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// templated callback system
// Copyright (C) 2008, 2009 Tim Blechmann
//
// 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 2 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; see the file COPYING. If not, write to
// the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
#ifndef UTILITIES_CALLBACK_INTERPRETER_HPP
#define UTILITIES_CALLBACK_INTERPRETER_HPP
#include <thread>
#include "branch_hints.hpp"
#include "callback_system.hpp"
#include "nova-tt/semaphore.hpp"
#include "nova-tt/thread_priority.hpp"
#include <boost/atomic.hpp>
#include <boost/checked_delete.hpp>
namespace nova {
namespace detail {
struct nop_functor
{
void operator()() const {}
};
} /* namespace detail */
template <class callback_type,
bool mpmc = true,
class callback_deleter = boost::checked_deleter<callback_type> >
class callback_interpreter:
callback_system<callback_type, mpmc, callback_deleter>
{
typedef callback_system<callback_type, mpmc, callback_deleter> super_t;
public:
callback_interpreter(void):
sem(0), running(false)
{}
void add_callback(callback_type * cb)
{
super_t::add_callback(cb);
sem.post();
}
void run(void)
{
running.store(true, boost::memory_order_relaxed);
perform();
}
void terminate(void)
{
running.store(false, boost::memory_order_relaxed);
sem.post();
}
protected:
void run(semaphore & sync_sem)
{
running.store(true, boost::memory_order_relaxed);
sync_sem.post();
perform();
}
private:
void perform(void)
{
do
{
sem.wait();
super_t::run_callbacks();
} while(likely(running.load(boost::memory_order_relaxed)));
}
protected:
semaphore sem;
boost::atomic<bool> running;
};
template <class callback_type,
class init_functor = detail::nop_functor,
class callback_deleter = boost::checked_deleter<callback_type> >
class threaded_callback_interpreter:
public callback_interpreter<callback_type, true, callback_deleter>,
init_functor
{
typedef callback_interpreter<callback_type, true, callback_deleter> super;
std::thread callback_thread;
public:
threaded_callback_interpreter(void)
{}
~threaded_callback_interpreter(void)
{
if (super::running.load())
join_thread();
}
void start_thread(void)
{
semaphore sync_sem;
semaphore_sync<semaphore> sync(sync_sem);
std::thread thr( [&]() {
this->run_thread(sync_sem);
});
callback_thread = move(thr);
}
void run_thread(semaphore & sync_sem)
{
init_functor::operator()();
super::run(sync_sem);
}
void join_thread(void)
{
super::terminate();
callback_thread.join();
}
};
template <class callback_type,
class init_functor = detail::nop_functor,
class callback_deleter = boost::checked_deleter<callback_type> >
class callback_interpreter_threadpool:
public callback_interpreter<callback_type, true, callback_deleter>,
init_functor
{
typedef callback_interpreter<callback_type, true, callback_deleter> super;
public:
callback_interpreter_threadpool(uint16_t worker_thread_count, bool rt, uint16_t priority):
worker_thread_count_(worker_thread_count), priority(priority), rt(rt)
{
semaphore sync_sem;
using namespace std;
for (uint16_t i = 0; i != worker_thread_count; ++i)
threads.emplace_back( [&] () {
this->run(sync_sem);
});
for (uint16_t i = 0; i != worker_thread_count; ++i)
sync_sem.wait();
}
~callback_interpreter_threadpool(void)
{
if (super::running.load())
join_threads();
}
void join_threads(void)
{
super::running.store(false);
for (uint16_t i = 0; i != worker_thread_count_; ++i)
super::sem.post();
for (std::thread & thread : threads)
thread.join();
}
private:
void run(semaphore & sync_sem)
{
#ifdef NOVA_TT_PRIORITY_RT
if (rt)
thread_set_priority_rt(priority);
else
#endif
thread_set_priority(priority);
init_functor::operator()();
super::run(sync_sem);
}
std::vector<std::thread> threads;
uint16_t worker_thread_count_;
uint16_t priority;
bool rt;
};
} /* namespace nova */
#endif /* UTILITIES_CALLBACK_INTERPRETER_HPP */
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