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/* Copyright (C) 2005-2020 Free Software Foundation, Inc.
Contributed by Richard Henderson <rth@redhat.com>.
This file is part of the GNU Offloading and Multi Processing Library
(libgomp).
Libgomp is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
Libgomp 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 General Public License for
more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* This is a generic implementation of the public OpenMP locking primitives in
terms of internal gomp_mutex_t. It is not meant to be compiled on its own.
It is #include'd from config/{linux,nvptx}/lock.c. */
#include <string.h>
#include "libgomp.h"
/* The internal gomp_mutex_t and the external non-recursive omp_lock_t
have the same form. Re-use it. */
void
gomp_init_lock_30 (omp_lock_t *lock)
{
gomp_mutex_init (lock);
}
void
gomp_destroy_lock_30 (omp_lock_t *lock)
{
gomp_mutex_destroy (lock);
}
void
gomp_set_lock_30 (omp_lock_t *lock)
{
gomp_mutex_lock (lock);
}
void
gomp_unset_lock_30 (omp_lock_t *lock)
{
gomp_mutex_unlock (lock);
}
int
gomp_test_lock_30 (omp_lock_t *lock)
{
int oldval = 0;
return __atomic_compare_exchange_n (lock, &oldval, 1, false,
MEMMODEL_ACQUIRE, MEMMODEL_RELAXED);
}
void
gomp_init_nest_lock_30 (omp_nest_lock_t *lock)
{
memset (lock, '\0', sizeof (*lock));
}
void
gomp_destroy_nest_lock_30 (omp_nest_lock_t *lock)
{
}
void
gomp_set_nest_lock_30 (omp_nest_lock_t *lock)
{
void *me = gomp_icv (true);
if (lock->owner != me)
{
gomp_mutex_lock (&lock->lock);
lock->owner = me;
}
lock->count++;
}
void
gomp_unset_nest_lock_30 (omp_nest_lock_t *lock)
{
if (--lock->count == 0)
{
lock->owner = NULL;
gomp_mutex_unlock (&lock->lock);
}
}
int
gomp_test_nest_lock_30 (omp_nest_lock_t *lock)
{
void *me = gomp_icv (true);
int oldval;
if (lock->owner == me)
return ++lock->count;
oldval = 0;
if (__atomic_compare_exchange_n (&lock->lock, &oldval, 1, false,
MEMMODEL_ACQUIRE, MEMMODEL_RELAXED))
{
lock->owner = me;
lock->count = 1;
return 1;
}
return 0;
}
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