1 /* Definitions of constants and data structure for POSIX 1003.1b-1993
2 scheduling interface.
3 Copyright (C) 1996-1999,2001-2003,2005,2006,2007,2008,2009
4 Free Software Foundation, Inc.
5 This file is part of the GNU C Library.
6
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
11
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, write to the Free
19 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 02111-1307 USA. */
21
22 #ifndef __need_schedparam
23
24 #ifndef _SCHED_H
25 # error "Never include <bits/sched.h> directly; use <sched.h> instead."
26 #endif
27
28
29 /* Scheduling algorithms. */
30 #define SCHED_OTHER 0
31 #define SCHED_FIFO 1
32 #define SCHED_RR 2
33 #ifdef __USE_GNU
34 # define SCHED_BATCH 3
35 # define SCHED_IDLE 5
36
37 # define SCHED_RESET_ON_FORK 0x40000000
38 #endif
39
40 #ifdef __USE_MISC
41 /* Cloning flags. */
42 # define CSIGNAL 0x000000ff /* Signal mask to be sent at exit. */
43 # define CLONE_VM 0x00000100 /* Set if VM shared between processes. */
44 # define CLONE_FS 0x00000200 /* Set if fs info shared between processes. */
45 # define CLONE_FILES 0x00000400 /* Set if open files shared between processes. */
46 # define CLONE_SIGHAND 0x00000800 /* Set if signal handlers shared. */
47 # define CLONE_PTRACE 0x00002000 /* Set if tracing continues on the child. */
48 # define CLONE_VFORK 0x00004000 /* Set if the parent wants the child to
49 wake it up on mm_release. */
50 # define CLONE_PARENT 0x00008000 /* Set if we want to have the same
51 parent as the cloner. */
52 # define CLONE_THREAD 0x00010000 /* Set to add to same thread group. */
53 # define CLONE_NEWNS 0x00020000 /* Set to create new namespace. */
54 # define CLONE_SYSVSEM 0x00040000 /* Set to shared SVID SEM_UNDO semantics. */
55 # define CLONE_SETTLS 0x00080000 /* Set TLS info. */
56 # define CLONE_PARENT_SETTID 0x00100000 /* Store TID in userlevel buffer
57 before MM copy. */
58 # define CLONE_CHILD_CLEARTID 0x00200000 /* Register exit futex and memory
59 location to clear. */
60 # define CLONE_DETACHED 0x00400000 /* Create clone detached. */
61 # define CLONE_UNTRACED 0x00800000 /* Set if the tracing process can't
62 force CLONE_PTRACE on this clone. */
63 # define CLONE_CHILD_SETTID 0x01000000 /* Store TID in userlevel buffer in
64 the child. */
65 # define CLONE_NEWUTS 0x04000000 /* New utsname group. */
66 # define CLONE_NEWIPC 0x08000000 /* New ipcs. */
67 # define CLONE_NEWUSER 0x10000000 /* New user namespace. */
68 # define CLONE_NEWPID 0x20000000 /* New pid namespace. */
69 # define CLONE_NEWNET 0x40000000 /* New network namespace. */
70 # define CLONE_IO 0x80000000 /* Clone I/O context. */
71 #endif
72
73 /* The official definition. */
74 struct sched_param
75 {
76 int __sched_priority;
77 };
78
79 __BEGIN_DECLS
80
81 #ifdef __USE_MISC
82 /* Clone current process. */
83 extern int clone (int (*__fn) (void *__arg), void *__child_stack,
84 int __flags, void *__arg, ...) __THROW;
85
86 /* Unshare the specified resources. */
87 extern int unshare (int __flags) __THROW;
88
89 /* Get index of currently used CPU. */
90 extern int sched_getcpu (void) __THROW;
91 #endif
92
93 __END_DECLS
94
95 #endif /* need schedparam */
96
97 #if !defined __defined_schedparam \
98 && (defined __need_schedparam || defined _SCHED_H)
99 # define __defined_schedparam 1
100 /* Data structure to describe a process' schedulability. */
101 struct __sched_param
102 {
103 int __sched_priority;
