1 /* Definitions for POSIX 1003.1b-1993 (aka POSIX.4) scheduling interface. 2 Copyright (C) 1996,1997,1999,2001-2004,2007,2010 3 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 #define _SCHED_H 1 23 24 #include <features.h> 25 26 /* Get type definitions. */ 27 #include <bits/types.h> 28 29 #define __need_size_t 30 #include <stddef.h> 31 32 #define __need_time_t 33 #define __need_timespec 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 */ 129
