cpu-set.h (4516B) - Raw
1 /* Definition of the cpu_set_t structure used by the POSIX 1003.1b-1993 2 scheduling interface. 3 Copyright (C) 1996-2025 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 <https://www.gnu.org/licenses/>. */ 19 20 #ifndef _BITS_CPU_SET_H 21 #define _BITS_CPU_SET_H 1 22 23 #ifndef _SCHED_H 24 # error "Never include <bits/cpu-set.h> directly; use <sched.h> instead." 25 #endif 26 27 /* Size definition for CPU sets. */ 28 #define __CPU_SETSIZE 1024 29 #define __NCPUBITS (8 * sizeof (__cpu_mask)) 30 31 /* Type for array elements in 'cpu_set_t'. */ 32 typedef __CPU_MASK_TYPE __cpu_mask; 33 34 /* Basic access functions. */ 35 #define __CPUELT(cpu) ((cpu) / __NCPUBITS) 36 #define __CPUMASK(cpu) ((__cpu_mask) 1 << ((cpu) % __NCPUBITS)) 37 38 /* Data structure to describe CPU mask. */ 39 typedef struct 40 { 41 __cpu_mask __bits[__CPU_SETSIZE / __NCPUBITS]; 42 } cpu_set_t; 43 44 /* Access functions for CPU masks. */ 45 #if __GNUC_PREREQ (2, 91) 46 # define __CPU_ZERO_S(setsize, cpusetp) \ 47 do __builtin_memset (cpusetp, '\0', setsize); while (0) 48 #else 49 # define __CPU_ZERO_S(setsize, cpusetp) \ 50 do { \ 51 size_t __i; \ 52 size_t __imax = (setsize) / sizeof (__cpu_mask); \ 53 __cpu_mask *__bits = (cpusetp)->__bits; \ 54 for (__i = 0; __i < __imax; ++__i) \ 55 __bits[__i] = 0; \ 56 } while (0) 57 #endif 58 #define __CPU_SET_S(cpu, setsize, cpusetp) \ 59 (__extension__ \ 60 ({ size_t __cpu = (cpu); \ 61 __cpu / 8 < (setsize) \ 62 ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \ 63 |= __CPUMASK (__cpu)) \ 64 : 0; })) 65 #define __CPU_CLR_S(cpu, setsize, cpusetp) \ 66 (__extension__ \ 67 ({ size_t __cpu = (cpu); \ 68 __cpu / 8 < (setsize) \ 69 ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \ 70 &= ~__CPUMASK (__cpu)) \ 71 : 0; })) 72 #define __CPU_ISSET_S(cpu, setsize, cpusetp) \ 73 (__extension__ \ 74 ({ size_t __cpu = (cpu); \ 75 __cpu / 8 < (setsize) \ 76 ? ((((const __cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \ 77 & __CPUMASK (__cpu))) != 0 \ 78 : 0; })) 79 80 #define __CPU_COUNT_S(setsize, cpusetp) \ 81 __sched_cpucount (setsize, cpusetp) 82 83 #if __GNUC_PREREQ (2, 91) 84 # define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \ 85 (__builtin_memcmp (cpusetp1, cpusetp2, setsize) == 0) 86 #else 87 # define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \ 88 (__extension__ \ 89 ({ const __cpu_mask *__arr1 = (cpusetp1)->__bits; \ 90 const __cpu_mask *__arr2 = (cpusetp2)->__bits; \ 91 size_t __imax = (setsize) / sizeof (__cpu_mask); \ 92 size_t __i; \ 93 for (__i = 0; __i < __imax; ++__i) \ 94 if (__arr1[__i] != __arr2[__i]) \ 95 break; \ 96 __i == __imax; })) 97 #endif 98 99 #define __CPU_OP_S(setsize, destset, srcset1, srcset2, op) \ 100 (__extension__ \ 101 ({ cpu_set_t *__dest = (destset); \ 102 const __cpu_mask *__arr1 = (srcset1)->__bits; \ 103 const __cpu_mask *__arr2 = (srcset2)->__bits; \ 104 size_t __imax = (setsize) / sizeof (__cpu_mask); \ 105 size_t __i; \ 106 for (__i = 0; __i < __imax; ++__i) \ 107 ((__cpu_mask *) __dest->__bits)[__i] = __arr1[__i] op __arr2[__i]; \ 108 __dest; })) 109 110 #define __CPU_ALLOC_SIZE(count) \ 111 ((((count) + __NCPUBITS - 1) / __NCPUBITS) * sizeof (__cpu_mask)) 112 #define __CPU_ALLOC(count) __sched_cpualloc (count) 113 #define __CPU_FREE(cpuset) __sched_cpufree (cpuset) 114 115 __BEGIN_DECLS 116 117 extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp) 118 __THROW; 119 extern cpu_set_t *__sched_cpualloc (size_t __count) __THROW __wur; 120 extern void __sched_cpufree (cpu_set_t *__set) __THROW; 121 122 __END_DECLS 123 124 #endif /* bits/cpu-set.h */