1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 #ifndef _SCHED_H_ 29 #define _SCHED_H_ 30 31 #include <sys/cdefs.h> 32 #include <sys/time.h> 33 34 #include <linux/sched.h> 35 36 __BEGIN_DECLS 37 38 /* This name is used by glibc, but not by the kernel. */ 39 #define SCHED_OTHER SCHED_NORMAL 40 41 struct sched_param { 42 int __sched_priority; 43 }; 44 #define sched_priority __sched_priority 45 46 extern int sched_setscheduler(pid_t, int, const struct sched_param*); 47 extern int sched_getscheduler(pid_t); 48 extern int sched_yield(void); 49 extern int sched_get_priority_max(int); 50 extern int sched_get_priority_min(int); 51 extern int sched_setparam(pid_t, const struct sched_param*); 52 extern int sched_getparam(pid_t, struct sched_param*); 53 extern int sched_rr_get_interval(pid_t, struct timespec*); 54 55 #ifdef _GNU_SOURCE 56 57 extern int clone(int (*)(void*), void*, int, void*, ...); 58 extern int unshare(int); 59 extern int sched_getcpu(void); 60 extern int setns(int, int); 61 62 #ifdef __LP64__ 63 #define CPU_SETSIZE 1024 64 #else 65 #define CPU_SETSIZE 32 66 #endif 67 68 #define __CPU_BITTYPE unsigned long int /* mandated by the kernel */ 69 #define __CPU_BITS (8 * sizeof(__CPU_BITTYPE)) 70 #define __CPU_ELT(x) ((x) / __CPU_BITS) 71 #define __CPU_MASK(x) ((__CPU_BITTYPE)1 << ((x) & (__CPU_BITS - 1))) 72 73 typedef struct { 74 __CPU_BITTYPE __bits[ CPU_SETSIZE / __CPU_BITS ]; 75 } cpu_set_t; 76 77 extern int sched_setaffinity(pid_t pid, size_t setsize, const cpu_set_t* set); 78 79 extern int sched_getaffinity(pid_t pid, size_t setsize, cpu_set_t* set); 80 81 #define CPU_ZERO(set) CPU_ZERO_S(sizeof(cpu_set_t), set) 82 #define CPU_SET(cpu, set) CPU_SET_S(cpu, sizeof(cpu_set_t), set) 83 #define CPU_CLR(cpu, set) CPU_CLR_S(cpu, sizeof(cpu_set_t), set) 84 #define CPU_ISSET(cpu, set) CPU_ISSET_S(cpu, sizeof(cpu_set_t), set) 85 #define CPU_COUNT(set) CPU_COUNT_S(sizeof(cpu_set_t), set) 86 #define CPU_EQUAL(set1, set2) CPU_EQUAL_S(sizeof(cpu_set_t), set1, set2) 87 88 #define CPU_AND(dst, set1, set2) __CPU_OP(dst, set1, set2, &) 89 #define CPU_OR(dst, set1, set2) __CPU_OP(dst, set1, set2, |) 90 #define CPU_XOR(dst, set1, set2) __CPU_OP(dst, set1, set2, ^) 91 92 #define __CPU_OP(dst, set1, set2, op) __CPU_OP_S(sizeof(cpu_set_t), dst, set1, set2, op) 93 94 /* Support for dynamically-allocated cpu_set_t */ 95 96 #define CPU_ALLOC_SIZE(count) \ 97 __CPU_ELT((count) + (__CPU_BITS - 1)) * sizeof(__CPU_BITTYPE) 98 99 #define CPU_ALLOC(count) __sched_cpualloc((count)) 100 #define CPU_FREE(set) __sched_cpufree((set)) 101 102 extern cpu_set_t* __sched_cpualloc(size_t count); 103 extern void __sched_cpufree(cpu_set_t* set); 104 105 #define CPU_ZERO_S(setsize, set) __builtin_memset(set, 0, setsize) 106 107 #define CPU_SET_S(cpu, setsize, set) \ 108 do { \ 109 size_t __cpu = (cpu); \ 110 if (__cpu < 8 * (setsize)) \ 111 (set)->__bits[__CPU_ELT(__cpu)] |= __CPU_MASK(__cpu); \ 112 } while (0) 113 114 #define CPU_CLR_S(cpu, setsize, set) \ 115 do { \ 116 size_t __cpu = (cpu); \ 117 if (__cpu < 8 * (setsize)) \ 118 (set)->__bits[__CPU_ELT(__cpu)] &= ~__CPU_MASK(__cpu); \ 119 } while (0) 120 121 #define CPU_ISSET_S(cpu, setsize, set) \ 122 (__extension__ ({ \ 123 size_t __cpu = (cpu); \ 124 (__cpu < 8 * (setsize)) \ 125 ? ((set)->__bits[__CPU_ELT(__cpu)] & __CPU_MASK(__cpu)) != 0 \ 126 : 0; \ 127 })) 128 129 #define CPU_EQUAL_S(setsize, set1, set2) (__builtin_memcmp(set1, set2, setsize) == 0) 130 131 #define CPU_AND_S(setsize, dst, set1, set2) __CPU_OP_S(setsize, dst, set1, set2, &) 132 #define CPU_OR_S(setsize, dst, set1, set2) __CPU_OP_S(setsize, dst, set1, set2, |) 133 #define CPU_XOR_S(setsize, dst, set1, set2) __CPU_OP_S(setsize, dst, set1, set2, ^) 134 135 #define __CPU_OP_S(setsize, dstset, srcset1, srcset2, op) \ 136 do { \ 137 cpu_set_t* __dst = (dstset); \ 138 const __CPU_BITTYPE* __src1 = (srcset1)->__bits; \ 139 const __CPU_BITTYPE* __src2 = (srcset2)->__bits; \ 140 size_t __nn = 0, __nn_max = (setsize)/sizeof(__CPU_BITTYPE); \ 141 for (; __nn < __nn_max; __nn++) \ 142 (__dst)->__bits[__nn] = __src1[__nn] op __src2[__nn]; \ 143 } while (0) 144 145 #define CPU_COUNT_S(setsize, set) __sched_cpucount((setsize), (set)) 146 147 extern int __sched_cpucount(size_t setsize, cpu_set_t* set); 148 149 #endif /* _GNU_SOURCE */ 150 151 __END_DECLS 152 153 #endif /* _SCHED_H_ */ 154