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/*
* Glib::Dispatcher example -- cross thread signalling
* by Daniel Elstner <daniel.elstner@gmx.net>
*
* modified to only use glibmm
* by J. Abelardo Gutierrez <jabelardo@cantv.net>
*
* Copyright (c) 2002-2003 Free Software Foundation
*/
#include <sigc++/class_slot.h>
#include <glibmm.h>
#include <iostream>
#include <algorithm>
#include <functional>
#include <list>
namespace
{
Glib::RefPtr<Glib::MainLoop> main_loop;
class ThreadProgress : public sigc::trackable
{
public:
ThreadProgress(int id, Glib::Mutex& mtx);
virtual ~ThreadProgress();
void launch();
typedef sigc::signal<void, ThreadProgress*> type_signal_finished;
type_signal_finished& signal_finished();
int id() const;
private:
unsigned int progress_;
Glib::Dispatcher signal_increment_;
type_signal_finished signal_finished_;
int id_;
Glib::Mutex& cout_mutex_;
void progress_increment();
void thread_function();
};
//TODO: Rename to avoid confusion with Glib::Dispatcher.
class Dispatcher : public sigc::trackable
{
public:
Dispatcher();
virtual ~Dispatcher();
void launch_threads();
private:
std::list<ThreadProgress*> progress_list_;
Glib::Mutex cout_mutex_;
void on_progress_finished(ThreadProgress* progress);
};
ThreadProgress::ThreadProgress(int id, Glib::Mutex& mtx)
:
progress_ (0), id_ (id), cout_mutex_ (mtx)
{
// Connect to the cross-thread signal.
signal_increment_.connect(sigc::mem_fun(*this, &ThreadProgress::progress_increment));
}
ThreadProgress::~ThreadProgress()
{}
void ThreadProgress::launch()
{
// Create a non-joinable thread -- it's deleted automatically on thread exit.
Glib::Thread::create(sigc::mem_fun(*this, &ThreadProgress::thread_function), false);
}
ThreadProgress::type_signal_finished& ThreadProgress::signal_finished()
{
return signal_finished_;
}
int ThreadProgress::id() const
{
return id_;
}
void ThreadProgress::progress_increment()
{
// Use an integer because floating point arithmetic is inaccurate --
// we want to finish *exactly* after the 100th increment.
++progress_;
cout_mutex_.lock();
std::cout << "Thread " << id_ << ": " << progress_ << " %" << std::endl;
cout_mutex_.unlock();
if(progress_ >= 100)
signal_finished().emit(this);
}
void ThreadProgress::thread_function()
{
Glib::Rand rand;
int usecs = 5000;
for(int i = 0; i < 100; ++i)
{
usecs = rand.get_int_range(std::max(0, usecs - 1000 - i), std::min(20000, usecs + 1000 + i));
Glib::usleep(usecs);
// Tell the thread to increment the progress value.
signal_increment_.emit();
}
}
Dispatcher::Dispatcher()
:
cout_mutex_ ()
{
std::cout << "Thread Dispatcher Example." << std::endl;
for(int i = 0; i < 5; ++i)
{
ThreadProgress *const progress = new ThreadProgress(i, cout_mutex_);
progress_list_.push_back(progress);
progress->signal_finished().connect(
sigc::mem_fun(*this, &Dispatcher::on_progress_finished));
}
}
Dispatcher::~Dispatcher()
{}
void Dispatcher::launch_threads()
{
std::for_each(
progress_list_.begin(), progress_list_.end(),
std::mem_fun(&ThreadProgress::launch));
}
void Dispatcher::on_progress_finished(ThreadProgress* progress)
{
cout_mutex_.lock();
std::cout << "Thread " << progress->id() << ": finished." << std::endl;
cout_mutex_.unlock();
progress_list_.remove(progress);
if(progress_list_.empty())
main_loop->quit();
}
} // anonymous namespace
int main(int argc, char** argv)
{
Glib::thread_init();
main_loop = Glib::MainLoop::create();
Dispatcher dispatcher;
// Install a one-shot idle handler to launch the threads
Glib::signal_idle().connect(
sigc::bind_return(sigc::mem_fun(dispatcher, &Dispatcher::launch_threads), false));
main_loop->run();
return 0;
}
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