/*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _SCHED_H_
#define _SCHED_H_
#include <sys/cdefs.h>
#include <sys/time.h>
__BEGIN_DECLS
#define SCHED_NORMAL 0
#define SCHED_OTHER 0
#define SCHED_FIFO 1
#define SCHED_RR 2
struct sched_param {
int sched_priority;
};
extern int sched_setscheduler(pid_t, int, const struct sched_param *);
extern int sched_getscheduler(pid_t);
extern int sched_yield(void);
extern int sched_get_priority_max(int policy);
extern int sched_get_priority_min(int policy);
extern int sched_setparam(pid_t, const struct sched_param *);
extern int sched_getparam(pid_t, struct sched_param *);
extern int sched_rr_get_interval(pid_t pid, struct timespec *tp);
#define CLONE_VM 0x00000100
#define CLONE_FS 0x00000200
#define CLONE_FILES 0x00000400
#define CLONE_SIGHAND 0x00000800
#define CLONE_PTRACE 0x00002000
#define CLONE_VFORK 0x00004000
#define CLONE_PARENT 0x00008000
#define CLONE_THREAD 0x00010000
#define CLONE_NEWNS 0x00020000
#define CLONE_SYSVSEM 0x00040000
#define CLONE_SETTLS 0x00080000
#define CLONE_PARENT_SETTID 0x00100000
#define CLONE_CHILD_CLEARTID 0x00200000
#define CLONE_DETACHED 0x00400000
#define CLONE_UNTRACED 0x00800000
#define CLONE_CHILD_SETTID 0x01000000
#define CLONE_STOPPED 0x02000000
#ifdef _GNU_SOURCE
extern int clone(int (*fn)(void *), void *child_stack, int flags, void* arg, ...);
extern int unshare(int);
#endif
/* Support for cpu thread affinity */
#ifdef _GNU_SOURCE
extern int sched_getcpu(void);
/* Our implementation supports up to 32 independent CPUs, which is also
* the maximum supported by the kernel at the moment. GLibc uses 1024 by
* default.
*
* If you want to use more than that, you should use CPU_ALLOC() / CPU_FREE()
* and the CPU_XXX_S() macro variants.
*/
#define CPU_SETSIZE 32
#define __CPU_BITTYPE unsigned long int /* mandated by the kernel */
#define __CPU_BITSHIFT 5 /* should be log2(BITTYPE) */
#define __CPU_BITS (1 << __CPU_BITSHIFT)
#define __CPU_ELT(x) ((x) >> __CPU_BITSHIFT)
#define __CPU_MASK(x) ((__CPU_BITTYPE)1 << ((x) & (__CPU_BITS-1)))
typedef struct {
__CPU_BITTYPE __bits[ CPU_SETSIZE / __CPU_BITS ];
} cpu_set_t;
extern int sched_setaffinity(pid_t pid, size_t setsize, const cpu_set_t* set);
extern int sched_getaffinity(pid_t pid, size_t setsize, cpu_set_t* set);
/* Provide optimized implementation for 32-bit cpu_set_t */
#if CPU_SETSIZE == __CPU_BITS
# define CPU_ZERO(set_) \
do{ \
(set_)->__bits[0] = 0; \
}while(0)
# define CPU_SET(cpu_,set_) \
do {\
size_t __cpu = (cpu_); \
if (__cpu < CPU_SETSIZE) \
(set_)->__bits[0] |= __CPU_MASK(__cpu); \
}while (0)
# define CPU_CLR(cpu_,set_) \
do {\
size_t __cpu = (cpu_); \
if (__cpu < CPU_SETSIZE) \
(set_)->__bits[0] &= ~__CPU_MASK(__cpu); \
}while (0)
# define CPU_ISSET(cpu_, set_) \
(__extension__({\
size_t __cpu = (cpu_); \
(cpu_ < CPU_SETSIZE) \
? ((set_)->__bits[0] & __CPU_MASK(__cpu)) != 0 \
: 0; \
}))
