bits/sched.h

   1 /* Definitions of constants and data structure for POSIX 1003.1b-1993
   2    scheduling interface.
   3    Copyright (C) 1996, 1997, 2001, 2003, 2007 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #ifndef _SCHED_H
  22 # error "Never include <bits/sched.h> directly; use <sched.h> instead."
  23 #endif
  24
  25
  26 /* Scheduling algorithms.  */
  27 #define SCHED_OTHER     0
  28 #define SCHED_FIFO      1
  29 #define SCHED_RR        2
  30
  31 /* Data structure to describe a process' schedulability.  */
  32 struct sched_param
  33 {
  34   int __sched_priority;
  35 };
  36
  37
  38 #if defined _SCHED_H && !defined __cpu_set_t_defined
  39 # define __cpu_set_t_defined
  40 /* Size definition for CPU sets.  */
  41 # define __CPU_SETSIZE  1024
  42 # define __NCPUBITS     (8 * sizeof (__cpu_mask))
  43
  44 /* Type for array elements in 'cpu_set'.  */
  45 typedef unsigned long int __cpu_mask;
  46
  47 /* Basic access functions.  */
  48 # define __CPUELT(cpu)  ((cpu) / __NCPUBITS)
  49 # define __CPUMASK(cpu) ((__cpu_mask) 1 << ((cpu) % __NCPUBITS))
  50
  51 /* Data structure to describe CPU mask.  */
  52 typedef struct
  53 {
  54   __cpu_mask __bits[__CPU_SETSIZE / __NCPUBITS];
  55 } cpu_set_t;
  56
  57 /* Access functions for CPU masks.  */
  58 # define __CPU_ZERO(cpusetp) \
  59   do {                                                                        \
  60     unsigned int __i;                                                         \
  61     cpu_set *__arr = (cpusetp);                                               \
  62     for (__i = 0; __i < sizeof (cpu_set) / sizeof (__cpu_mask); ++__i)        \
  63       __arr->__bits[__i] = 0;                                                 \
  64   } while (0)
  65 # define __CPU_SET(cpu, cpusetp) \
  66   ((cpusetp)->__bits[__CPUELT (cpu)] |= __CPUMASK (cpu))
  67 # define __CPU_CLR(cpu, cpusetp) \
  68   ((cpusetp)->__bits[__CPUELT (cpu)] &= ~__CPUMASK (cpu))
  69 # define __CPU_ISSET(cpu, cpusetp) \
  70   (((cpusetp)->__bits[__CPUELT (cpu)] & __CPUMASK (cpu)) != 0)
  71
  72 __BEGIN_DECLS
  73
  74 extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
  75      __THROW;
  76
  77 __END_DECLS
  78
  79 # define __CPU_COUNT(cpusetp) \
  80   __sched_cpucount (sizeof (cpu_set_t), cpusetp)
  81 #endif