posix/sched.h

   1 /* Definitions for POSIX 1003.1b-1993 (aka POSIX.4) scheduling interface.
   2    Copyright (C) 1996-2015 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 #ifdef __USE_XOPEN2K
  31 # define __need_time_t
  32 # define __need_timespec
  33 #endif
  34 #include <time.h>
  35
  36 #ifndef __pid_t_defined
  37 typedef __pid_t pid_t;
  38 # define __pid_t_defined
  39 #endif
  40
  41
  42 /* Get system specific constant and data structure definitions.  */
  43 #include <bits/sched.h>
  44 /* Define the real names for the elements of `struct sched_param'.  */
  45 #define sched_priority  __sched_priority
  46
  47
  48 __BEGIN_DECLS
  49
  50 /* Set scheduling parameters for a process.  */
  51 extern int sched_setparam (__pid_t __pid, const struct sched_param *__param)
  52      __THROW;
  53
  54 /* Retrieve scheduling parameters for a particular process.  */
  55 extern int sched_getparam (__pid_t __pid, struct sched_param *__param) __THROW;
  56
  57 /* Set scheduling algorithm and/or parameters for a process.  */
  58 extern int sched_setscheduler (__pid_t __pid, int __policy,
  59                                const struct sched_param *__param) __THROW;
  60
  61 /* Retrieve scheduling algorithm for a particular purpose.  */
  62 extern int sched_getscheduler (__pid_t __pid) __THROW;
  63
  64 /* Yield the processor.  */
  65 extern int sched_yield (void) __THROW;
  66
  67 /* Get maximum priority value for a scheduler.  */
  68 extern int sched_get_priority_max (int __algorithm) __THROW;
  69
  70 /* Get minimum priority value for a scheduler.  */
  71 extern int sched_get_priority_min (int __algorithm) __THROW;
  72
  73 /* Get the SCHED_RR interval for the named process.  */
  74 extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __THROW;
  75
  76
  77 #ifdef __USE_GNU
  78 /* Access macros for `cpu_set'.  */
  79 # define CPU_SETSIZE __CPU_SETSIZE
  80 # define CPU_SET(cpu, cpusetp)   __CPU_SET_S (cpu, sizeof (cpu_set_t), cpusetp)
  81 # define CPU_CLR(cpu, cpusetp)   __CPU_CLR_S (cpu, sizeof (cpu_set_t), cpusetp)
  82 # define CPU_ISSET(cpu, cpusetp) __CPU_ISSET_S (cpu, sizeof (cpu_set_t), \
  83                                                 cpusetp)
  84 # define CPU_ZERO(cpusetp)       __CPU_ZERO_S (sizeof (cpu_set_t), cpusetp)
  85 # define CPU_COUNT(cpusetp)      __CPU_COUNT_S (sizeof (cpu_set_t), cpusetp)
  86
  87 # define CPU_SET_S(cpu, setsize, cpusetp)   __CPU_SET_S (cpu, setsize, cpusetp)
  88 # define CPU_CLR_S(cpu, setsize, cpusetp)   __CPU_CLR_S (cpu, setsize, cpusetp)
  89 # define CPU_ISSET_S(cpu, setsize, cpusetp) __CPU_ISSET_S (cpu, setsize, \
  90                                                            cpusetp)
  91 # define CPU_ZERO_S(setsize, cpusetp)       __CPU_ZERO_S (setsize, cpusetp)
  92 # define CPU_COUNT_S(setsize, cpusetp)      __CPU_COUNT_S (setsize, cpusetp)
  93
  94 # define CPU_EQUAL(cpusetp1, cpusetp2) \
  95   __CPU_EQUAL_S (sizeof (cpu_set_t), cpusetp1, cpusetp2)
  96 # define CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
  97   __CPU_EQUAL_S (setsize, cpusetp1, cpusetp2)
  98
  99 # define CPU_AND(destset, srcset1, srcset2) \
 100   __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, &)
 101 # define CPU_OR(destset, srcset1, srcset2) \
 102   __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, |)
 103 # define CPU_XOR(destset, srcset1, srcset2) \
 104   __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, ^)
 105 # define CPU_AND_S(setsize, destset, srcset1, srcset2) \
 106   __CPU_OP_S (setsize, destset, srcset1, srcset2, &)
 107 # define CPU_OR_S(setsize, destset, srcset1, srcset2) \
 108   __CPU_OP_S (setsize, destset, srcset1, srcset2, |)
 109 # define CPU_XOR_S(setsize, destset, srcset1, srcset2) \
 110   __CPU_OP_S (setsize, destset, srcset1, srcset2, ^)
 111
 112 # define CPU_ALLOC_SIZE(count) __CPU_ALLOC_SIZE (count)
 113 # define CPU_ALLOC(count) __CPU_ALLOC (count)
 114 # define CPU_FREE(cpuset) __CPU_FREE (cpuset)
 115
 116
 117 /* Set the CPU affinity for a task */
 118 extern int sched_setaffinity (__pid_t __pid, size_t __cpusetsize,
 119                               const cpu_set_t *__cpuset) __THROW;
 120
 121 /* Get the CPU affinity for a task */
 122 extern int sched_getaffinity (__pid_t __pid, size_t __cpusetsize,
 123                               cpu_set_t *__cpuset) __THROW;
 124 #endif
 125
 126 __END_DECLS
 127
 128 #endif /* sched.h */