1 | /* Definition of the cpu_set_t structure used by the POSIX 1003.1b-1993 |
2 | scheduling interface. |
3 | Copyright (C) 1996-2019 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 | <http://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 */ |
125 | |