genode/os/include/dde_kit/spin_lock.h

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/*
* \brief Spin lock
* \author Norman Feske
* \date 2012-01-27
*/
/*
* Copyright (C) 2012 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__DDE_KIT__SPIN_LOCK_H_
#define _INCLUDE__DDE_KIT__SPIN_LOCK_H_
/**
* Private spin lock type
*/
typedef volatile int dde_kit_spin_lock;
enum { DDE_KIT_SPIN_LOCK_LOCKED, DDE_KIT_SPIN_LOCK_UNLOCKED };
/**
* Initialize spin lock
*
* \param out_lock lock handle (output parameter)
*
* The created lock is free (not acquired) after initialization.
*/
void dde_kit_spin_lock_init(dde_kit_spin_lock *spin_lock);
/**
* Acquire spin lock
*/
void dde_kit_spin_lock_lock(dde_kit_spin_lock *spin_lock);
/**
* Try to acquire a lock (non-blocking)
*/
int dde_kit_spin_lock_try_lock(dde_kit_spin_lock *spin_lock);
/**
* Release spin lock
*/
void dde_kit_spin_lock_unlock(dde_kit_spin_lock *spin_lock);
#endif /* _INCLUDE__DDE_KIT__SPIN_LOCK_H_ */