/usr/include/glusterfs/locking.h is in glusterfs-common 3.5.2-2+deb8u3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#ifndef _LOCKING_H
#define _LOCKING_H
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include <pthread.h>
#if HAVE_SPINLOCK
#define LOCK_INIT(x) pthread_spin_init (x, 0)
#define LOCK(x) pthread_spin_lock (x)
#define TRY_LOCK(x) pthread_spin_trylock (x)
#define UNLOCK(x) pthread_spin_unlock (x)
#define LOCK_DESTROY(x) pthread_spin_destroy (x)
typedef pthread_spinlock_t gf_lock_t;
#else
#define LOCK_INIT(x) pthread_mutex_init (x, 0)
#define LOCK(x) pthread_mutex_lock (x)
#define TRY_LOCK(x) pthread_mutex_trylock (x)
#define UNLOCK(x) pthread_mutex_unlock (x)
#define LOCK_DESTROY(x) pthread_mutex_destroy (x)
typedef pthread_mutex_t gf_lock_t;
#endif /* HAVE_SPINLOCK */
#endif /* _LOCKING_H */
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