sysdeps/unix/sysv/linux/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 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 __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 #ifdef __USE_GNU
  33 # define SCHED_BATCH    3
  34 #endif
  35
  36 #ifdef __USE_MISC
  37 /* Cloning flags.  */
  38 # define CSIGNAL       0x000000ff /* Signal mask to be sent at exit.  */
  39 # define CLONE_VM      0x00000100 /* Set if VM shared between processes.  */
  40 # define CLONE_FS      0x00000200 /* Set if fs info shared between processes.  */
  41 # define CLONE_FILES   0x00000400 /* Set if open files shared between processes.  */
  42 # define CLONE_SIGHAND 0x00000800 /* Set if signal handlers shared.  */
  43 # define CLONE_PTRACE  0x00002000 /* Set if tracing continues on the child.  */
  44 # define CLONE_VFORK   0x00004000 /* Set if the parent wants the child to
  45                                      wake it up on mm_release.  */
  46 # define CLONE_PARENT  0x00008000 /* Set if we want to have the same
  47                                      parent as the cloner.  */
  48 # define CLONE_THREAD  0x00010000 /* Set to add to same thread group.  */
  49 # define CLONE_NEWNS   0x00020000 /* Set to create new namespace.  */
  50 # define CLONE_SYSVSEM 0x00040000 /* Set to shared SVID SEM_UNDO semantics.  */
  51 # define CLONE_SETTLS  0x00080000 /* Set TLS info.  */
  52 # define CLONE_PARENT_SETTID 0x00100000 /* Store TID in userlevel buffer
  53                                            before MM copy.  */
  54 # define CLONE_CHILD_CLEARTID 0x00200000 /* Register exit futex and memory
  55                                             location to clear.  */
  56 # define CLONE_DETACHED 0x00400000 /* Create clone detached.  */
  57 # define CLONE_UNTRACED 0x00800000 /* Set if the tracing process can't
  58                                       force CLONE_PTRACE on this clone.  */
  59 # define CLONE_CHILD_SETTID 0x01000000 /* Store TID in userlevel buffer in
  60                                           the child.  */
  61 # define CLONE_STOPPED  0x02000000 /* Start in stopped state.  */
  62 #endif
  63
  64 /* The official definition.  */
  65 struct sched_param
  66   {
  67     int __sched_priority;
  68   };
  69
  70 __BEGIN_DECLS
  71
  72 #ifdef __USE_MISC
  73 /* Clone current process.  */
  74 extern int clone (int (*__fn) (void *__arg), void *__child_stack,
  75                   int __flags, void *__arg, ...) __THROW;
  76
  77 /* Unshare the specified resources.  */
  78 extern int unshare (int __flags) __THROW;
  79 #endif
  80
  81 __END_DECLS
  82
  83 #endif  /* need schedparam */
  84
  85 #if !defined __defined_schedparam \
  86     && (defined __need_schedparam || defined _SCHED_H)
  87 # define __defined_schedparam   1
  88 /* Data structure to describe a process' schedulability.  */
  89 struct __sched_param
  90   {
  91     int __sched_priority;
  92   };
  93 # undef __need_schedparam
  94 #endif
  95
  96
  97 #if defined _SCHED_H && !defined __cpu_set_t_defined
  98 # define __cpu_set_t_defined
  99 /* Size definition for CPU sets.  */
 100 # define __CPU_SETSIZE  1024
 101 # define __NCPUBITS     (8 * sizeof (__cpu_mask))
 102
 103 /* Type for array elements in 'cpu_set'.  */
 104 typedef unsigned long int __cpu_mask;
 105
 106 /* Basic access functions.  */
 107 # define __CPUELT(cpu)  ((cpu) / __NCPUBITS)
 108 # define __CPUMASK(cpu) ((__cpu_mask) 1 << ((cpu) % __NCPUBITS))
 109
 110 /* Data structure to describe CPU mask.  */
 111 typedef struct
 112 {
 113   __cpu_mask __bits[__CPU_SETSIZE / __NCPUBITS];
 114 } cpu_set_t;
 115
 116 /* Access functions for CPU masks.  */
 117 # define __CPU_ZERO(cpusetp) \
 118   do {                                                                        \
 119     unsigned int __i;                                                         \
 120     cpu_set_t *__arr = (cpusetp);                                             \
 121     for (__i = 0; __i < sizeof (cpu_set_t) / sizeof (__cpu_mask); ++__i)      \
 122       __arr->__bits[__i] = 0;                                                 \
 123   } while (0)
 124 # define __CPU_SET(cpu, cpusetp) \
 125   ((cpusetp)->__bits[__CPUELT (cpu)] |= __CPUMASK (cpu))
 126 # define __CPU_CLR(cpu, cpusetp) \
 127   ((cpusetp)->__bits[__CPUELT (cpu)] &= ~__CPUMASK (cpu))
 128 # define __CPU_ISSET(cpu, cpusetp) \
 129   (((cpusetp)->__bits[__CPUELT (cpu)] & __CPUMASK (cpu)) != 0)
 130 #endif