sched.h revision dd09699fae94e1d9d326c78cc6aa769701219bc7 
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
41struct sched_param {
42  int __sched_priority;
43};
44#define sched_priority __sched_priority
45
46extern int sched_setscheduler(pid_t, int, const struct sched_param*);
47extern int sched_getscheduler(pid_t);
48extern int sched_yield(void);
49extern int sched_get_priority_max(int);
50extern int sched_get_priority_min(int);
51extern int sched_setparam(pid_t, const struct sched_param*);
52extern int sched_getparam(pid_t, struct sched_param*);
53extern int sched_rr_get_interval(pid_t, struct timespec*);
54
55#ifdef _GNU_SOURCE
56
57extern int clone(int (*)(void*), void*, int, void*, ...);
58extern int unshare(int);
59extern int sched_getcpu(void);
60extern 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
73typedef struct {
74  __CPU_BITTYPE  __bits[ CPU_SETSIZE / __CPU_BITS ];
75} cpu_set_t;
76
77extern int sched_setaffinity(pid_t pid, size_t setsize, const cpu_set_t* set);
78
79extern 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
102extern cpu_set_t* __sched_cpualloc(size_t count);
103extern 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
147extern 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