS
79
80#ifdef __USE_GNU
81/* Clone current process. */
82extern int clone (int (*__fn) (void *__arg), void *__child_stack,
83 int __flags, void *__arg, ...) __THROW;
84
85/* Unshare the specified resources. */
86extern int unshare (int __flags) __THROW;
87
88/* Get index of currently used CPU. */
89extern int sched_getcpu (void) __THROW;
90
91/* Switch process to namespace of type NSTYPE indicated by FD. */
92extern int setns (int __fd, int __nstype) __THROW;
93#endif
94
95
96__END_DECLS
97
98#endif /* need schedparam */
99
100#if !defined __defined_schedparam \
101 && (defined __need_schedparam || defined _SCHED_H)
102# define __defined_schedparam 1
103/* Data structure to describe a process' schedulability. */
104struct __sched_param
105 {
106 int __sched_priority;
107 };
108# undef __need_schedparam
109#endif
110
111
112#if defined _SCHED_H && !defined __cpu_set_t_defined
113# define __cpu_set_t_defined
114/* Size definition for CPU sets. */
115# define __CPU_SETSIZE 1024
116# define __NCPUBITS (8 * sizeof (__cpu_mask))
117
118/* Type for array elements in 'cpu_set_t'. */
119typedef __CPU_MASK_TYPE __cpu_mask;
120
121/* Basic access functions. */
122# define __CPUELT(cpu) ((cpu) / __NCPUBITS)
123# define __CPUMASK(cpu) ((__cpu_mask) 1 << ((cpu) % __NCPUBITS))
124
125/* Data structure to describe CPU mask. */
126typedef struct
127{
128 __cpu_mask __bits[__CPU_SETSIZE / __NCPUBITS];
129} cpu_set_t;
130
131/* Access functions for CPU masks. */
132# if __GNUC_PREREQ (2, 91)
133# define __CPU_ZERO_S(setsize, cpusetp) \
134 do __builtin_memset (cpusetp, '\0', setsize); while (0)
135# else
136# define __CPU_ZERO_S(setsize, cpusetp) \
137 do { \
138 size_t __i; \
139 size_t __imax = (setsize) / sizeof (__cpu_mask); \
140 __cpu_mask *__bits = (cpusetp)->__bits; \
141 for (__i = 0; __i < __imax; ++__i) \
142 __bits[__i] = 0; \
143 } while (0)
144# endif
145# define __CPU_SET_S(cpu, setsize, cpusetp) \
146 (__extension__ \
147 ({ size_t __cpu = (cpu); \
148 __cpu / 8 < (setsize) \
149 ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \
150 |= __CPUMASK (__cpu)) \
151 : 0; }))
152# define __CPU_CLR_S(cpu, setsize, cpusetp) \
153 (__extension__ \
154 ({ size_t __cpu = (cpu); \
155 __cpu / 8 < (setsize) \
156 ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \
157 &= ~__CPUMASK (__cpu)) \
158 : 0; }))
159# define __CPU_ISSET_S(cpu, setsize, cpusetp) \
160 (__extension__ \
161 ({ size_t __cpu = (cpu); \
162 __cpu / 8 < (setsize) \
163 ? ((((const __cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \
164 & __CPUMASK (__cpu))) != 0 \
165 : 0; }))
166
167# define __CPU_COUNT_S(setsize, cpusetp) \
168 __sched_cpucount (setsize, cpusetp)
169
170# if __GNUC_PREREQ (2, 91)
171# define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
172 (__builtin_memcmp (cpusetp1, cpusetp2, setsize) == 0)
173# else
174# define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
175 (__extension__ \
176 ({ const __cpu_mask *__arr1 = (cpusetp1)->__bits; \
177 const __cpu_mask *__arr2 = (cpusetp2)->__bits; \
178 size_t __imax = (setsize) / sizeof (__cpu_mask); \
179 size_t __i; \
180 for (__i = 0; __i < __imax; ++__i) \
181 if (__arr1[__i] != __arr2[__i]) \
182 break; \
183 __i == __imax; }))
184# endif
185
186# define __CPU_OP_S(setsize, destset, srcset1, srcset2, op) \
187 (__extension__ \
188 ({ cpu_set_t *__dest = (destset); \
189 const __cpu_mask *__arr1 = (srcset1)->__bits; \
190 const __cpu_mask *__arr2 = (srcset2)->__bits; \
191 size_t __imax = (setsize) / sizeof (__cpu_mask); \
192 size_t __i; \
193 for (__i = 0; __i < __imax; ++__i) \
194 ((__cpu_mask *) __dest->__bits)[__i] = __arr1[__i] op __arr2[__i]; \
195 __dest; }))
196
197# define __CPU_ALLOC_SIZE(count) \
198 ((((count) + __NCPUBITS - 1) / __NCPUBITS) * sizeof (__cpu_mask))
199# define __CPU_ALLOC(count) __sched_cpualloc (count)
200# define __CPU_FREE(cpuset) __sched_cpufree (cpuset)
201
202__BEGIN_DECLS
203
204extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
205 __THROW;
206extern cpu_set_t *__sched_cpualloc (size_t __count) __THROW __wur;
207extern void __sched_cpufree (cpu_set_t *__set) __THROW;
208
209__END_DECLS
210
211#endif
212