1 /* Definitions for POSIX 1003.1b-1993 (aka POSIX.4) scheduling interface. 2 Copyright (C) 1996-2021 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 <https://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 #define __need_NULL 29 #include <stddef.h> 30 31 #include <bits/types/time_t.h> 32 #include <bits/types/struct_timespec.h> 33 #ifndef __USE_XOPEN2K 34 # include <time.h> 35 #endif 36 37 #ifndef __pid_t_defined 38 typedef __pid_t pid_t; 39 # define __pid_t_defined 40 #endif 41 42 /* Get system specific constant and data structure definitions. */ 43 #include <bits/sched.h> 44 #include <bits/cpu-set.h> 45 46 /* Backward compatibility. */ 47 #define sched_priority sched_priority 48 #define __sched_priority sched_priority 49 50 51 __BEGIN_DECLS 52 53 /* Set scheduling parameters for a process. */ 54 extern int sched_setparam (__pid_t __pid, const struct sched_param *__param) 55 __THROW; 56 57 /* Retrieve scheduling parameters for a particular process. */ 58 extern int sched_getparam (__pid_t __pid, struct sched_param *__param) __THROW; 59 60 /* Set scheduling algorithm and/or parameters for a process. */ 61 extern int sched_setscheduler (__pid_t __pid, int __policy, 62 const struct sched_param *__param) __THROW; 63 64 /* Retrieve scheduling algorithm for a particular purpose. */ 65 extern int sched_getscheduler (__pid_t __pid) __THROW; 66 67 /* Yield the processor. */ 68 extern int sched_yield (void) __THROW; 69 70 /* Get maximum priority value for a scheduler. */ 71 extern int sched_get_priority_max (int __algorithm) __THROW; 72 73 /* Get minimum priority value for a scheduler. */ 74 extern int sched_get_priority_min (int __algorithm) __THROW; 75 76 /* Get the SCHED_RR interval for the named process. */ 77 #ifndef __USE_TIME_BITS64 78 extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __THROW; 79 #else 80 # ifdef __REDIRECT_NTH 81 extern int __REDIRECT_NTH (sched_rr_get_interval, 82 (__pid_t __pid, struct timespec *__t), 83 __sched_rr_get_interval64); 84 # else 85 # define sched_rr_get_interval __sched_rr_get_interval64 86 # endif 87 #endif 88 89 #ifdef __USE_GNU 90 /* Access macros for `cpu_set'. */ 91 # define CPU_SETSIZE __CPU_SETSIZE 92 # define CPU_SET(cpu, cpusetp) __CPU_SET_S (cpu, sizeof (cpu_set_t), cpusetp) 93 # define CPU_CLR(cpu, cpusetp) __CPU_CLR_S (cpu, sizeof (cpu_set_t), cpusetp) 94 # define CPU_ISSET(cpu, cpusetp) __CPU_ISSET_S (cpu, sizeof (cpu_set_t), \ 95 cpusetp) 96 # define CPU_ZERO(cpusetp) __CPU_ZERO_S (sizeof (cpu_set_t), cpusetp) 97 # define CPU_COUNT(cpusetp) __CPU_COUNT_S (sizeof (cpu_set_t), cpusetp) 98 99 # define CPU_SET_S(cpu, setsize, cpusetp) __CPU_SET_S (cpu, setsize, cpusetp) 100 # define CPU_CLR_S(cpu, setsize, cpusetp) __CPU_CLR_S (cpu, setsize, cpusetp) 101 # define CPU_ISSET_S(cpu, setsize, cpusetp) __CPU_ISSET_S (cpu, setsize, \ 102 cpusetp) 103 # define CPU_ZERO_S(setsize, cpusetp) __CPU_ZERO_S (setsize, cpusetp) 104 # define CPU_COUNT_S(setsize, cpusetp) __CPU_COUNT_S (setsize, cpusetp) 105 106 # define CPU_EQUAL(cpusetp1, cpusetp2) \ 107 __CPU_EQUAL_S (sizeof (cpu_set_t), cpusetp1, cpusetp2) 108 # define CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \ 109 __CPU_EQUAL_S (setsize, cpusetp1, cpusetp2) 110 111 # define CPU_AND(destset, srcset1, srcset2) \ 112 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, &) 113 # define CPU_OR(destset, srcset1, srcset2) \ 114 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, |) 115 # define CPU_XOR(destset, srcset1, srcset2) \ 116 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, ^) 117 # define CPU_AND_S(setsize, destset, srcset1, srcset2) \ 118 __CPU_OP_S (setsize, destset, srcset1, srcset2, &) 119 # define CPU_OR_S(setsize, destset, srcset1, srcset2) \ 120 __CPU_OP_S (setsize, destset, srcset1, srcset2, |) 121 # define CPU_XOR_S(setsize, destset, srcset1, srcset2) \ 122 __CPU_OP_S (setsize, destset, srcset1, srcset2, ^) 123 124 # define CPU_ALLOC_SIZE(count) __CPU_ALLOC_SIZE (count) 125 # define CPU_ALLOC(count) __CPU_ALLOC (count) 126 # define CPU_FREE(cpuset) __CPU_FREE (cpuset) 127 128 129 /* Set the CPU affinity for a task */ 130 extern int sched_setaffinity (__pid_t __pid, size_t __cpusetsize, 131 const cpu_set_t *__cpuset) __THROW; 132 133 /* Get the CPU affinity for a task */ 134 extern int sched_getaffinity (__pid_t __pid, size_t __cpusetsize, 135 cpu_set_t *__cpuset) __THROW; 136 #endif 137 138 __END_DECLS 139 140 #endif /* sched.h */