genode/base-fiasco/include/base/cancelable_lock.h
2013-02-14 13:23:36 +01:00

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C++

/*
* \brief Basic locking primitive
* \author Norman Feske
* \date 2006-07-26
*/
/*
* Copyright (C) 2006-2013 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__BASE__CANCELABLE_LOCK_H_
#define _INCLUDE__BASE__CANCELABLE_LOCK_H_
#include <base/lock_guard.h>
#include <base/native_types.h>
#include <base/blocking.h>
namespace Genode {
class Cancelable_lock
{
private:
int volatile _lock;
public:
enum State { LOCKED, UNLOCKED };
/**
* Constructor
*/
Cancelable_lock(State initial = UNLOCKED);
/**
* Try to aquire lock an block while lock is not free
*
* This function may throw a Genode::Blocking_canceled exception.
*/
void lock();
/**
* Release lock
*/
void unlock();
/**
* Lock guard
*/
typedef Genode::Lock_guard<Cancelable_lock> Guard;
};
}
#endif /* _INCLUDE__BASE__CANCELABLE_LOCK_H_ */