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__ || defined L4_UCLIBC) 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 */ 128