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//
// Copyright 2011,2014 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_task.hpp>
#include <uhd/utils/log.hpp>
#include <uhd/exception.hpp>
#include <boost/thread/thread.hpp>
#include <boost/thread/barrier.hpp>
#include <exception>
#include <iostream>
#include <vector>
#include <thread>
#include <atomic>
using namespace uhd;
class task_impl : public task{
public:
task_impl(const task_fcn_type &task_fcn):
_exit(false)
{
_task = std::thread([this, task_fcn](){ this->task_loop(task_fcn); });
}
~task_impl(void){
_exit = true;
if (_task.joinable()) {
_task.join();
}
}
private:
void task_loop(const task_fcn_type &task_fcn){
try{
while (!_exit){
task_fcn();
}
}
catch(const std::exception &e){
do_error_msg(e.what());
}
catch(...){
UHD_THROW_INVALID_CODE_PATH();
}
}
void do_error_msg(const std::string &msg){
UHD_LOGGER_ERROR("UHD")
<< "An unexpected exception was caught in a task loop."
<< "The task loop will now exit, things may not work."
<< msg
;
}
std::atomic<bool> _exit;
std::thread _task;
};
task::sptr task::make(const task_fcn_type &task_fcn){
return task::sptr(new task_impl(task_fcn));
}
msg_task::~msg_task(void){
/* NOP */
}
/*
* During shutdown pointers to queues for radio_ctrl_core might not be available anymore.
* msg_task_impl provides a dump_queue for such messages.
* ctrl_cores can check this queue for stranded messages.
*/
class msg_task_impl : public msg_task{
public:
msg_task_impl(const task_fcn_type &task_fcn):
_spawn_barrier(2)
{
(void)_thread_group.create_thread(boost::bind(&msg_task_impl::task_loop, this, task_fcn));
_spawn_barrier.wait();
}
~msg_task_impl(void){
_running = false;
_thread_group.interrupt_all();
_thread_group.join_all();
}
/*
* Returns the first message for the given SID.
* This way a radio_ctrl_core doesn't have to die in timeout but can check for stranded messages here.
* This might happen during shutdown when dtors are called.
* See also: comments in b200_io_impl->handle_async_task
*/
msg_payload_t get_msg_from_dump_queue(uint32_t sid)
{
boost::mutex::scoped_lock lock(_mutex);
msg_payload_t b;
for (size_t i = 0; i < _dump_queue.size(); i++) {
if (sid == _dump_queue[i].first) {
b = _dump_queue[i].second;
_dump_queue.erase(_dump_queue.begin() + i);
break;
}
}
return b;
}
private:
void task_loop(const task_fcn_type &task_fcn){
_running = true;
_spawn_barrier.wait();
try{
while (_running){
boost::optional<msg_type_t> buff = task_fcn();
if(buff != boost::none){
/*
* If a message gets stranded it is returned by task_fcn and then pushed to the dump_queue.
* This way ctrl_cores can check dump_queue for missing messages.
*/
boost::mutex::scoped_lock lock(_mutex);
_dump_queue.push_back(buff.get() );
}
}
}
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_LOGGER_ERROR("UHD")
<< "An unexpected exception was caught in a task loop."
<< "The task loop will now exit, things may not work."
<< msg
;
}
boost::mutex _mutex;
boost::thread_group _thread_group;
boost::barrier _spawn_barrier;
bool _running;
/*
* This queue holds stranded messages until a radio_ctrl_core grabs them via 'get_msg_from_dump_queue'.
*/
std::vector <msg_type_t> _dump_queue;
};
msg_task::sptr msg_task::make(const task_fcn_type &task_fcn){
return msg_task::sptr(new msg_task_impl(task_fcn));
}
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