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/* Copyright (C) 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David Bartley <dtbartle@csclub.uwaterloo.ca>, 2008.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <inline-syscall.h>
#include <pthreadP.h>
#include <synch.h>
#include <errno.h>
DECLARE_INLINE_SYSCALL (int, lwp_mutex_register, mutex_t *lp);
int mutex_init (mutex, type, arg)
mutex_t *mutex;
int type;
void * arg;
{
// TODO: check type
/* USYNC_PROCESS_ROBUST must be mapped to LOCK_SHARED | LOCK_ROBUST. */
if (type & USYNC_PROCESS_ROBUST)
type = (type & ~USYNC_PROCESS_ROBUST) | LOCK_SHARED | LOCK_ROBUST;
if (type & LOCK_ROBUST)
{
if ((mutex->mutex_type & LOCK_INITED))
return EBUSY;
}
else
{
memset (mutex, 0, sizeof(mutex_t));
}
mutex->mutex_type = type;
mutex->mutex_flag = LOCK_INITED;
mutex->mutex_magic = MUTEX_MAGIC;
mutex->mutex_ceiling = (int)arg;
mutex->mutex_cond_waiters = 0;
/* Register robust shared lock. */
if ((type & (LOCK_ROBUST | LOCK_SHARED)) == (LOCK_ROBUST | LOCK_SHARED))
{
int errval = INLINE_SYSCALL (lwp_mutex_register, 1, mutex);
if (errval != 0)
return errval;
}
return 0;
}
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