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/*
Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic 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 of the License, or
(at your option) any later version.
DCP-o-matic 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 DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef DCPOMATIC_EXCEPTION_STORE_H
#define DCPOMATIC_EXCEPTION_STORE_H
#include <boost/exception/all.hpp>
#include <boost/thread/mutex.hpp>
/** @class ExceptionStore
* @brief A parent class for classes which have a need to catch and
* re-throw exceptions.
*
* This is intended for classes which run their own thread; they should do
* something like
*
* void my_thread ()
* try {
* // do things which might throw exceptions
* } catch (...) {
* store_current ();
* }
*
* and then in another thread call rethrow(). If any
* exception was thrown by my_thread it will be stored by
* store_current() and then rethrow() will re-throw it where
* it can be handled.
*/
class ExceptionStore
{
public:
void rethrow () {
boost::mutex::scoped_lock lm (_exception_mutex);
if (_exception) {
boost::exception_ptr tmp = _exception;
_exception = boost::exception_ptr ();
boost::rethrow_exception (tmp);
}
}
protected:
void store_current () {
boost::mutex::scoped_lock lm (_exception_mutex);
_exception = boost::current_exception ();
}
private:
boost::exception_ptr _exception;
mutable boost::mutex _exception_mutex;
};
#endif
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