1/* Definition of the cpu_set_t structure used by the POSIX 1003.1b-1993 
2 scheduling interface. 
3 Copyright (C) 1996-2020 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'. */ 
32typedef __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. */ 
39typedef 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 
117extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp) 
118 __THROW; 
119extern cpu_set_t *__sched_cpualloc (size_t __count) __THROW __wur; 
120extern void __sched_cpufree (cpu_set_t *__set) __THROW; 
121 
122__END_DECLS 
123 
124#endif /* bits/cpu-set.h */ 
125