i686-linux-gnu-4.7/usr/include/x86_64-linux-gnu/bits/cpu-set.h

   1 /* Definition of the cpu_set_t structure used by the POSIX 1003.1b-1993
   2    scheduling interface.
   3    Copyright (C) 1996-2018 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 */