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
   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, write to the Free
  19    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  20    02111-1307 USA.  */
  21
  22 #ifndef __need_schedparam
  23
  24 #ifndef _SCHED_H
  25 # error "Never include <bits/sched.h> directly; use <sched.h> instead."
  26 #endif
  27
  28
  29 /* Scheduling algorithms.  */
  30 #define SCHED_OTHER     0
  31 #define SCHED_FIFO      1
  32 #define SCHED_RR        2
  33
  34 /* Data structure to describe a process' schedulability.  */
  35 struct sched_param
  36 {
  37   int __sched_priority;
  38 };
  39
  40 #endif  /* need schedparam */
  41
  42 #if !defined __defined_schedparam \
  43     && (defined __need_schedparam || defined _SCHED_H)
  44 # define __defined_schedparam   1
  45 /* Data structure to describe a process' schedulability.  */
  46 struct __sched_param
  47   {
  48     int __sched_priority;
  49   };
  50 # undef __need_schedparam
  51 #endif
  52
  53
  54 #if defined _SCHED_H && !defined __cpu_set_t_defined
  55 # define __cpu_set_t_defined
  56 /* Size definition for CPU sets.  */
  57 # define __CPU_SETSIZE  1024
  58 # define __NCPUBITS     (8 * sizeof (__cpu_mask))
  59
  60 /* Type for array elements in 'cpu_set_t'.  */
  61 typedef unsigned long int __cpu_mask;
  62
  63 /* Basic access functions.  */
  64 # define __CPUELT(cpu)  ((cpu) / __NCPUBITS)
  65 # define __CPUMASK(cpu) ((__cpu_mask) 1 << ((cpu) % __NCPUBITS))
  66
  67 /* Data structure to describe CPU mask.  */
  68 typedef struct
  69 {
  70   __cpu_mask __bits[__CPU_SETSIZE / __NCPUBITS];
  71 } cpu_set_t;
  72
  73 /* Access functions for CPU masks.  */
  74 # if __GNUC_PREREQ (2, 91)
  75 #  define __CPU_ZERO_S(setsize, cpusetp) \
  76   do __builtin_memset (cpusetp, '\0', setsize); while (0)
  77 # else
  78 #  define __CPU_ZERO_S(setsize, cpusetp) \
  79   do {                                                                        \
  80     size_t __i;                                                               \
  81     size_t __imax = (setsize) / sizeof (__cpu_mask);                          \
  82     __cpu_mask *__bits = (cpusetp)->__bits;                                   \
  83     for (__i = 0; __i < __imax; ++__i)                                        \
  84       __bits[__i] = 0;                                                        \
  85   } while (0)
  86 # endif
  87 # define __CPU_SET_S(cpu, setsize, cpusetp) \
  88   (__extension__                                                              \
  89    ({ size_t __cpu = (cpu);                                                   \
  90       __cpu < 8 * (setsize)                                                   \
  91       ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]               \
  92          |= __CPUMASK (__cpu))                                                \
  93       : 0; }))
  94 # define __CPU_CLR_S(cpu, setsize, cpusetp) \
  95   (__extension__                                                              \
  96    ({ size_t __cpu = (cpu);                                                   \
  97       __cpu < 8 * (setsize)                                                   \
  98       ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]               \
  99          &= ~__CPUMASK (__cpu))                                               \
 100       : 0; }))
 101 # define __CPU_ISSET_S(cpu, setsize, cpusetp) \
 102   (__extension__                                                              \
 103    ({ size_t __cpu = (cpu);                                                   \
 104       __cpu < 8 * (setsize)                                                   \
 105       ? ((((__const __cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)]      \
 106           & __CPUMASK (__cpu))) != 0                                          \
 107       : 0; }))
 108
 109 # define __CPU_COUNT_S(setsize, cpusetp) \
 110   __sched_cpucount (setsize, cpusetp)
 111
 112 # if __GNUC_PREREQ (2, 91)
 113 #  define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
 114   (__builtin_memcmp (cpusetp1, cpusetp2, setsize) == 0)
 115 # else
 116 #  define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
 117   (__extension__                                                              \
 118    ({ __const __cpu_mask *__arr1 = (cpusetp1)->__bits;                        \
 119       __const __cpu_mask *__arr2 = (cpusetp2)->__bits;                        \
 120       size_t __imax = (setsize) / sizeof (__cpu_mask);                        \
 121       size_t __i;                                                             \
 122       for (__i = 0; __i < __imax; ++__i)                                      \
 123         if (__bits[__i] != __bits[__i])                                       \
 124           break;                                                              \
 125       __i == __imax; }))
 126 # endif
 127
 128 # define __CPU_OP_S(setsize, destset, srcset1, srcset2, op) \
 129   (__extension__                                                              \
 130    ({ cpu_set_t *__dest = (destset);                                          \
 131       __const __cpu_mask *__arr1 = (srcset1)->__bits;                         \
 132       __const __cpu_mask *__arr2 = (srcset2)->__bits;                         \
 133       size_t __imax = (setsize) / sizeof (__cpu_mask);                        \
 134       size_t __i;                                                             \
 135       for (__i = 0; __i < __imax; ++__i)                                      \
 136         ((__cpu_mask *) __dest->__bits)[__i] = __arr1[__i] op __arr2[__i];    \
 137       __dest; }))
 138
 139 # define __CPU_ALLOC_SIZE(count) \
 140   ((((count) + __NCPUBITS - 1) / __NCPUBITS) * sizeof (__cpu_mask))
 141 # define __CPU_ALLOC(count) __sched_cpualloc (count)
 142 # define __CPU_FREE(cpuset) __sched_cpufree (cpuset)
 143
 144 __BEGIN_DECLS
 145
 146 extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
 147      __THROW;
 148 extern cpu_set_t *__sched_cpualloc (size_t __count) __THROW __wur;
 149 extern void __sched_cpufree (cpu_set_t *__set) __THROW;
 150
 151 __END_DECLS
 152
 153 #endif