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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 <glibmm.h>
#include <algorithm>
#include <functional>
#include <iostream>
#include <list>
#include <memory>
namespace
{
class ThreadProgress : public sigc::trackable
{
public:
explicit ThreadProgress(int id);
virtual ~ThreadProgress();
void launch();
void join();
sigc::signal<void>& signal_finished();
int id() const;
virtual void reference() const { ++ref_count_; }
virtual void unreference() const { if (!(--ref_count_)) delete this; }
private:
Glib::Thread* thread_;
int id_;
unsigned int progress_;
Glib::Dispatcher signal_increment_;
sigc::signal<void> signal_finished_;
void progress_increment();
void thread_function();
mutable int ref_count_;
};
class Application : public sigc::trackable
{
public:
Application();
virtual ~Application();
void launch_threads();
void run();
private:
Glib::RefPtr<Glib::MainLoop> main_loop_;
std::list<ThreadProgress*> progress_list_;
std::list<Glib::RefPtr<ThreadProgress> > progress_ref_list_;
void on_progress_finished(ThreadProgress* thread_progress);
};
ThreadProgress::ThreadProgress(int id)
:
thread_ (0),
id_ (id),
progress_ (0),
ref_count_(0)
{
// Increment the reference count
reference();
// Connect to the cross-thread signal.
signal_increment_.connect(sigc::mem_fun(*this, &ThreadProgress::progress_increment));
}
ThreadProgress::~ThreadProgress()
{}
void ThreadProgress::launch()
{
// Create a joinable thread.
thread_ = Glib::Thread::create(sigc::mem_fun(*this, &ThreadProgress::thread_function), true);
}
void ThreadProgress::join()
{
thread_->join();
}
sigc::signal<void>& 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_;
std::cout << "Thread " << id_ << ": " << progress_ << '%' << std::endl;
if(progress_ >= 100)
signal_finished_();
}
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 main thread to increment the progress value.
signal_increment_();
}
}
Application::Application()
:
main_loop_ (Glib::MainLoop::create())
{
std::cout << "Thread Dispatcher Example." << std::endl;
for(int i = 1; i <= 5; ++i)
{
ThreadProgress* progress=new ThreadProgress(i);
progress_list_.push_back(progress);
progress_ref_list_.push_back(Glib::RefPtr<ThreadProgress>(progress));
progress->signal_finished().connect(
sigc::bind<1>(sigc::mem_fun(*this, &Application::on_progress_finished), progress));
}
}
Application::~Application()
{
}
void Application::launch_threads()
{
std::for_each(progress_list_.begin(), progress_list_.end(),
std::mem_fun(&ThreadProgress::launch));
}
void Application::run()
{
main_loop_->run();
}
void Application::on_progress_finished(ThreadProgress* thread_progress)
{
{
progress_list_.remove(thread_progress);
thread_progress->join();
std::cout << "Thread " << thread_progress->id()
<< ": finished." << std::endl;
}
if(progress_list_.empty())
main_loop_->quit();
}
} // anonymous namespace
int main(int, char**)
{
Glib::thread_init();
Application application;
// Install a one-shot idle handler to launch the threads
Glib::signal_idle().connect(
sigc::bind_return(sigc::mem_fun(application, &Application::launch_threads), false));
application.run();
return 0;
}
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