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 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, see 19 <http://www.gnu.org/licenses/>. */ 20 21 #ifndef __need_schedparam 22 23 #ifndef _SCHED_H 24 # error "Never include <bits/sched.h> directly; use <sched.h> instead." 25 #endif 26 27 28 /* Scheduling algorithms. */ 29 #define SCHED_OTHER 0 30 #define SCHED_FIFO 1 31 #define SCHED_RR 2 32 #ifdef __USE_GNU 33 # define SCHED_BATCH 3 34 #endif 35 36 #ifdef __USE_MISC 37 /* Cloning flags. */ 38 # define CSIGNAL 0x000000ff /* Signal mask to be sent at exit. */ 39 # define CLONE_VM 0x00000100 /* Set if VM shared between processes. */ 40 # define CLONE_FS 0x00000200 /* Set if fs info shared between processes. */ 41 # define CLONE_FILES 0x00000400 /* Set if open files shared between processes. */ 42 # define CLONE_SIGHAND 0x00000800 /* Set if signal handlers shared. */ 43 # define CLONE_PTRACE 0x00002000 /* Set if tracing continues on the child. */ 44 # define CLONE_VFORK 0x00004000 /* Set if the parent wants the child to 45 wake it up on mm_release. */ 46 # define CLONE_PARENT 0x00008000 /* Set if we want to have the same 47 parent as the cloner. */ 48 # define CLONE_THREAD 0x00010000 /* Set to add to same thread group. */ 49 # define CLONE_NEWNS 0x00020000 /* Set to create new namespace. */ 50 # define CLONE_SYSVSEM 0x00040000 /* Set to shared SVID SEM_UNDO semantics. */ 51 # define CLONE_SETTLS 0x00080000 /* Set TLS info. */ 52 # define CLONE_PARENT_SETTID 0x00100000 /* Store TID in userlevel buffer 53 before MM copy. */ 54 # define CLONE_CHILD_CLEARTID 0x00200000 /* Register exit futex and memory 55 location to clear. */ 56 # define CLONE_DETACHED 0x00400000 /* Create clone detached. */ 57 # define CLONE_UNTRACED 0x00800000 /* Set if the tracing process can't 58 force CLONE_PTRACE on this clone. */ 59 # define CLONE_CHILD_SETTID 0x01000000 /* Store TID in userlevel buffer in 60 the child. */ 61 # define CLONE_STOPPED 0x02000000 /* Start in stopped state. */ 62 # define CLONE_NEWUTS 0x04000000 /* New utsname group. */ 63 # define CLONE_NEWIPC 0x08000000 /* New ipcs. */ 64 # define CLONE_NEWUSER 0x10000000 /* New user namespace. */ 65 # define CLONE_NEWPID 0x20000000 /* New pid namespace. */ 66 # define CLONE_NEWNET 0x40000000 /* New network namespace. */ 67 # define CLONE_IO 0x80000000 /* Clone I/O context. */ 68 #endif 69 70 /* The official definition. */ 71 struct sched_param 72 { 73 int __sched_priority; 74 }; 75 76 __BEGIN_DECLS 77 78 #ifdef __USE_MISC 79 /* Clone current process. */ 80 extern int clone (int (*__fn) (void *__arg), void *__child_stack, 81 int __flags, void *__arg, ...) __THROW; 82 83 /* Unshare the specified resources. */ 84 extern int unshare (int __flags) __THROW; 85 86 /* Get index of currently used CPU. */ 87 extern int sched_getcpu (void) __THROW; 88 #endif 89 90 __END_DECLS 91 92 #endif /* need schedparam */ 93 94 #if !defined __defined_schedparam \ 95 && (defined __need_schedparam || defined _SCHED_H) 96 # define __defined_schedparam 1 97 /* Data structure to