bits/sched.h

   1 /* Definitions of constants and data structure for POSIX 1003.1b-1993
   2    scheduling interface.
   3    Copyright (C) 1996-2015 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 __need_schedparam
  21
  22 #ifndef _SCHED_H
  23 # error "Never include <bits/sched.h> directly; use <sched.h> instead."
  24 #endif
  25
  26
  27 /* Scheduling algorithms.  */
  28 #define SCHED_OTHER     0
  29 #define SCHED_FIFO      1
  30 #define SCHED_RR        2
  31
  32 /* Data structure to describe a process' schedulability.  */
  33 struct sched_param
  34 {
  35   int __sched_priority;
  36 };
  37
  38 #endif  /* need schedparam */
  39
  40 #if !defined __defined_schedparam \
  41     && (defined __need_schedparam || defined _SCHED_H)
  42 # define __defined_schedparam   1
  43 /* Data structure to describe a process' schedulability.  */
  44 struct __sched_param
  45   {
  46     int __sched_priority;
  47   };
  48 # undef __need_schedparam
  49 #endif
  50
  51
  52 #if defined _SCHED_H && !defined __cpu_set_t_defined
  53 # define __cpu_set_t_defined
  54 /* Size definition for CPU sets.  */
  55 # define __CPU_SETSIZE  1024
  56 # define __NCPUBITS     (8 * sizeof (__cpu_mask))
  57
  58 /* Type for array elements in 'cpu_set_t'.  */
  59 typedef unsigned long int __cpu_mask;
  60
  61 /* Basic access functions.  */
  62 # define __CPUELT(cpu)  ((cpu) / __NCPUBITS)
  63 # define __CPUMASK(cpu) ((__cpu_mask) 1 << ((cpu) % __NCPUBITS))
  64
  65 /* Data structure to describe CPU mask.  */
  66 typedef struct
  67 {
  68   __cpu_mask __bits[__CPU_SETSIZE / __NCPUBITS];
  69 } cpu_set_t;
  70
  71 /* Access functions for CPU masks.  */
  72 # if __GNUC_PREREQ (2, 91)
  73 #  define __CPU_ZERO_S(setsize, cpusetp) \
  74   do __builtin_memset (cpusetp, '\0', setsize); while (0)
  75 # else
  76 #  define __CPU_ZERO_S(setsize, cpusetp) \
  77   do {                                                                        \
  78     size_t __i;                                                               \
  79     size_t __imax = (setsize) / sizeof (__cpu_mask);                          \
  80     __cpu_mask *__bits = (cpusetp)->__bits;                                   \
  81     for (__i = 0; __i < __imax; ++__i)                                        \
  82       __bits[__i] = 0;                                                        \
  83   } while (0)
  84 # endif
  85 # define __CPU_SET_S(cpu, setsize, cpusetp) \
  86   (__extension__                                                              \
  87    ({ size_t __cpu = (cpu);                                                   \
  88       __cpu < 8 * (setsize)                                                   \
  89       ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]               \
  90          |= __CPUMASK (__cpu))                                                \
  91       : 0; }))
  92 # define __CPU_CLR_S(cpu, setsize, cpusetp) \
  93   (__extension__                                                              \
  94    ({ size_t __cpu = (cpu);                                                   \
  95       __cpu < 8 * (setsize)                                                   \
  96       ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]               \
  97          &= ~__CPUMASK (__cpu))                                               \
  98       : 0; }))
  99 # define __CPU_ISSET_S(cpu, setsize, cpusetp) \
 100   (__extension__                                                              \
 101    ({ size_t __cpu = (cpu);                                                   \
 102       __cpu < 8 * (setsize)                                                   \
 103       ? ((((const __cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]      \
 104           & __CPUMASK (__cpu))) != 0                                          \
 105       : 0; }))
 106
 107 # define __CPU_COUNT_S(setsize, cpusetp) \
 108   __sched_cpucount (setsize, cpusetp)
 109
 110 # if __GNUC_PREREQ (2, 91)
 111 #  define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
 112   (__builtin_memcmp (cpusetp1, cpusetp2, setsize) == 0)
 113 # else
 114 #  define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
 115   (__extension__                                                              \
 116    ({ const __cpu_mask *__arr1 = (cpusetp1)->__bits;                          \
 117       const __cpu_mask *__arr2 = (cpusetp2)->__bits;                          \
 118       size_t __imax = (setsize) / sizeof (__cpu_mask);                        \
 119       size_t __i;                                                             \
 120       for (__i = 0; __i < __imax; ++__i)                                      \
 121         if (__arr1[__i] != __arr2[__i])                                       \
 122           break;                                                              \
 123       __i == __imax; }))
 124 # endif
 125
 126 # define __CPU_OP_S(setsize, destset, srcset1, srcset2, op) \
 127   (__extension__                                                              \
 128    ({ cpu_set_t *__dest = (destset);                                          \
 129       const __cpu_mask *__arr1 = (srcset1)->__bits;                           \
 130       const __cpu_mask *__arr2 = (srcset2)->__bits;                           \
 131       size_t __imax = (setsize) / sizeof (__cpu_mask);                        \
 132       size_t __i;                                                             \
 133       for (__i = 0; __i < __imax; ++__i)                                      \
 134         ((__cpu_mask *) __dest->__bits)[__i] = __arr1[__i] op __arr2[__i];    \
 135       __dest; }))
 136
 137 # define __CPU_ALLOC_SIZE(count) \
 138   ((((count) + __NCPUBITS - 1) / __NCPUBITS) * sizeof (__cpu_mask))
 139 # define __CPU_ALLOC(count) __sched_cpualloc (count)
 140 # define __CPU_FREE(cpuset) __sched_cpufree (cpuset)
 141
 142 __BEGIN_DECLS
 143
 144 extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
 145      __THROW;
 146 extern cpu_set_t *__sched_cpualloc (size_t __count) __THROW __wur;
 147 extern void __sched_cpufree (cpu_set_t *__set) __THROW;
 148
 149 __END_DECLS
 150
 151 #endif