1 /* Definitions of constants and data structure for POSIX 1003.1b-1993
2 scheduling interface.
3 Copyright (C) 1996-2015 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_NEWUTS 0x04000000 /* New utsname group. */
64 # define CLONE_NEWIPC 0x08000000 /* New ipcs. */
65 # define CLONE_NEWUSER 0x10000000 /* New user namespace. */
66 # define CLONE_NEWPID 0x20000000 /* New pid namespace. */
67 # define CLONE_NEWNET 0x40000000 /* New network namespace. */
68 # define CLONE_IO 0x80000000 /* Clone I/O context. */
69 #endif
70
71 /* The official definition. */
72 struct sched_param
73 {
74 int __sched_priority;
75 };
76
77 __BEGIN_DECLS
78
79 #ifdef __USE_GNU
80 /* Clone current process. */
81 extern int clone (int (*__fn) (void *__arg), void *__child_stack,
82 int __flags, void *__arg, ...) __THROW;
83
84 /* Unshare the specified resources. */
85 extern int unshare (int __flags) __THROW;
86
87 /* Get index of currently used CPU. */
88 extern int sched_getcpu (void) __THROW;
89
90 /* Switch process to namespace of type NSTYPE indicated by FD. */
91 extern int setns (int __fd, int __nstype) __THROW;
92 #endif
93
94
95 __END_DECLS
96
97 #endif /* need schedparam */
98
99 #if !defined __defined_schedparam \
100 && (defined __need_schedparam || defined _SCHED_H)
101 # define __defined_schedparam 1
102 /* Data structure to describe a process' schedulability. */
103 struct __sched_param
104 {
105 int __sched_priority;
106 };
107 # undef __need_schedparam
108 #endif
109
110
111 #if defined _SCHED_H && !defined __cpu_set_t_defined
112 # define __cpu_set_t_defined
113 /* Size definition for CPU sets. */
114 # define __CPU_SETSIZE 4096
115 # define __NCPUBITS (8 * sizeof (__cpu_mask))
116
117 /* Type for array elements in 'cpu_set_t'. */
118 typedef unsigned long int __cpu_mask;
119
120 /* Basic access functions. */
121 # define __CPUELT(cpu) ((cpu) / __NCPUBITS)
122 # define __CPUMASK(cpu) ((__cpu_mask) 1 << ((cpu) % __NCPUBITS))
123
124 /* Data structure to describe CPU mask. */
125 typedef struct
126 {
127 __cpu_mask __bits[__CPU_SETSIZE / __NCPUBITS];
128 } cpu_set_t;
129
130 /* Access functions for CPU masks. */
131 # if __GNUC_PREREQ (2, 91)
132 # define __CPU_ZERO_S(setsize, cpusetp) \
133 do __builtin_memset (cpusetp, '\0', setsize); while (0)
134 # else
135 # define __CPU_ZERO_S(setsize, cpusetp) \
136 do { \
137 size_t __i; \
138 size_t __imax = (setsize) / sizeof (__cpu_mask); \
139 __cpu_mask *__bits = (cpusetp)->__bits; \
140 for (__i = 0; __i < __imax; ++__i) \
141 __bits[__i] = 0; \
142 } while (0)
143 # endif
144 # define __CPU_SET_S(cpu, setsize, cpusetp) \
145 (__extension__ \
146 ({ size_t __cpu = (cpu); \
147 __cpu / 8 < (setsize) \
148 ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \
149 |= __CPUMASK (__cpu)) \
150 : 0; }))
151 # define __CPU_CLR_S(cpu, setsize, cpusetp) \
152 (__extension__ \
153 ({ size_t __cpu = (cpu); \
154 __cpu / 8 < (setsize) \
155 ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \
156 &= ~__CPUMASK (__cpu)) \
157 : 0; }))
158 # define __CPU_ISSET_S(cpu, setsize, cpusetp) \
159 (__extension__ \
160 ({ size_t __cpu = (cpu); \
161 __cpu / 8 < (setsize) \
162 ? ((((const __cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \
163 & __CPUMASK (__cpu))) != 0 \
164 : 0; }))
165
166 # define __CPU_COUNT_S(setsize, cpusetp) \
167 __sched_cpucount (setsize, cpusetp)
168
169 # if __GNUC_PREREQ (2, 91)
170 # define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
171 (__builtin_memcmp (cpusetp1, cpusetp2, setsize) == 0)
172 # else
173 # define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
174 (__extension__ \
175 ({ const __cpu_mask *__arr1 = (cpusetp1)->__bits; \
176 const __cpu_mask *__arr2 = (cpusetp2)->__bits; \
177 size_t __imax = (setsize) / sizeof (__cpu_mask); \
178 size_t __i; \
179 for (__i = 0; __i < __imax; ++__i) \
180 if (__arr1[__i] != __arr2[__i]) \
181 break; \
182 __i == __imax; }))
183 # endif
184
185 # define __CPU_OP_S(setsize, destset, srcset1, srcset2, op) \
186 (__extension__ \
187 ({ cpu_set_t *__dest = (destset); \
188 const __cpu_mask *__arr1 = (srcset1)->__bits; \
189 const __cpu_mask *__arr2 = (srcset2)->__bits; \
190 size_t __imax = (setsize) / sizeof (__cpu_mask); \
191 size_t __i; \
192 for (__i = 0; __i < __imax; ++__i) \
193 ((__cpu_mask *) __dest->__bits)[__i] = __arr1[__i] op __arr2[__i]; \
194 __dest; }))
195
196 # define __CPU_ALLOC_SIZE(count) \
197 ((((count) + __NCPUBITS - 1) / __NCPUBITS) * sizeof (__cpu_mask))
198 # define __CPU_ALLOC(count) __sched_cpualloc (count)
199 # define __CPU_FREE(cpuset) __sched_cpufree (cpuset)
200
201 __BEGIN_DECLS
202
203 extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
204 __THROW;
205 extern cpu_set_t *__sched_cpualloc (size_t __count) __THROW __wur;
206 extern void __sched_cpufree (cpu_set_t *__set) __THROW;
207
208 __END_DECLS
209
210 #endif
211