describe a process' schedulability. */ 98 struct __sched_param 99 { 100 int __sched_priority; 101 }; 102 # undef __need_schedparam 103 #endif 104 105 106 #if defined _SCHED_H && !defined __cpu_set_t_defined 107 # define __cpu_set_t_defined 108 /* Size definition for CPU sets. */ 109 # define __CPU_SETSIZE 1024 110 # define __NCPUBITS (8 * sizeof (__cpu_mask)) 111 # include <stdlib.h> 112 113 /* Type for array elements in 'cpu_set_t'. */ 114 typedef unsigned long int __cpu_mask; 115 116 /* Basic access functions. */ 117 # define __CPUELT(cpu) ((cpu) / __NCPUBITS) 118 # define __CPUMASK(cpu) ((__cpu_mask) 1 << ((cpu) % __NCPUBITS)) 119 120 /* Data structure to describe CPU mask. */ 121 typedef struct 122 { 123 __cpu_mask __bits[__CPU_SETSIZE / __NCPUBITS]; 124 } cpu_set_t; 125 126 /* Access functions for CPU masks. */ 127 # define __CPU_ZERO_S(setsize, cpusetp) \ 128 do { \ 129 size_t __i; \ 130 size_t __imax = (setsize) / sizeof (__cpu_mask); \ 131 __cpu_mask *__bits = (cpusetp)->__bits; \ 132 for (__i = 0; __i < __imax; ++__i) \ 133 __bits[__i] = 0; \ 134 } while (0) 135 # define __CPU_SET_S(cpu, setsize, cpusetp) \ 136 (__extension__ \ 137 ({ size_t __cpu = (cpu); \ 138 __cpu < 8 * (setsize) \ 139 ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \ 140 |= __CPUMASK (__cpu)) \ 141 : 0; })) 142 # define __CPU_CLR_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_ISSET_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))) != 0 \ 155 : 0; })) 156 157 # define __CPU_COUNT_S(setsize, cpusetp) \ 158 __sched_cpucount (setsize, cpusetp) 159 160 # define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \ 161 (__extension__ \ 162 ({ __cpu_mask *__arr1 = (cpusetp1)->__bits; \ 163 __cpu_mask *__arr2 = (cpusetp2)->__bits; \ 164 size_t __imax = (setsize) / sizeof (__cpu_mask); \ 165 size_t __i; \ 166 for (__i = 0; __i < __imax; ++__i) \ 167 if (__arr1[__i] != __arr2[__i]) \ 168 break; \ 169 __i == __imax; })) 170 171 # define __CPU_OP_S(setsize, destset, srcset1, srcset2, op) \ 172 (__extension__ \ 173 ({ cpu_set_t *__dest = (destset); \ 174 __cpu_mask *__arr1 = (srcset1)->__bits; \ 175 __cpu_mask *__arr2 = (srcset2)->__bits; \ 176 size_t __imax = (setsize) / sizeof (__cpu_mask); \ 177 size_t __i; \ 178 for (__i = 0; __i < __imax; ++__i) \ 179 ((__cpu_mask *) __dest->__bits)[__i] = __arr1[__i] op __arr2[__i]; \ 180 __dest; })) 181 182 # define __CPU_ALLOC_SIZE(count) \ 183 ((((count) + __NCPUBITS - 1) / __NCPUBITS) * sizeof (__cpu_mask)) 184 # define __CPU_ALLOC(count) __sched_cpualloc (count) 185 # define __CPU_FREE(cpuset) __sched_cpufree (cpuset) 186 187 __BEGIN_DECLS 188 189 extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp) 190 __THROW; 191 #if 0 /* in uClibc we use macros */ 192 extern cpu_set_t *__sched_cpualloc (size_t __count) __THROW __wur; 193 extern void __sched_cpufree (cpu_set_t *__set) __THROW; 194 #else 195 # define __sched_cpualloc(cnt) ((cpu_set_t *)malloc(__CPU_ALLOC_SIZE(cnt))) 196 # define __sched_cpufree(__set) free(__set) 197 #endif 198 __END_DECLS 199 200 #endif 201