genode/repos/os/include/file_system/node.h

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/*
* \brief File-system node
* \author Norman Feske
* \date 2012-04-11
*/
#ifndef _FILE_SYSTEM__NODE_H_
#define _FILE_SYSTEM__NODE_H_
/* Genode includes */
#include <file_system/listener.h>
#include <util/list.h>
#include <base/lock.h>
namespace File_system {
class Node_base
{
private:
Genode::Lock _lock;
Genode::List<Listener> _listeners;
public:
virtual ~Node_base()
{
/* propagate event to listeners */
mark_as_updated();
notify_listeners();
while (_listeners.first())
_listeners.remove(_listeners.first());
}
void lock() { _lock.lock(); }
void unlock() { _lock.unlock(); }
void add_listener(Listener *listener)
{
_listeners.insert(listener);
}
void remove_listener(Listener *listener)
{
_listeners.remove(listener);
}
void notify_listeners()
{
for (Listener *curr = _listeners.first(); curr; curr = curr->next())
curr->notify();
}
void mark_as_updated()
{
for (Listener *curr = _listeners.first(); curr; curr = curr->next())
curr->mark_as_updated();
}
};
/**
* Guard used for properly releasing node locks
*/
struct Node_lock_guard
{
Node_base *node;
Node_lock_guard(Node_base *node) : node(node) { node = node; }
~Node_lock_guard() { node->unlock(); }
};
}
#endif /* _FILE_SYSTEM__NODE_H_ */