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//
// Copyright 2012 Ettus Research LLC
//
// This program 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 3 of the License, or
// (at your option) any later version.
//
// This program 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, see <http://www.gnu.org/licenses/>.
//
#ifndef INCLUDED_LIBUHD_TRANSPORT_SIMPLE_CLAIMER_HPP
#define INCLUDED_LIBUHD_TRANSPORT_SIMPLE_CLAIMER_HPP
#include <uhd/config.hpp>
#include <boost/thread/condition.hpp>
#include <boost/thread/mutex.hpp>
namespace uhd{ namespace transport{
/***********************************************************************
* Claimer class to provide synchronization for multi-thread access.
* Claiming enables buffer classes to be used with a buffer queue.
**********************************************************************/
class simple_claimer{
public:
simple_claimer(void){
this->release();
}
UHD_INLINE void release(void){
boost::mutex::scoped_lock lock(_mutex);
_locked = false;
lock.unlock();
_cond.notify_one();
}
UHD_INLINE bool claim_with_wait(const double timeout){
boost::mutex::scoped_lock lock(_mutex);
while (_locked){
if (not _cond.timed_wait(lock, boost::posix_time::microseconds(long(timeout*1e6)))){
break;
}
}
const bool ret = not _locked;
_locked = true;
return ret;
}
private:
bool _locked;
boost::mutex _mutex;
boost::condition_variable _cond;
};
}} //namespace uhd::transport
#endif /* INCLUDED_LIBUHD_TRANSPORT_SIMPLE_CLAIMER_HPP */
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