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/* -*- c++ -*- */
/*
* Copyright 2007 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef INCLUDED_MB_RUNTIME_PLACEHOLDER_H
#define INCLUDED_MB_RUNTIME_PLACEHOLDER_H
#include <mb_runtime.h>
/*!
* \brief Concrete runtime that serves as a placeholder until the real
* runtime is known.
*
* The singleton instance of this class is installed in the d_runtime
* instance variable of each mb_mblock_impl at construction time.
* Having a valid instance of runtime removes the "pre runtime::run"
* corner case, and allows us to lock and unlock the big runtime lock
* even though there's no "real runtime" yet.
*/
class mb_runtime_placeholder : public mb_runtime
{
public:
mb_runtime_placeholder();
~mb_runtime_placeholder();
//! throws mbe_not_implemented
bool run(mb_mblock_sptr top);
//! Return the placeholder singleton
static mb_runtime *singleton();
};
#endif /* INCLUDED_MB_RUNTIME_PLACEHOLDER_H */
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