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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.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <pthreadP.h>
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#include <sysdep.h>
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#include <sys/types.h>
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#include <shlib-compat.h>
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size_t __kernel_cpumask_size attribute_hidden;
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/* Determine the size of cpumask_t in the kernel. */
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int
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__determine_cpumask_size (pid_t tid)
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{
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size_t psize;
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int res;
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for (psize = 128; ; psize *= 2)
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{
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char buf[psize];
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INTERNAL_SYSCALL_DECL (err);
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res = INTERNAL_SYSCALL (sched_getaffinity, err, 3, tid, psize, buf);
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if (INTERNAL_SYSCALL_ERROR_P (res, err))
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{
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if (INTERNAL_SYSCALL_ERRNO (res, err) != EINVAL)
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return INTERNAL_SYSCALL_ERRNO (res, err);
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}
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else
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break;
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}
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if (res != 0)
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__kernel_cpumask_size = res;
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return 0;
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}
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int
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__pthread_setaffinity_new (pthread_t th, size_t cpusetsize,
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const cpu_set_t *cpuset)
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{
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const struct pthread *pd = (const struct pthread *) th;
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INTERNAL_SYSCALL_DECL (err);
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int res;
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if (__glibc_unlikely (__kernel_cpumask_size == 0))
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{
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res = __determine_cpumask_size (pd->tid);
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if (res != 0)
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return res;
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}
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/* We now know the size of the kernel cpumask_t. Make sure the user
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does not request to set a bit beyond that. */
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for (size_t cnt = __kernel_cpumask_size; cnt < cpusetsize; ++cnt)
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if (((char *) cpuset)[cnt] != '\0')
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/* Found a nonzero byte. This means the user request cannot be
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fulfilled. */
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return EINVAL;
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res = INTERNAL_SYSCALL (sched_setaffinity, err, 3, pd->tid, cpusetsize,
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cpuset);
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#ifdef RESET_VGETCPU_CACHE
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if (!INTERNAL_SYSCALL_ERROR_P (res, err))
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RESET_VGETCPU_CACHE ();
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#endif
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return (INTERNAL_SYSCALL_ERROR_P (res, err)
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? INTERNAL_SYSCALL_ERRNO (res, err)
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: 0);
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}
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versioned_symbol (libpthread, __pthread_setaffinity_new,
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pthread_setaffinity_np, GLIBC_2_3_4);
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#if SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_3_4)
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int
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__pthread_setaffinity_old (pthread_t th, cpu_set_t *cpuset)
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{
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/* The old interface by default assumed a 1024 processor bitmap. */
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return __pthread_setaffinity_new (th, 128, cpuset);
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}
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compat_symbol (libpthread, __pthread_setaffinity_old, pthread_setaffinity_np,
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GLIBC_2_3_3);
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#endif
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