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/* Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <pthreadP.h>
/* Defined in pthread_setaffinity.c. */
extern size_t __kernel_cpumask_size attribute_hidden;
extern int __determine_cpumask_size (pid_t tid);
libpthread_hidden_proto(__determine_cpumask_size)
int
pthread_attr_setaffinity_np (pthread_attr_t *attr, size_t cpusetsize,
const cpu_set_t *cpuset)
{
struct pthread_attr *iattr;
assert (sizeof (*attr) >= sizeof (struct pthread_attr));
iattr = (struct pthread_attr *) attr;
if (cpuset == NULL || cpusetsize == 0)
{
free (iattr->cpuset);
iattr->cpuset = NULL;
iattr->cpusetsize = 0;
}
else
{
if (__kernel_cpumask_size == 0)
{
int res = __determine_cpumask_size (THREAD_SELF->tid);
if (res != 0)
/* Some serious problem. */
return res;
}
/* Check whether the new bitmask has any bit set beyond the
last one the kernel accepts. */
size_t cnt;
for (cnt = __kernel_cpumask_size; cnt < cpusetsize; ++cnt)
if (((char *) cpuset)[cnt] != '\0')
/* Found a nonzero byte. This means the user request cannot be
fulfilled. */
return EINVAL;
if (iattr->cpusetsize != cpusetsize)
{
void *newp = (cpu_set_t *) realloc (iattr->cpuset, cpusetsize);
if (newp == NULL)
return ENOMEM;
iattr->cpuset = newp;
iattr->cpusetsize = cpusetsize;
}
memcpy (iattr->cpuset, cpuset, cpusetsize);
}
return 0;
}
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