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, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20 #ifndef _SCHED_H 21 #define _SCHED_H 1 22 23 #include <features.h> 24 25 /* Get type definitions. */ 26 #include <bits/types.h> 27 28 #define __need_size_t 29 #include <stddef.h> 30 31 #define __need_timespec 32 #include <time.h> 33 34 /* Get system specific constant and data structure definitions. */ 35 #include <bits/sched.h> 36 /* Define the real names for the elements of `struct sched_param'. */ 37 #define sched_priority __sched_priority 38 39 40 __BEGIN_DECLS 41 42 /* Set scheduling parameters for a process. */ 43 extern int sched_setparam (__pid_t __pid, __const struct sched_param *__param) 44 __THROW; 45 46 /* Retrieve scheduling parameters for a particular process. */ 47 extern int sched_getparam (__pid_t __pid, struct sched_param *__param) __THROW; 48 49 /* Set scheduling algorithm and/or parameters for a process. */ 50 extern int sched_setscheduler (__pid_t __pid, int __policy, 51 __const struct sched_param *__param) __THROW; 52 53 /* Retrieve scheduling algorithm for a particular purpose. */ 54 extern int sched_getscheduler (__pid_t __pid) __THROW; 55 56 /* Yield the processor. */ 57 extern int sched_yield (void) __THROW; 58 59 /* Get maximum priority value for a scheduler. */ 60 extern int sched_get_priority_max (int __algorithm) __THROW; 61 62 /* Get minimum priority value for a scheduler. */ 63 extern int sched_get_priority_min (int __algorithm) __THROW; 64 65 /* Get the SCHED_RR interval for the named process. */ 66 extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __THROW; 67 68 69 #ifdef __USE_GNU 70 /* Access macros for `cpu_set'. */ 71 # define CPU_SETSIZE __CPU_SETSIZE 72 # define CPU_SET(cpu, cpusetp) __CPU_SET_S (cpu, sizeof (cpu_set_t), cpusetp) 73 # define CPU_CLR(cpu, cpusetp) __CPU_CLR_S (cpu, sizeof (cpu_set_t), cpusetp) 74 # define CPU_ISSET(cpu, cpusetp) __CPU_ISSET_S (cpu, sizeof (cpu_set_t), \ 75 cpusetp) 76 # define CPU_ZERO(cpusetp) __CPU_ZERO_S (sizeof (cpu_set_t), cpusetp) 77 # define CPU_COUNT(cpusetp) __CPU_COUNT_S (sizeof (cpu_set_t), cpusetp) 78 79 # define CPU_SET_S(cpu, setsize, cpusetp) __CPU_SET_S (cpu, setsize, cpusetp) 80 # define CPU_CLR_S(cpu, setsize, cpusetp) __CPU_CLR_S (cpu, setsize, cpusetp) 81 # define CPU_ISSET_S(cpu, setsize, cpusetp) __CPU_ISSET_S (cpu, setsize, \ 82 cpusetp) 83 # define CPU_ZERO_S(setsize, cpusetp) __CPU_ZERO_S (setsize, cpusetp) 84 # define CPU_COUNT_S(setsize, cpusetp) __CPU_COUNT_S (setsize, cpusetp) 85 86 # define CPU_EQUAL(cpusetp1, cpusetp2) \ 87 __CPU_EQUAL_S (sizeof (cpu_set_t), cpusetp1, cpusetp2) 88 # define CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \ 89 __CPU_EQUAL_S (setsize, cpusetp1, cpusetp2) 90 91 # define CPU_AND(destset, srcset1, srcset2) \ 92 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, &) 93 # define CPU_OR(destset, srcset1, srcset2) \ 94 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, |) 95 # define CPU_XOR(destset, srcset1, srcset2) \ 96 __CPU_OP_S (sizeof (cpu_set_t), destset, srcset1, srcset2, ^) 97 # define CPU_AND_S(setsize, destset, srcset1, srcset2) \ 98 __CPU_OP_S (setsize, destset, srcset1, srcset2, &) 99 # define CPU_OR_S(setsize, destset, srcset1, srcset2) \ 100 __CPU_OP_S (setsize, destset, srcset1, srcset2, |) 101 # define CPU_XOR_S(setsize, destset, srcset1, srcset2) \ 102 __CPU_OP_S (setsize, destset, srcset1, srcset2, ^) 103 104 # define CPU_ALLOC_SIZE(count) __CPU_ALLOC_SIZE (count) 105 # define CPU_ALLOC(count) __CPU_ALLOC (count) 106 # define CPU_FREE(cpuset) __CPU_FREE (cpuset) 107 108 109 /* Set the CPU affinity for a task */ 110 extern int sched_setaffinity (__pid_t __pid, size_t __cpusetsize, 111 __const cpu_set_t *__cpuset) __THROW; 112 113 /* Get the CPU affinity for a task */ 114 extern int sched_getaffinity (__pid_t __pid, size_t __cpusetsize, 115 cpu_set_t *__cpuset) __THROW; 116 #endif 117 118 __END_DECLS 119 120 #endif /* sched.h */ 121