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/* Copyright (C) 2020 Free Software Foundation, Inc.
This file is part of the GNU Atomic Library (libatomic).
Libatomic 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 of the License, or
(at your option) any later version.
Libatomic 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/>. */
/* Functions libat_lock_n/libat_unlock_n based on GOMP_atomic_start/end in
libgomp/atomic.c. */
#include "libatomic_i.h"
static int atomic_lock;
void
libat_lock_n (void *ptr __attribute__((unused)),
size_t n __attribute__((unused)))
{
while (__sync_lock_test_and_set (&atomic_lock, 1))
; /* Spin. */
}
void
libat_unlock_n (void *ptr __attribute__((unused)),
size_t n __attribute__((unused)))
{
__sync_lock_release (&atomic_lock);
}
void
libat_lock_1 (void *ptr)
{
libat_lock_n (ptr, 1);
}
void
libat_unlock_1 (void *ptr)
{
libat_unlock_n (ptr, 1);
}
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