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48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
/* glock.c: Routines for locking critical sections
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Copyright (c) 2016 BogDan Vatra
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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Author contact information:
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BogDan Vatra <bogdan@kde.org>
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*/
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#include "config.h"
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#include <stdatomic.h>
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#include "internals.h"
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void
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atomic_lock( atomic_char *lock_ptr )
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{
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char locked = ATOMIC_VAR_INIT( 1 );
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char unlocked;
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do {
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unlocked = ATOMIC_VAR_INIT( 0 );
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} while( !atomic_compare_exchange_strong( lock_ptr, &unlocked, locked ) );
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}
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void
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atomic_unlock( atomic_char *lock_ptr )
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{
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char locked;
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char unlocked = ATOMIC_VAR_INIT( 0 );
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do {
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locked = ATOMIC_VAR_INIT( 1 );
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} while( !atomic_compare_exchange_strong( lock_ptr, &locked, unlocked ) );
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}
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