/* glock.c: Routines for locking critical sections
Copyright (c) 2016 BogDan Vatra
This program 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 2 of the License, or
(at your option) any later version.
This program 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.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Author contact information:
BogDan Vatra <bogdan@kde.org>
*/
#include "config.h"
#include <stdatomic.h>
#include "internals.h"
void
atomic_lock( atomic_char *lock_ptr )
{
char locked = ATOMIC_VAR_INIT( 1 );
char unlocked;
do {
unlocked = ATOMIC_VAR_INIT( 0 );
} while( !atomic_compare_exchange_strong( lock_ptr, &unlocked, locked ) );
}
void
atomic_unlock( atomic_char *lock_ptr )
{
char locked;
char unlocked = ATOMIC_VAR_INIT( 0 );
do {
locked = ATOMIC_VAR_INIT( 1 );
} while( !atomic_compare_exchange_strong( lock_ptr, &locked, unlocked ) );
}
