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//
// Copyright 2011 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/>.
//
#include <uhd/utils/tasks.hpp>
#include <uhd/utils/msg.hpp>
#include <boost/thread/thread.hpp>
#include <boost/thread/barrier.hpp>
#include <exception>
#include <iostream>
using namespace uhd;
class task_impl : public task{
public:
task_impl(const task_fcn_type &task_fcn):
_spawn_barrier(2)
{
_thread_group.create_thread(boost::bind(&task_impl::task_loop, this, task_fcn));
_spawn_barrier.wait();
}
~task_impl(void){
_running = false;
_thread_group.interrupt_all();
_thread_group.join_all();
}
private:
void task_loop(const task_fcn_type &task_fcn){
_running = true;
_spawn_barrier.wait();
try{
while (_running){
task_fcn();
}
}
catch(const boost::thread_interrupted &){
//this is an ok way to exit the task loop
}
catch(const std::exception &e){
do_error_msg(e.what());
}
catch(...){
//FIXME
//Unfortunately, this is also an ok way to end a task,
//because on some systems boost throws uncatchables.
}
}
void do_error_msg(const std::string &msg){
UHD_MSG(error)
<< "An unexpected exception was caught in a task loop." << std::endl
<< "The task loop will now exit, things may not work." << std::endl
<< msg << std::endl
;
}
boost::thread_group _thread_group;
boost::barrier _spawn_barrier;
bool _running;
};
task::sptr task::make(const task_fcn_type &task_fcn){
return task::sptr(new task_impl(task_fcn));
}
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