/* Definition of the cpu_set_t structure used by the POSIX 1003.1b-1993 scheduling interface. Copyright (C) 1996-2021 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ #ifndef _BITS_CPU_SET_H #define _BITS_CPU_SET_H 1 #ifndef _SCHED_H # error "Never include <bits/cpu-set.h> directly; use <sched.h> instead." #endif /* Size definition for CPU sets. */ #define __CPU_SETSIZE 1024 #define __NCPUBITS (8 * sizeof (__cpu_mask)) /* Type for array elements in 'cpu_set_t'. */ typedef __CPU_MASK_TYPE __cpu_mask; /* Basic access functions. */ #define __CPUELT(cpu) ((cpu) / __NCPUBITS) #define __CPUMASK(cpu) ((__cpu_mask) 1 << ((cpu) % __NCPUBITS)) /* Data structure to describe CPU mask. */ typedef struct { __cpu_mask __bits[__CPU_SETSIZE / __NCPUBITS]; } cpu_set_t; /* Access functions for CPU masks. */ #if __GNUC_PREREQ (2, 91) # define __CPU_ZERO_S(setsize, cpusetp) \ do __builtin_memset (cpusetp, '\0', setsize); while (0) #else # define __CPU_ZERO_S(setsize, cpusetp) \ do { \ size_t __i; \ size_t __imax = (setsize) / sizeof (__cpu_mask); \ __cpu_mask *__bits = (cpusetp)->__bits; \ for (__i = 0; __i < __imax; ++__i) \ __bits[__i] = 0; \ } while (0) #endif #define __CPU_SET_S(cpu, setsize, cpusetp) \ (__extension__ \ ({ size_t __cpu = (cpu); \ __cpu / 8 < (setsize) \ ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \ |= __CPUMASK (__cpu)) \ : 0; })) #define __CPU_CLR_S(cpu, setsize, cpusetp) \ (__extension__ \ ({ size_t __cpu = (cpu); \ __cpu / 8 < (setsize) \ ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \ &= ~__CPUMASK (__cpu)) \ : 0; })) #define __CPU_ISSET_S(cpu, setsize, cpusetp) \ (__extension__ \ ({ size_t __cpu = (cpu); \ __cpu / 8 < (setsize) \ ? ((((const __cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \ & __CPUMASK (__cpu))) != 0 \ : 0; })) #define __CPU_COUNT_S(setsize, cpusetp) \ __sched_cpucount (setsize, cpusetp) #if __GNUC_PREREQ (2, 91) # define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \ (__builtin_memcmp (cpusetp1, cpusetp2, setsize) == 0) #else # define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \ (__extension__ \ ({ const __cpu_mask *__arr1 = (cpusetp1)->__bits; \ const __cpu_mask *__arr2 = (cpusetp2)->__bits; \ size_t __imax = (setsize) / sizeof (__cpu_mask); \ size_t __i; \ for (__i = 0; __i < __imax; ++__i) \ if (__arr1[__i] != __arr2[__i]) \ break; \ __i == __imax; })) #endif #define __CPU_OP_S(setsize, destset, srcset1, srcset2, op) \ (__extension__ \ ({ cpu_set_t *__dest = (destset); \ const __cpu_mask *__arr1 = (srcset1)->__bits; \ const __cpu_mask *__arr2 = (srcset2)->__bits; \ size_t __imax = (setsize) / sizeof (__cpu_mask); \ size_t __i; \ for (__i = 0; __i < __imax; ++__i) \ ((__cpu_mask *) __dest->__bits)[__i] = __arr1[__i] op __arr2[__i]; \ __dest; })) #define __CPU_ALLOC_SIZE(count) \ ((((count) + __NCPUBITS - 1) / __NCPUBITS) * sizeof (__cpu_mask)) #define __CPU_ALLOC(count) __sched_cpualloc (count) #define __CPU_FREE(cpuset) __sched_cpufree (cpuset) __BEGIN_DECLS extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp) __THROW; extern cpu_set_t *__sched_cpualloc (size_t __count) __THROW __wur; extern void __sched_cpufree (cpu_set_t *__set) __THROW; __END_DECLS #endif /* bits/cpu-set.h */