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) 1996-2018 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 _BITS_SCHED_H
  21 #define _BITS_SCHED_H 1
  22
  23 #ifndef _SCHED_H
  24 # error "Never include <bits/sched.h> directly; use <sched.h> instead."
  25 #endif
  26
  27 /* Scheduling algorithms.  */
  28 #define SCHED_OTHER             0
  29 #define SCHED_FIFO              1
  30 #define SCHED_RR                2
  31 #ifdef __USE_GNU
  32 # define SCHED_BATCH            3
  33 # define SCHED_ISO              4
  34 # define SCHED_IDLE             5
  35 # define SCHED_DEADLINE         6
  36
  37 # define SCHED_RESET_ON_FORK    0x40000000
  38 #endif
  39
  40 #ifdef __USE_GNU
  41 /* Cloning flags.  */
  42 # define CSIGNAL       0x000000ff /* Signal mask to be sent at exit.  */
  43 # define CLONE_VM      0x00000100 /* Set if VM shared between processes.  */
  44 # define CLONE_FS      0x00000200 /* Set if fs info shared between processes.  */
  45 # define CLONE_FILES   0x00000400 /* Set if open files shared between processes.  */
  46 # define CLONE_SIGHAND 0x00000800 /* Set if signal handlers shared.  */
  47 # define CLONE_PTRACE  0x00002000 /* Set if tracing continues on the child.  */
  48 # define CLONE_VFORK   0x00004000 /* Set if the parent wants the child to
  49                                      wake it up on mm_release.  */
  50 # define CLONE_PARENT  0x00008000 /* Set if we want to have the same
  51                                      parent as the cloner.  */
  52 # define CLONE_THREAD  0x00010000 /* Set to add to same thread group.  */
  53 # define CLONE_NEWNS   0x00020000 /* Set to create new namespace.  */
  54 # define CLONE_SYSVSEM 0x00040000 /* Set to shared SVID SEM_UNDO semantics.  */
  55 # define CLONE_SETTLS  0x00080000 /* Set TLS info.  */
  56 # define CLONE_PARENT_SETTID 0x00100000 /* Store TID in userlevel buffer
  57                                            before MM copy.  */
  58 # define CLONE_CHILD_CLEARTID 0x00200000 /* Register exit futex and memory
  59                                             location to clear.  */
  60 # define CLONE_DETACHED 0x00400000 /* Create clone detached.  */
  61 # define CLONE_UNTRACED 0x00800000 /* Set if the tracing process can't
  62                                       force CLONE_PTRACE on this clone.  */
  63 # define CLONE_CHILD_SETTID 0x01000000 /* Store TID in userlevel buffer in
  64                                           the child.  */
  65 # define CLONE_NEWCGROUP    0x02000000  /* New cgroup namespace.  */
  66 # define CLONE_NEWUTS   0x04000000      /* New utsname group.  */
  67 # define CLONE_NEWIPC   0x08000000      /* New ipcs.  */
  68 # define CLONE_NEWUSER  0x10000000      /* New user namespace.  */
  69 # define CLONE_NEWPID   0x20000000      /* New pid namespace.  */
  70 # define CLONE_NEWNET   0x40000000      /* New network namespace.  */
  71 # define CLONE_IO       0x80000000      /* Clone I/O context.  */
  72 #endif
  73
  74 /* Data structure to describe a process' schedulability.  */
  75 struct sched_param
  76 {
  77   int sched_priority;
  78 };
  79
  80 __BEGIN_DECLS
  81
  82 #ifdef __USE_GNU
  83 /* Clone current process.  */
  84 extern int clone (int (*__fn) (void *__arg), void *__child_stack,
  85                   int __flags, void *__arg, ...) __THROW;
  86
  87 /* Unshare the specified resources.  */
  88 extern int unshare (int __flags) __THROW;
  89
  90 /* Get index of currently used CPU.  */
  91 extern int sched_getcpu (void) __THROW;
  92
  93 /* Switch process to namespace of type NSTYPE indicated by FD.  */
  94 extern int setns (int __fd, int __nstype) __THROW;
  95 #endif
  96
  97 __END_DECLS
  98
  99 #endif /* bits/sched.h */