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95 lines
3.4 KiB
C
95 lines
3.4 KiB
C
/* Copyright (C) 2002, 2003, 2004, 2005, 2006 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, 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 <assert.h>
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#include <errno.h>
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#include <string.h>
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#include "pthreadP.h"
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static const struct pthread_mutexattr default_attr =
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{
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/* Default is a normal mutex, not shared between processes. */
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.mutexkind = PTHREAD_MUTEX_NORMAL
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};
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int
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__pthread_mutex_init (mutex, mutexattr)
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pthread_mutex_t *mutex;
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const pthread_mutexattr_t *mutexattr;
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{
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const struct pthread_mutexattr *imutexattr;
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assert (sizeof (pthread_mutex_t) <= __SIZEOF_PTHREAD_MUTEX_T);
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imutexattr = (const struct pthread_mutexattr *) mutexattr ?: &default_attr;
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/* Sanity checks. */
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// XXX For now we cannot implement robust mutexes if they are shared.
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if ((imutexattr->mutexkind & PTHREAD_MUTEXATTR_FLAG_ROBUST) != 0
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&& (imutexattr->mutexkind & PTHREAD_MUTEXATTR_FLAG_PSHARED) != 0)
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return ENOTSUP;
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// XXX For now we don't support priority inherited or priority protected
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// XXX mutexes.
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if ((imutexattr->mutexkind & PTHREAD_MUTEXATTR_PROTOCOL_MASK)
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!= (PTHREAD_PRIO_NONE << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT))
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return ENOTSUP;
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/* Clear the whole variable. */
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memset (mutex, '\0', __SIZEOF_PTHREAD_MUTEX_T);
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/* Copy the values from the attribute. */
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mutex->__data.__kind = imutexattr->mutexkind & ~PTHREAD_MUTEXATTR_FLAG_BITS;
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if ((imutexattr->mutexkind & PTHREAD_MUTEXATTR_FLAG_ROBUST) != 0)
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mutex->__data.__kind |= PTHREAD_MUTEX_ROBUST_PRIVATE_NP;
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switch ((imutexattr->mutexkind & PTHREAD_MUTEXATTR_PROTOCOL_MASK)
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>> PTHREAD_MUTEXATTR_PROTOCOL_SHIFT)
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{
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case PTHREAD_PRIO_INHERIT:
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mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_INHERIT_PRIVATE_NP;
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break;
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case PTHREAD_PRIO_PROTECT:
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mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_PROTECT_PRIVATE_NP;
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if (PTHREAD_MUTEX_PRIO_CEILING_MASK
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== PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
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mutex->__data.__kind |= (imutexattr->mutexkind
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& PTHREAD_MUTEXATTR_PRIO_CEILING_MASK);
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else
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mutex->__data.__kind |= ((imutexattr->mutexkind
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& PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
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>> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT)
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<< PTHREAD_MUTEX_PRIO_CEILING_SHIFT;
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break;
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default:
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break;
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}
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/* Default values: mutex not used yet. */
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// mutex->__count = 0; already done by memset
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// mutex->__owner = 0; already done by memset
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// mutex->__nusers = 0; already done by memset
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// mutex->__spins = 0; already done by memset
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// mutex->__next = NULL; already done by memset
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return 0;
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}
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strong_alias (__pthread_mutex_init, pthread_mutex_init)
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INTDEF(__pthread_mutex_init)
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