bits/sched.h

   1 /* Definitions of constants and data structure for POSIX 1003.1b-1993
   2    scheduling interface.
   3    Copyright (C) 1996-1999,2001-2003,2005,2006,2007,2008,2009,2011,2012
   4    Free Software Foundation, Inc.
   5    This file is part of the GNU C Library.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef __need_schedparam
  22
  23 #ifndef _SCHED_H
  24 # error "Never include <bits/sched.h> directly; use <sched.h> instead."
  25 #endif
  26
  27
  28 /* Scheduling algorithms.  */
  29 #define SCHED_OTHER     0
  30 #define SCHED_FIFO      1
  31 #define SCHED_RR        2
  32
  33 /* Data structure to describe a process' schedulability.  */
  34 struct sched_param
  35 {
  36   int __sched_priority;
  37 };
  38
  39 #endif  /* need schedparam */
  40
  41 #if !defined __defined_schedparam \
  42     && (defined __need_schedparam || defined _SCHED_H)
  43 # define __defined_schedparam   1
  44 /* Data structure to describe a process' schedulability.  */
  45 struct __sched_param
  46   {
  47     int __sched_priority;
  48   };
  49 # undef __need_schedparam
  50 #endif
  51
  52
  53 #if defined _SCHED_H && !defined __cpu_set_t_defined
  54 # define __cpu_set_t_defined
  55 /* Size definition for CPU sets.  */
  56 # define __CPU_SETSIZE  1024
  57 # define __NCPUBITS     (8 * sizeof (__cpu_mask))
  58
  59 /* Type for array elements in 'cpu_set_t'.  */
  60 typedef unsigned long int __cpu_mask;
  61
  62 /* Basic access functions.  */
  63 # define __CPUELT(cpu)  ((cpu) / __NCPUBITS)
  64 # define __CPUMASK(cpu) ((__cpu_mask) 1 << ((cpu) % __NCPUBITS))
  65
  66 /* Data structure to describe CPU mask.  */
  67 typedef struct
  68 {
  69   __cpu_mask __bits[__CPU_SETSIZE / __NCPUBITS];
  70 } cpu_set_t;
  71
  72 /* Access functions for CPU masks.  */
  73 # if __GNUC_PREREQ (2, 91)
  74 #  define __CPU_ZERO_S(setsize, cpusetp) \
  75   do __builtin_memset (cpusetp, '\0', setsize); while (0)
  76 # else
  77 #  define __CPU_ZERO_S(setsize, cpusetp) \
  78   do {                                                                        \
  79     size_t __i;                                                               \
  80     size_t __imax = (setsize) / sizeof (__cpu_mask);                          \
  81     __cpu_mask *__bits = (cpusetp)->__bits;                                   \
  82     for (__i = 0; __i < __imax; ++__i)                                        \
  83       __bits[__i] = 0;                                                        \
  84   } while (0)
  85 # endif
  86 # define __CPU_SET_S(cpu, setsize, cpusetp) \
  87   (__extension__                                                              \
  88    ({ size_t __cpu = (cpu);                                                   \
  89       __cpu < 8 * (setsize)                                                   \
  90       ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]               \
  91          |= __CPUMASK (__cpu))                                                \
  92       : 0; }))
  93 # define __CPU_CLR_S(cpu, setsize, cpusetp) \
  94   (__extension__                                                              \
  95    ({ size_t __cpu = (cpu);                                                   \
  96       __cpu < 8 * (setsize)                                                   \
  97       ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]               \
  98          &= ~__CPUMASK (__cpu))                                               \
  99       : 0; }))
 100 # define __CPU_ISSET_S(cpu, setsize, cpusetp) \
 101   (__extension__                                                              \
 102    ({ size_t __cpu = (cpu);                                                   \
 103       __cpu < 8 * (setsize)                                                   \
 104       ? ((((const __cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]      \
 105           & __CPUMASK (__cpu))) != 0                                          \
 106       : 0; }))
 107
 108 # define __CPU_COUNT_S(setsize, cpusetp) \
 109   __sched_cpucount (setsize, cpusetp)
 110
 111 # if __GNUC_PREREQ (2, 91)
 112 #  define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
 113   (__builtin_memcmp (cpusetp1, cpusetp2, setsize) == 0)
 114 # else
 115 #  define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
 116   (__extension__                                                              \
 117    ({ const __cpu_mask *__arr1 = (cpusetp1)->__bits;                          \
 118       const __cpu_mask *__arr2 = (cpusetp2)->__bits;                          \
 119       size_t __imax = (setsize) / sizeof (__cpu_mask);                        \
 120       size_t __i;                                                             \
 121       for (__i = 0; __i < __imax; ++__i)                                      \
 122         if (__arr1[__i] != __arr2[__i])                                       \
 123           break;                                                              \
 124       __i == __imax; }))
 125 # endif
 126
 127 # define __CPU_OP_S(setsize, destset, srcset1, srcset2, op) \
 128   (__extension__                                                              \
 129    ({ cpu_set_t *__dest = (destset);                                          \
 130       const __cpu_mask *__arr1 = (srcset1)->__bits;                           \
 131       const __cpu_mask *__arr2 = (srcset2)->__bits;                           \
 132       size_t __imax = (setsize) / sizeof (__cpu_mask);                        \
 133       size_t __i;                                                             \
 134       for (__i = 0; __i < __imax; ++__i)                                      \
 135         ((__cpu_mask *) __dest->__bits)[__i] = __arr1[__i] op __arr2[__i];    \
 136       __dest; }))
 137
 138 # define __CPU_ALLOC_SIZE(count) \
 139   ((((count) + __NCPUBITS - 1) / __NCPUBITS) * sizeof (__cpu_mask))
 140 # define __CPU_ALLOC(count) __sched_cpualloc (count)
 141 # define __CPU_FREE(cpuset) __sched_cpufree (cpuset)
 142
 143 __BEGIN_DECLS
 144
 145 extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
 146      __THROW;
 147 extern cpu_set_t *__sched_cpualloc (size_t __count) __THROW __wur;
 148 extern void __sched_cpufree (cpu_set_t *__set) __THROW;
 149
 150 __END_DECLS
 151
 152 #endif