cap_alloc

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// -*- Mode: C++ -*-
// vim:ft=cpp
/*
 * (c) 2008-2009 Adam Lackorzynski <adam@os.inf.tu-dresden.de>,
 *               Alexander Warg <warg@os.inf.tu-dresden.de>
 *     economic rights: Technische Universität Dresden (Germany)
 *
 * This file is part of TUD:OS and distributed under the terms of the
 * GNU General Public License 2.
 * Please see the COPYING-GPL-2 file for details.
 *
 * As a special exception, you may use this file as part of a free software
 * library without restriction.  Specifically, if other files instantiate
 * templates or use macros or inline functions from this file, or you compile
 * this file and link it with other files to produce an executable, this
 * file does not by itself cause the resulting executable to be covered by
 * the GNU General Public License.  This exception does not however
 * invalidate any other reasons why the executable file might be covered by
 * the GNU General Public License.
 */
 
#pragma once
 
#include <l4/re/util/cap_alloc_impl.h>
#include <l4/sys/smart_capability>
#include <l4/sys/task>
#include <l4/re/consts>
 
namespace L4Re { namespace Util {
 
extern _Cap_alloc &cap_alloc;
 
template< unsigned long Unmap_flags = L4_FP_ALL_SPACES >
class Smart_cap_auto
{
public:
  static void free(L4::Cap_base &c)
  {
    if (c.is_valid())
      {
        cap_alloc.free(L4::Cap<void>(c.cap()), This_task, Unmap_flags);
        c.invalidate();
      }
  }
 
  static void invalidate(L4::Cap_base &c)
  {
    if (c.is_valid())
      c.invalidate();
  }
 
  static L4::Cap_base copy(L4::Cap_base const &src)
  {
    L4::Cap_base r = src;
    invalidate(const_cast<L4::Cap_base &>(src));
    return r;
  }
};
 
 
template< unsigned long Unmap_flags = L4_FP_ALL_SPACES >
class Smart_count_cap
{
public:
  static void free(L4::Cap_base &c) noexcept
  {
    if (c.is_valid())
      {
        if (cap_alloc.release(L4::Cap<void>(c.cap()), This_task, Unmap_flags))
    c.invalidate();
      }
  }
 
  static void invalidate(L4::Cap_base &c) noexcept
  {
    if (c.is_valid())
      c.invalidate();
  }
 
  static L4::Cap_base copy(L4::Cap_base const &src)
  {
    cap_alloc.take(L4::Cap<void>(src.cap()));
    return src;
  }
};
 
 
template< typename T >
struct Ref_cap
{
  typedef L4::Smart_cap<T, Smart_count_cap<L4_FP_ALL_SPACES> > Cap;
};
 
template< typename T >
struct Ref_del_cap
{
  typedef L4::Smart_cap<T, Smart_count_cap<L4_FP_DELETE_OBJ> > Cap;
};
 
template< typename T >
typename Ref_cap<T>::Cap
make_ref_cap() { return typename Ref_cap<T>::Cap(cap_alloc.alloc<T>()); }
 
template< typename T >
typename Ref_del_cap<T>::Cap
make_ref_del_cap()
{ return typename Ref_del_cap<T>::Cap(cap_alloc.alloc<T>()); }
 
}}