include/sched.h

   1 /* Definitions for POSIX 1003.1b-1993 (aka POSIX.4) scheduling interface.
   2    Copyright (C) 1996,1997,1999,2001-2004,2007 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _SCHED_H
  20 #define _SCHED_H        1
  21
  22 #include <features.h>
  23
  24 /* Get type definitions.  */
  25 #include <bits/types.h>
  26
  27 #define __need_size_t
  28 #include <stddef.h>
  29
  30 #define __need_timespec
  31 #include <time.h>
  32
  33 /* Get system specific constant and data structure definitions.  */
  34 #include <bits/sched.h>
  35 /* Define the real names for the elements of `struct sched_param'.  */
  36 #define sched_priority  __sched_priority
  37
  38
  39 __BEGIN_DECLS
  40
  41 /* Set scheduling parameters for a process.  */
  42 extern int sched_setparam (__pid_t __pid, const struct sched_param *__param)
  43      __THROW;
  44
  45 /* Retrieve scheduling parameters for a particular process.  */
  46 extern int sched_getparam (__pid_t __pid, struct sched_param *__param) __THROW;
  47
  48 /* Set scheduling algorithm and/or parameters for a process.  */
  49 extern int sched_setscheduler (__pid_t __pid, int __policy,
  50                                const struct sched_param *__param) __THROW;
  51
  52 /* Retrieve scheduling algorithm for a particular purpose.  */
  53 extern int sched_getscheduler (__pid_t __pid) __THROW;
  54
  55 /* Yield the processor.  */
  56 extern int sched_yield (void) __THROW;
  57
  58 /* Get maximum priority value for a scheduler.  */
  59 extern int sched_get_priority_max (int __algorithm) __THROW;
  60
  61 /* Get minimum priority value for a scheduler.  */
  62 extern int sched_get_priority_min (int __algorithm) __THROW;
  63
  64 /* Get the SCHED_RR interval for the named process.  */
  65 extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __THROW;
  66
  67
  68 #if defined __USE_GNU && defined __UCLIBC_LINUX_SPECIFIC__
  69 /* Access macros for `cpu_set'.  */
  70 # define CPU_SETSIZE __CPU_SETSIZE
  71 # define CPU_SET(cpu, cpusetp)   __CPU_SET_S (cpu, sizeof (cpu_set_t), cpusetp)
  72 # define CPU_CLR(cpu, cpusetp)   __CPU_CLR_S (cpu, sizeof (cpu_set_t), cpusetp)
  73 # define CPU_ISSET(cpu, cpusetp) __CPU_ISSET_S (cpu, sizeof (cpu_set_t), \
  74                                                 cpusetp)
  75 # define CPU_ZERO(cpusetp)       __CPU_ZERO_S (sizeof (cpu_set_t), cpusetp)
  76 # define CPU_COUNT(cpusetp)      __CPU_COUNT_S (sizeof (cpu_set_t), cpusetp)
  77
  78 # define CPU_SET_S(cpu, setsize, cpusetp)   __CPU_SET_S (cpu, setsize, cpusetp)
  79 # define CPU_CLR_S(cpu, setsize, cpusetp)   __CPU_CLR_S (cpu, setsize, cpusetp)
  80 # define CPU_ISSET_S(cpu, setsize, cpusetp) __CPU_ISSET_S (cpu, setsize, \
  81                                                            cpusetp)
  82 # define CPU_ZERO_S(setsize, cpusetp)       __CPU_ZERO_S (setsize, cpusetp)
  83 # define CPU_COUNT_S(setsize, cpusetp)      __CPU_COUNT_S (setsize, cpusetp)
  84
  85 # define CPU_EQUAL(cpusetp1, cpusetp2) \
  86   __CPU_EQUAL_S (sizeof (cpu_set_t), cpusetp1, cpusetp2)
  87 # define CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
  88   __CPU_EQUAL_S (setsize, cpusetp1, cpusetp2)
  89
  90 # define CPU_AND(destset, srcset1, srcset2) \
  91   __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, &)
  92 # define CPU_OR(destset, srcset1, srcset2) \
  93   __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, |)
  94 # define CPU_XOR(destset, srcset1, srcset2) \
  95   __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, ^)
  96 # define CPU_AND_S(setsize, destset, srcset1, srcset2) \
  97   __CPU_OP_S (setsize, destset, srcset1, srcset2, &)
  98 # define CPU_OR_S(setsize, destset, srcset1, srcset2) \
  99   __CPU_OP_S (setsize, destset, srcset1, srcset2, |)
 100 # define CPU_XOR_S(setsize, destset, srcset1, srcset2) \
 101   __CPU_OP_S (setsize, destset, srcset1, srcset2, ^)
 102
 103 # define CPU_ALLOC_SIZE(count) __CPU_ALLOC_SIZE (count)
 104 # define CPU_ALLOC(count) __CPU_ALLOC (count)
 105 # define CPU_FREE(cpuset) __CPU_FREE (cpuset)
 106
 107
 108 /* Set the CPU affinity for a task */
 109 extern int sched_setaffinity (__pid_t __pid, size_t __cpusetsize,
 110                               const cpu_set_t *__cpuset) __THROW;
 111
 112 /* Get the CPU affinity for a task */
 113 extern int sched_getaffinity (__pid_t __pid, size_t __cpusetsize,
 114                               cpu_set_t *__cpuset) __THROW;
 115
 116 # ifdef _LIBC
 117 extern int __clone (int (*__fn) (void *__arg), void *__child_stack,
 118                     int __flags, void *__arg, ...);
 119 extern int __clone2 (int (*__fn) (void *__arg), void *__child_stack_base,
 120                      size_t __child_stack_size, int __flags, void *__arg, ...);
 121 # endif
 122
 123 #endif
 124
 125 __END_DECLS
 126
 127 #endif /* sched.h */