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util-linux/include/cpuset.h

99 lines
3.1 KiB

/*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#ifndef UTIL_LINUX_CPUSET_H
#define UTIL_LINUX_CPUSET_H
#include <sched.h>
/*
* Fallback for old or obscure libcs without dynamically allocated cpusets
*
* The following macros are based on code from glibc.
*
* The GNU C Library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*/
#if !HAVE_DECL_CPU_ALLOC
# define CPU_ZERO_S(setsize, cpusetp) \
do { \
size_t __i; \
size_t __imax = (setsize) / sizeof (__cpu_mask); \
__cpu_mask *__bits = (cpusetp)->__bits; \
for (__i = 0; __i < __imax; ++__i) \
__bits[__i] = 0; \
} while (0)
# define CPU_SET_S(cpu, setsize, cpusetp) \
({ size_t __cpu = (cpu); \
__cpu < 8 * (setsize) \
? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \
|= __CPUMASK (__cpu)) \
: 0; })
# define CPU_ISSET_S(cpu, setsize, cpusetp) \
({ size_t __cpu = (cpu); \
__cpu < 8 * (setsize) \
? ((((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \
& __CPUMASK (__cpu))) != 0 \
: 0; })
# define CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
({ __cpu_mask *__arr1 = (cpusetp1)->__bits; \
__cpu_mask *__arr2 = (cpusetp2)->__bits; \
size_t __imax = (setsize) / sizeof (__cpu_mask); \
size_t __i; \
for (__i = 0; __i < __imax; ++__i) \
if (__arr1[__i] != __arr2[__i]) \
break; \
__i == __imax; })
extern int __cpuset_count_s(size_t setsize, const cpu_set_t *set);
# define CPU_COUNT_S(setsize, cpusetp) __cpuset_count_s(setsize, cpusetp)
# define CPU_ALLOC_SIZE(count) \
((((count) + __NCPUBITS - 1) / __NCPUBITS) * sizeof (__cpu_mask))
# define CPU_ALLOC(count) (malloc(CPU_ALLOC_SIZE(count)))
# define CPU_FREE(cpuset) (free(cpuset))
#endif /* !HAVE_DECL_CPU_ALLOC */
#define cpuset_nbits(setsize) (8 * (setsize))
/*
* The @idx parameter returns an index of the first mask from @ary array where
* the @cpu is set.
*
* Returns: 0 if found, otherwise 1.
*/
static inline int cpuset_ary_isset(size_t cpu, cpu_set_t **ary, size_t nmemb,
size_t setsize, size_t *idx)
{
size_t i;
for (i = 0; i < nmemb; i++) {
if (CPU_ISSET_S(cpu, setsize, ary[i])) {
*idx = i;
return 0;
}
}
return 1;
}
extern int get_max_number_of_cpus(void);
extern cpu_set_t *cpuset_alloc(int ncpus, size_t *setsize, size_t *nbits);
extern void cpuset_free(cpu_set_t *set);
extern char *cpulist_create(char *str, size_t len, cpu_set_t *set, size_t setsize);
extern int cpulist_parse(const char *str, cpu_set_t *set, size_t setsize, int fail);
extern char *cpumask_create(char *str, size_t len, cpu_set_t *set, size_t setsize);
extern int cpumask_parse(const char *str, cpu_set_t *set, size_t setsize);
#endif /* UTIL_LINUX_CPUSET_H */