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 <bits/timespec.h>
32#include <linux/sched.h>
33#include <sys/cdefs.h>
34
35__BEGIN_DECLS
36
37/* This name is used by glibc, but not by the kernel. */
38#define SCHED_OTHER SCHED_NORMAL
39
40struct sched_param {
41  int sched_priority;
42};
43
44extern int sched_setscheduler(pid_t, int, const struct sched_param*);
45extern int sched_getscheduler(pid_t);
46extern int sched_yield(void);
47extern int sched_get_priority_max(int);
48extern int sched_get_priority_min(int);
49extern int sched_setparam(pid_t, const struct sched_param*);
50extern int sched_getparam(pid_t, struct sched_param*);
51extern int sched_rr_get_interval(pid_t, struct timespec*);
52
53#if defined(__USE_GNU)
54
55extern int clone(int (*)(void*), void*, int, void*, ...);
56extern int unshare(int);
57extern int sched_getcpu(void);
58extern int setns(int, int);
59
60#ifdef __LP64__
61#define CPU_SETSIZE 1024
62#else
63#define CPU_SETSIZE 32
64#endif
65
66#define __CPU_BITTYPE  unsigned long int  /* mandated by the kernel  */
67#define __CPU_BITS     (8 * sizeof(__CPU_BITTYPE))
68#define __CPU_ELT(x)   ((x) / __CPU_BITS)
69#define __CPU_MASK(x)  ((__CPU_BITTYPE)1 << ((x) & (__CPU_BITS - 1)))
70
71typedef struct {
72  __CPU_BITTYPE  __bits[ CPU_SETSIZE / __CPU_BITS ];
73} cpu_set_t;
74
75extern int sched_setaffinity(pid_t pid, size_t setsize, const cpu_set_t* set);
76
77extern int sched_getaffinity(pid_t pid, size_t setsize, cpu_set_t* set);
78
79#define CPU_ZERO(set)          CPU_ZERO_S(sizeof(cpu_set_t), set)
80#define CPU_SET(cpu, set)      CPU_SET_S(cpu, sizeof(cpu_set_t), set)
81#define CPU_CLR(cpu, set)      CPU_CLR_S(cpu, sizeof(cpu_set_t), set)
82#define CPU_ISSET(cpu, set)    CPU_ISSET_S(cpu, sizeof(cpu_set_t), set)
83#define CPU_COUNT(set)         CPU_COUNT_S(sizeof(cpu_set_t), set)
84#define CPU_EQUAL(set1, set2)  CPU_EQUAL_S(sizeof(cpu_set_t), set1, set2)
85
86#define CPU_AND(dst, set1, set2)  __CPU_OP(dst, set1, set2, &)
87#define CPU_OR(dst, set1, set2)   __CPU_OP(dst, set1, set2, |)
88#define CPU_XOR(dst, set1, set2)  __CPU_OP(dst, set1, set2, ^)
89
90#define __CPU_OP(dst, set1, set2, op)  __CPU_OP_S(sizeof(cpu_set_t), dst, set1, set2, op)
91
92/* Support for dynamically-allocated cpu_set_t */
93
94#define CPU_ALLOC_SIZE(count) \
95  __CPU_ELT((count) + (__CPU_BITS - 1)) * sizeof(__CPU_BITTYPE)
96
97#define CPU_ALLOC(count)  __sched_cpualloc((count))
98#define CPU_FREE(set)     __sched_cpufree((set))
99
100extern cpu_set_t* __sched_cpualloc(size_t count);
101extern void       __sched_cpufree(cpu_set_t* set);
102
103#define CPU_ZERO_S(setsize, set)  __builtin_memset(set, 0, setsize)
104
105#define CPU_SET_S(cpu, setsize, set) \
106  do { \
107    size_t __cpu = (cpu); \
108    if (__cpu < 8 * (setsize)) \
109      (set)->__bits[__CPU_ELT(__cpu)] |= __CPU_MASK(__cpu); \
110  } while (0)
111
112#define CPU_CLR_S(cpu, setsize, set) \
113  do { \
114    size_t __cpu = (cpu); \
115    if (__cpu < 8 * (setsize)) \
116      (set)->__bits[__CPU_ELT(__cpu)] &= ~__CPU_MASK(__cpu); \
117  } while (0)
118
119#define CPU_ISSET_S(cpu, setsize, set) \
120  (__extension__ ({ \
121    size_t __cpu = (cpu); \
122    (__cpu < 8 * (setsize)) \
123      ? ((set)->__bits[__CPU_ELT(__cpu)] & __CPU_MASK(__cpu)) != 0 \
124      : 0; \
125  }))
126
127#define CPU_EQUAL_S(setsize, set1, set2)  (__builtin_memcmp(set1, set2, setsize) == 0)
128
129#define CPU_AND_S(setsize, dst, set1, set2)  __CPU_OP_S(setsize, dst, set1, set2, &)
130#define CPU_OR_S(setsize, dst, set1, set2)   __CPU_OP_S(setsize, dst, set1, set2, |)
131#define CPU_XOR_S(setsize, dst, set1, set2)  __CPU_OP_S(setsize, dst, set1, set2, ^)
132
133#define __CPU_OP_S(setsize, dstset, srcset1, srcset2, op) \
134  do { \
135    cpu_set_t* __dst = (dstset); \
136    const __CPU_BITTYPE* __src1 = (srcset1)->__bits; \
137    const __CPU_BITTYPE* __src2 = (srcset2)->__bits; \
138    size_t __nn = 0, __nn_max = (setsize)/sizeof(__CPU_BITTYPE); \
139    for (; __nn < __nn_max; __nn++) \
140      (__dst)->__bits[__nn] = __src1[__nn] op __src2[__nn]; \
141  } while (0)
142
143#define CPU_COUNT_S(setsize, set)  __sched_cpucount((setsize), (set))
144
145extern int __sched_cpucount(size_t setsize, cpu_set_t* set);
146
147#endif /* __USE_GNU */
148
149__END_DECLS
150
151#endif /* _SCHED_H_ */
152