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56 lines
2.0 KiB
C
56 lines
2.0 KiB
C
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/* Set current priority ceiling of pthread_mutex_t.
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Copyright (C) 2006 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <pthreadP.h>
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int
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pthread_mutex_setprioceiling (mutex, prioceiling, old_ceiling)
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pthread_mutex_t *mutex;
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int prioceiling;
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int *old_ceiling;
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{
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/* The low bits of __kind aren't ever changed after pthread_mutex_init,
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so we don't need a lock yet. */
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if ((mutex->__data.__kind & PTHREAD_MUTEX_PRIO_PROTECT_PRIVATE_NP) == 0)
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return EINVAL;
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if (prioceiling < 0 || __builtin_expect (prioceiling > 255, 0))
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return EINVAL;
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/* XXX This needs to lock with TID, but shouldn't obey priority protect
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protocol. */
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/* lll_xxx_mutex_lock (mutex->__data.__lock); */
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if (old_ceiling != NULL)
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*old_ceiling = (mutex->__data.__kind & PTHREAD_MUTEX_PRIO_CEILING_MASK)
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>> PTHREAD_MUTEX_PRIO_CEILING_SHIFT;
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int newkind = (mutex->__data.__kind & ~PTHREAD_MUTEX_PRIO_CEILING_MASK);
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mutex->__data.__kind = newkind
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| (prioceiling << PTHREAD_MUTEX_PRIO_CEILING_SHIFT);
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/* XXX This needs to unlock the above special kind of lock. */
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/* lll_xxx_mutex_unlock (mutex->__data.__lock); */
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return 0;
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}
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