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/*
Copyright (C) 2025 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_SIGNAL_H
#define DCPOMATIC_SIGNAL_H
#include "cross.h"
#include <boost/thread.hpp>
#include <iostream>
class SignalBase
{
public:
virtual ~SignalBase() = default;
virtual void disconnect(int id) = 0;
};
/** @class Connection
* @brief Record of a connection to a signal, so it can be disconnected.
*/
class Connection
{
public:
Connection(SignalBase& signal, int id)
: _signal(signal)
, _id(id)
{}
Connection& operator=(Connection const& other)
{
_signal = other._signal;
_id = other._id;
return *this;
}
void disconnect()
{
_signal.disconnect(_id);
}
private:
SignalBase& _signal;
int _id;
};
/** @class ScopedConnection
* @brief Connection that disconnects itself on destruction.
*/
class ScopedConnection
{
public:
ScopedConnection() {}
ScopedConnection(Connection connection)
: _connection(std::move(connection))
{}
ScopedConnection(ScopedConnection const& other) = delete;
ScopedConnection(ScopedConnection&& other)
: _connection(std::move(other._connection))
{}
ScopedConnection& operator=(ScopedConnection const& other) = delete;
ScopedConnection& operator=(ScopedConnection&& other)
{
if (this != &other) {
_connection = other._connection;
other._connection.reset();
}
return *this;
}
~ScopedConnection()
{
if (_connection) {
_connection->disconnect();
}
}
private:
boost::optional<Connection> _connection;
};
namespace pending {
extern boost::mutex mutex;
extern std::map<boost::thread::id, std::list<std::function<void ()>>> callbacks;
extern void process();
};
class ThreadWaker
{
public:
virtual void wake() {}
};
extern ThreadWaker* thread_waker;
template <typename Parameters>
class Signal : public SignalBase
{
private:
struct Callback
{
int id;
boost::thread::id thread;
/* XXX */
std::string thread_name;
std::function<Parameters> function;
};
public:
Connection connect(std::function<Parameters> callback)
{
boost::mutex::scoped_lock lm(_mutex);
auto const id = _id++;
auto const thread_id = boost::this_thread::get_id();
_callbacks.push_back(Callback{id, thread_id, thread_name(), callback});
return Connection(*this, id);
}
void disconnect(int id) override
{
boost::mutex::scoped_lock lm(_mutex);
auto iter = std::find_if(_callbacks.begin(), _callbacks.end(), [id](Callback const& callback) { return callback.id == id; });
if (iter != _callbacks.end()) {
_callbacks.erase(iter);
}
}
template <typename... Args>
void operator()(Args...args)
{
emit(args...);
}
template <typename... Args>
void emit(Args... args)
{
boost::mutex::scoped_lock lm(_mutex);
auto thread_id = boost::this_thread::get_id();
std::cout << "emit with " << _callbacks.size() << "\n";
for (auto const& callback: _callbacks) {
if (thread_id == callback.thread) {
std::cout << "simple emit.\n";
callback.function(args...);
} else {
std::cout << "x-thread emit from " << thread_name() << " to " << callback.thread_name << "\n";
boost::mutex::scoped_lock lm2(pending::mutex);
pending::callbacks[callback.thread].push_back(boost::bind(callback.function, args...));
if (thread_waker) {
std::cout << "x-thread emit wakes shit.\n";
thread_waker->wake();
}
}
}
}
private:
boost::mutex _mutex;
int _id = 0;
std::list<Callback> _callbacks;
};
#endif
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