mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 07:20:11 +00:00
98734cc501
extend_alloca was used to emulate VLA deallocation. The new version also handles the res == 0 corner case more explicitly, by returning 0 instead of the (potentially undefined, but usually zero) system call error.
108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
/* Copyright (C) 2003-2015 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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <pthreadP.h>
|
|
#include <sysdep.h>
|
|
#include <sys/types.h>
|
|
#include <shlib-compat.h>
|
|
|
|
|
|
size_t __kernel_cpumask_size attribute_hidden;
|
|
|
|
|
|
/* Determine the size of cpumask_t in the kernel. */
|
|
int
|
|
__determine_cpumask_size (pid_t tid)
|
|
{
|
|
size_t psize;
|
|
int res;
|
|
|
|
for (psize = 128; ; psize *= 2)
|
|
{
|
|
char buf[psize];
|
|
INTERNAL_SYSCALL_DECL (err);
|
|
|
|
res = INTERNAL_SYSCALL (sched_getaffinity, err, 3, tid, psize, buf);
|
|
if (INTERNAL_SYSCALL_ERROR_P (res, err))
|
|
{
|
|
if (INTERNAL_SYSCALL_ERRNO (res, err) != EINVAL)
|
|
return INTERNAL_SYSCALL_ERRNO (res, err);
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
|
|
if (res != 0)
|
|
__kernel_cpumask_size = res;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int
|
|
__pthread_setaffinity_new (pthread_t th, size_t cpusetsize,
|
|
const cpu_set_t *cpuset)
|
|
{
|
|
const struct pthread *pd = (const struct pthread *) th;
|
|
|
|
INTERNAL_SYSCALL_DECL (err);
|
|
int res;
|
|
|
|
if (__glibc_unlikely (__kernel_cpumask_size == 0))
|
|
{
|
|
res = __determine_cpumask_size (pd->tid);
|
|
if (res != 0)
|
|
return res;
|
|
}
|
|
|
|
/* We now know the size of the kernel cpumask_t. Make sure the user
|
|
does not request to set a bit beyond that. */
|
|
for (size_t 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;
|
|
|
|
res = INTERNAL_SYSCALL (sched_setaffinity, err, 3, pd->tid, cpusetsize,
|
|
cpuset);
|
|
|
|
#ifdef RESET_VGETCPU_CACHE
|
|
if (!INTERNAL_SYSCALL_ERROR_P (res, err))
|
|
RESET_VGETCPU_CACHE ();
|
|
#endif
|
|
|
|
return (INTERNAL_SYSCALL_ERROR_P (res, err)
|
|
? INTERNAL_SYSCALL_ERRNO (res, err)
|
|
: 0);
|
|
}
|
|
versioned_symbol (libpthread, __pthread_setaffinity_new,
|
|
pthread_setaffinity_np, GLIBC_2_3_4);
|
|
|
|
|
|
#if SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_3_4)
|
|
int
|
|
__pthread_setaffinity_old (pthread_t th, cpu_set_t *cpuset)
|
|
{
|
|
/* The old interface by default assumed a 1024 processor bitmap. */
|
|
return __pthread_setaffinity_new (th, 128, cpuset);
|
|
}
|
|
compat_symbol (libpthread, __pthread_setaffinity_old, pthread_setaffinity_np,
|
|
GLIBC_2_3_3);
|
|
#endif
|