# define CPU_EQUAL(set1_, set2_) \
((set1_)->__bits[0] == (set2_)->__bits[0])
# define __CPU_OP(dst_, set1_, set2_, op_) \
do { \
(dst_)->__bits[0] = (set1_)->__bits[0] op_ (set2_)->__bits[0]; \
} while (0)
# define CPU_COUNT(set_) __builtin_popcountl((set_)->__bits[0])
#else /* CPU_SETSIZE != __CPU_BITS */
# define CPU_ZERO(set_) CPU_ZERO_S(sizeof(cpu_set_t), set_)
# define CPU_SET(cpu_,set_) CPU_SET_S(cpu_,sizeof(cpu_set_t),set_)
# define CPU_CLR(cpu_,set_) CPU_CLR_S(cpu_,sizeof(cpu_set_t),set_)
# define CPU_ISSET(cpu_,set_) CPU_ISSET_S(cpu_,sizeof(cpu_set_t),set_)
# define CPU_COUNT(set_) CPU_COUNT_S(sizeof(cpu_set_t),set_)
# define CPU_EQUAL(set1_,set2_) CPU_EQUAL_S(sizeof(cpu_set_t),set1_,set2_)
# define __CPU_OP(dst_,set1_,set2_,op_) __CPU_OP_S(sizeof(cpu_set_t),dst_,set1_,set2_,op_)
#endif /* CPU_SETSIZE != __CPU_BITS */
#define CPU_AND(set1_,set2_) __CPU_OP(set1_,set2_,&)
#define CPU_OR(set1_,set2_) __CPU_OP(set1_,set2_,|)
#define CPU_XOR(set1_,set2_) __CPU_OP(set1_,set2_,^)
/* Support for dynamically-allocated cpu_set_t */
#define CPU_ALLOC_SIZE(count) \
__CPU_ELT((count) + (__CPU_BITS-1))*sizeof(__CPU_BITTYPE)
#define CPU_ALLOC(count) __sched_cpualloc((count));
#define CPU_FREE(set) __sched_cpufree((set))
extern cpu_set_t* __sched_cpualloc(size_t count);
extern void __sched_cpufree(cpu_set_t* set);
#define CPU_ZERO_S(setsize_,set_) \
do { \
size_t __nn = 0; \
size_t __nn_max = (setsize_)/sizeof(__CPU_BITTYPE); \
for (; __nn < __nn_max; __nn++) \
(set_)->__bits[__nn] = 0; \
} while (0)
#define CPU_SET_S(cpu_,setsize_,set_) \
do { \
size_t __cpu = (cpu_); \
if (__cpu < 8*(setsize_)) \
(set_)->__bits[__CPU_ELT(__cpu)] |= __CPU_MASK(__cpu); \
} while (0)
#define CPU_CLR_S(cpu_,setsize_,set_) \
do { \
size_t __cpu = (cpu_); \
if (__cpu < 8*(setsize_)) \
(set_)->__bits[__CPU_ELT(__cpu)] &= ~__CPU_MASK(__cpu); \
} while (0)
#define CPU_ISSET_S(cpu_, setsize_, set_) \
(__extension__ ({ \
size_t __cpu = (cpu_); \
(__cpu < 8*(setsize_)) \
? ((set_)->__bits[__CPU_ELT(__cpu)] & __CPU_MASK(__cpu)) != 0 \
: 0; \
}))
#define CPU_EQUAL_S(setsize_, set1_, set2_) \
(__extension__ ({ \
__const __CPU_BITTYPE* __src1 = (set1_)->__bits; \
__const __CPU_BITTYPE* __src2 = (set2_)->__bits; \
size_t __nn = 0, __nn_max = (setsize_)/sizeof(__CPU_BITTYPE); \
for (; __nn < __nn_max; __nn++) { \
if (__src1[__nn] != __src2[__nn]) \
break; \
} \
__nn == __nn_max; \
}))
#define __CPU_OP_S(setsize_, dstset_, srcset1_, srcset2_, op) \
do { \
cpu_set_t* __dst = (dstset); \
const __CPU_BITTYPE* __src1 = (srcset1)->__bits; \
const __CPU_BITTYPE* __src2 = (srcset2)->__bits; \
size_t __nn = 0, __nn_max = (setsize_)/sizeof(__CPU_BITTYPE); \
for (; __nn < __nn_max; __nn++) \
(__dst)->__bits[__nn] = __src1[__nn] op __src2[__nn]; \
} while (0)
#define CPU_COUNT_S(setsize_, set_) \
__sched_cpucount((setsize_), (set_))
extern int __sched_cpucount(size_t setsize, cpu_set_t* set);
#endif /* _GNU_SOURCE */
__END_DECLS
#endif /* _SCHED_H_ */