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49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/* Get priority ceiling setting from pthread_mutexattr_t.
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Copyright (C) 2006-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.com>, 2006.
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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 <pthreadP.h>
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#include <atomic.h>
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int
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pthread_mutexattr_getprioceiling (const pthread_mutexattr_t *attr,
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int *prioceiling)
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{
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const struct pthread_mutexattr *iattr;
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int ceiling;
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iattr = (const struct pthread_mutexattr *) attr;
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ceiling = ((iattr->mutexkind & PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
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>> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT);
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if (! ceiling)
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{
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/* See __init_sched_fifo_prio. */
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if (atomic_load_relaxed (&__sched_fifo_min_prio) == -1)
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__init_sched_fifo_prio ();
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if (ceiling < atomic_load_relaxed (&__sched_fifo_min_prio))
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ceiling = atomic_load_relaxed (&__sched_fifo_min_prio);
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}
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*prioceiling = ceiling;
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return 0;
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}
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