f14fb60209
* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
154 lines
3.6 KiB
C
154 lines
3.6 KiB
C
/* $NetBSD: cpuset.c,v 1.18 2012/03/09 15:41:16 christos Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2008 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Christos Zoulas.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 _STANDALONE
|
|
#include <sys/cdefs.h>
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
__RCSID("$NetBSD: cpuset.c,v 1.18 2012/03/09 15:41:16 christos Exp $");
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/sched.h>
|
|
#ifdef _KERNEL
|
|
#include <sys/kmem.h>
|
|
#include <lib/libkern/libkern.h>
|
|
#include <sys/atomic.h>
|
|
#else
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <sys/sysctl.h>
|
|
#endif
|
|
|
|
#define CPUSET_SHIFT 5
|
|
#define CPUSET_MASK 31
|
|
#define CPUSET_NENTRIES(nc) ((nc) > 32 ? ((nc) >> CPUSET_SHIFT) : 1)
|
|
#ifndef __lint__
|
|
#define CPUSET_SIZE(n) (sizeof( \
|
|
struct { \
|
|
uint32_t bits[0]; \
|
|
}) + sizeof(uint32_t) * (n))
|
|
#else
|
|
#define CPUSET_SIZE(n) 0
|
|
#endif
|
|
|
|
struct _cpuset {
|
|
uint32_t bits[0];
|
|
};
|
|
|
|
#ifndef _KERNEL
|
|
|
|
static size_t cpuset_size = 0;
|
|
static size_t cpuset_nentries = 0;
|
|
|
|
size_t
|
|
/*ARGSUSED*/
|
|
_cpuset_size(const cpuset_t *c)
|
|
{
|
|
|
|
return cpuset_size;
|
|
}
|
|
|
|
void
|
|
_cpuset_zero(cpuset_t *c)
|
|
{
|
|
|
|
memset(c->bits, 0, cpuset_nentries * sizeof(c->bits[0]));
|
|
}
|
|
|
|
int
|
|
_cpuset_isset(cpuid_t i, const cpuset_t *c)
|
|
{
|
|
const unsigned long j = i >> CPUSET_SHIFT;
|
|
|
|
if (j >= cpuset_nentries) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
return ((1 << (unsigned int)(i & CPUSET_MASK)) & c->bits[j]) != 0;
|
|
}
|
|
|
|
int
|
|
_cpuset_set(cpuid_t i, cpuset_t *c)
|
|
{
|
|
const unsigned long j = i >> CPUSET_SHIFT;
|
|
|
|
if (j >= cpuset_nentries) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
c->bits[j] |= 1 << (unsigned int)(i & CPUSET_MASK);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
_cpuset_clr(cpuid_t i, cpuset_t *c)
|
|
{
|
|
const unsigned long j = i >> CPUSET_SHIFT;
|
|
|
|
if (j >= cpuset_nentries) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
c->bits[j] &= ~(1 << (unsigned int)(i & CPUSET_MASK));
|
|
return 0;
|
|
}
|
|
|
|
cpuset_t *
|
|
_cpuset_create(void)
|
|
{
|
|
|
|
if (cpuset_size == 0) {
|
|
static int mib[2] = { CTL_HW, HW_NCPU };
|
|
size_t len;
|
|
u_int nc;
|
|
|
|
len = sizeof(nc);
|
|
if (sysctl(mib, (unsigned int)__arraycount(mib), &nc, &len,
|
|
NULL, 0) == -1)
|
|
return NULL;
|
|
|
|
cpuset_nentries = CPUSET_NENTRIES(nc);
|
|
cpuset_size = CPUSET_SIZE(cpuset_nentries);
|
|
}
|
|
return calloc(1, cpuset_size);
|
|
}
|
|
|
|
void
|
|
_cpuset_destroy(cpuset_t *c)
|
|
{
|
|
|
|
free(c);
|
|
}
|
|
|
|
#endif
|
|
#endif
|