104 };
105 # undef __need_schedparam
106 #endif
107
108
109 #if defined _SCHED_H && !defined __cpu_set_t_defined
110 # define __cpu_set_t_defined
111 /* Size definition for CPU sets. */
112 # define __CPU_SETSIZE 1024
113 # define __NCPUBITS (8 * sizeof (__cpu_mask))
114
115 /* Type for array elements in 'cpu_set_t'. */
116 typedef unsigned long int __cpu_mask;
117
118 /* Basic access functions. */
119 # define __CPUELT(cpu) ((cpu) / __NCPUBITS)
120 # define __CPUMASK(cpu) ((__cpu_mask) 1 << ((cpu) % __NCPUBITS))
121
122 /* Data structure to describe CPU mask. */
123 typedef struct
124 {
125 __cpu_mask __bits[__CPU_SETSIZE / __NCPUBITS];
126 } cpu_set_t;
127
128 /* Access functions for CPU masks. */
129 # if __GNUC_PREREQ (2, 91)
130 # define __CPU_ZERO_S(setsize, cpusetp) \
131 do __builtin_memset (cpusetp, '\0', setsize); while (0)
132 # else
133 # define __CPU_ZERO_S(setsize, cpusetp) \
134 do { \
135 size_t __i; \
136 size_t __imax = (setsize) / sizeof (__cpu_mask); \
137 __cpu_mask *__bits = (cpusetp)->__bits; \
138 for (__i = 0; __i < __imax; ++__i) \
139 __bits[__i] = 0; \
140 } while (0)
141 # endif
142 # define __CPU_SET_S(cpu, setsize, cpusetp) \
143 (__extension__ \
144 ({ size_t __cpu = (cpu); \
145 __cpu < 8 * (setsize) \
146 ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \
147 |= __CPUMASK (__cpu)) \
148 : 0; }))
149 # define __CPU_CLR_S(cpu, setsize, cpusetp) \
150 (__extension__ \
151 ({ size_t __cpu = (cpu); \
152 __cpu < 8 * (setsize) \
153 ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \
154 &= ~__CPUMASK (__cpu)) \
155 : 0; }))
156 # define __CPU_ISSET_S(cpu, setsize, cpusetp) \
157 (__extension__ \
158 ({ size_t __cpu = (cpu); \
159 __cpu < 8 * (setsize) \
160 ? ((((__const __cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \
161 & __CPUMASK (__cpu))) != 0 \
162 : 0; }))
163
164 # define __CPU_COUNT_S(setsize, cpusetp) \
165 __sched_cpucount (setsize, cpusetp)
166
167 # if __GNUC_PREREQ (2, 91)
168 # define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
169 (__builtin_memcmp (cpusetp1, cpusetp2, setsize) == 0)
170 # else
171 # define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
172 (__extension__ \
173 ({ __const __cpu_mask *__arr1 = (cpusetp1)->__bits; \
174 __const __cpu_mask *__arr2 = (cpusetp2)->__bits; \
175 size_t __imax = (setsize) / sizeof (__cpu_mask); \
176 size_t __i; \
177 for (__i = 0; __i < __imax; ++__i) \
178 if (__bits[__i] != __bits[__i]) \
179 break; \
180 __i == __imax; }))
181 # endif
182
183 # define __CPU_OP_S(setsize, destset, srcset1, srcset2, op) \
184 (__extension__ \
185 ({ cpu_set_t *__dest = (destset); \
186 __const __cpu_mask *__arr1 = (srcset1)->__bits; \
187 __const __cpu_mask *__arr2 = (srcset2)->__bits; \
188 size_t __imax = (setsize) / sizeof (__cpu_mask); \
189 size_t __i; \
190 for (__i = 0; __i < __imax; ++__i) \
191 ((__cpu_mask *) __dest->__bits)[__i] = __arr1[__i] op __arr2[__i]; \
192 __dest; }))
193
194 # define __CPU_ALLOC_SIZE(count) \
195 ((((count) + __NCPUBITS - 1) / __NCPUBITS) * sizeof (__cpu_mask))
196 # define __CPU_ALLOC(count) __sched_cpualloc (count)
197 # define __CPU_FREE(cpuset) __sched_cpufree (cpuset)
198
199 __BEGIN_DECLS
200
201 extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
202 __THROW;
203 extern cpu_set_t *__sched_cpualloc (size_t __count) __THROW __wur;
204 extern void __sched_cpufree (cpu_set_t *__set) __THROW;
205
206 __END_DECLS
207
208 #endif
209