mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-27 17:18:53 +00:00
131 lines
2.6 KiB
C++
131 lines
2.6 KiB
C++
/*
|
|
* \brief Object pool - map ids to objects
|
|
* \author Norman Feske
|
|
* \date 2006-06-26
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2006-2012 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__BASE__OBJECT_POOL_H_
|
|
#define _INCLUDE__BASE__OBJECT_POOL_H_
|
|
|
|
#include <util/avl_tree.h>
|
|
#include <base/capability.h>
|
|
#include <base/lock.h>
|
|
|
|
namespace Genode {
|
|
|
|
/**
|
|
* Map object ids to local objects
|
|
*
|
|
* \param OBJ_TYPE object type (must be inherited from Object_pool::Entry)
|
|
*
|
|
* The local names of a capabilities are used to differentiate multiple server
|
|
* objects managed by one and the same object pool.
|
|
*/
|
|
template <typename OBJ_TYPE>
|
|
class Object_pool
|
|
{
|
|
public:
|
|
|
|
class Entry : public Avl_node<Entry>
|
|
{
|
|
private:
|
|
|
|
Untyped_capability _cap;
|
|
|
|
inline long _obj_id() { return _cap.local_name(); }
|
|
|
|
friend class Object_pool;
|
|
friend class Avl_tree<Entry>;
|
|
|
|
public:
|
|
|
|
enum { OBJ_ID_INVALID = 0 };
|
|
|
|
/**
|
|
* Constructors
|
|
*/
|
|
Entry() { }
|
|
Entry(Untyped_capability cap) : _cap(cap) { }
|
|
|
|
/**
|
|
* Avl_node interface
|
|
*/
|
|
bool higher(Entry *e) { return e->_obj_id() > _obj_id(); }
|
|
void recompute() { } /* for gcc-3.4 compatibility */
|
|
|
|
/**
|
|
* Support for object pool
|
|
*/
|
|
Entry *find_by_obj_id(long obj_id)
|
|
{
|
|
if (obj_id == _obj_id()) return this;
|
|
|
|
Entry *obj = this->child(obj_id > _obj_id());
|
|
|
|
return obj ? obj->find_by_obj_id(obj_id) : 0;
|
|
}
|
|
|
|
/**
|
|
* Assign capability to object pool entry
|
|
*/
|
|
void cap(Untyped_capability c) { _cap = c; }
|
|
|
|
Untyped_capability const cap() const { return _cap; }
|
|
};
|
|
|
|
private:
|
|
|
|
Avl_tree<Entry> _tree;
|
|
Lock _lock;
|
|
|
|
public:
|
|
|
|
void insert(OBJ_TYPE *obj)
|
|
{
|
|
Lock::Guard lock_guard(_lock);
|
|
_tree.insert(obj);
|
|
}
|
|
|
|
void remove(OBJ_TYPE *obj)
|
|
{
|
|
Lock::Guard lock_guard(_lock);
|
|
_tree.remove(obj);
|
|
}
|
|
|
|
/**
|
|
* Lookup object
|
|
*/
|
|
OBJ_TYPE *obj_by_id(long obj_id)
|
|
{
|
|
Lock::Guard lock_guard(_lock);
|
|
Entry *obj = _tree.first();
|
|
return (OBJ_TYPE *)(obj ? obj->find_by_obj_id(obj_id) : 0);
|
|
}
|
|
|
|
OBJ_TYPE *obj_by_cap(Untyped_capability cap)
|
|
{
|
|
return obj_by_id(cap.local_name());
|
|
}
|
|
|
|
/**
|
|
* Return first element of tree
|
|
*
|
|
* This function is used for removing tree elements step by step.
|
|
*/
|
|
OBJ_TYPE *first()
|
|
{
|
|
Lock::Guard lock_guard(_lock);
|
|
return (OBJ_TYPE *)_tree.first();
|
|
}
|
|
};
|
|
}
|
|
|
|
#endif /* _INCLUDE__BASE__OBJECT_POOL_H_ */
|