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/* C11 threads mutex initialization implementation.
Copyright (C) 2018-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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, see
<https://www.gnu.org/licenses/>. */
#include <stdalign.h>
#include "thrd_priv.h"
int
mtx_init (mtx_t *mutex, int type)
{
_Static_assert (sizeof (mtx_t) == sizeof (pthread_mutex_t),
"sizeof (mtx_t) != sizeof (pthread_mutex_t)");
_Static_assert (alignof (mtx_t) == alignof (pthread_mutex_t),
"alignof (mtx_t) != alignof (pthread_mutex_t)");
pthread_mutexattr_t attr;
__pthread_mutexattr_init (&attr);
/* Another possible solution would be to set the flags directly in
mutex object. */
switch (type)
{
case mtx_plain | mtx_recursive:
case mtx_timed | mtx_recursive:
__pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);
break;
case mtx_plain:
case mtx_timed: /* No difference between both in standard */
default:
__pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_NORMAL);
break;
}
int err_code = __pthread_mutex_init ((pthread_mutex_t *) mutex, &attr);
/* pthread_mutexattr_destroy implementation is a noop. */
return thrd_err_map (err_code);
}
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