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65 lines
2.1 KiB
C
65 lines
2.1 KiB
C
/* Copyright (C) 2002-2018 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>, 2002.
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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 <sched.h>
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#include <string.h>
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#include <sched.h>
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#include "pthreadP.h"
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#include <lowlevellock.h>
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int
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pthread_setschedprio (pthread_t threadid, int prio)
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{
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struct pthread *pd = (struct pthread *) threadid;
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/* Make sure the descriptor is valid. */
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if (INVALID_TD_P (pd))
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/* Not a valid thread handle. */
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return ESRCH;
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int result = 0;
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struct sched_param param;
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param.sched_priority = prio;
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/* See CREATE THREAD NOTES in nptl/pthread_create.c. */
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lll_lock (pd->lock, LLL_PRIVATE);
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/* If the thread should have higher priority because of some
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PTHREAD_PRIO_PROTECT mutexes it holds, adjust the priority. */
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if (__builtin_expect (pd->tpp != NULL, 0) && pd->tpp->priomax > prio)
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param.sched_priority = pd->tpp->priomax;
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/* Try to set the scheduler information. */
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if (__glibc_unlikely (sched_setparam (pd->tid, ¶m) == -1))
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result = errno;
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else
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{
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/* We succeeded changing the kernel information. Reflect this
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change in the thread descriptor. */
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param.sched_priority = prio;
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memcpy (&pd->schedparam, ¶m, sizeof (struct sched_param));
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pd->flags |= ATTR_FLAG_SCHED_SET;
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}
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lll_unlock (pd->lock, LLL_PRIVATE);
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return result;
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}
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