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