/*  GFC threads example. * *  Based on the GTK threads example in the GTK+ FAQ sheet *  Copyright (C) 1999, Erik Mouw, <J.A.K.Mouwits.tudelft.nl> */#include "thread.hh"#include <gfc/glib/rand.hh>#include <gfc/glib/thread.hh>using namespace GFC;namespace {G::StaticMutex mutex = GFC_STATIC_MUTEX_INIT;const int YES_IT_IS = 1;const int NO_IT_IS_NOT = 0;} // namespacevolatile int Window::yes_or_no = YES_IT_IS;Window::Window(){	set_title("Thread Example");	set_border_width(10);	// create a label	label = new Gtk::Label("And now for something completely different ...");	add(*label);	label->show();	// init random number generator	G::random_set_seed((unsigned int)time(0));	// create the threads	G::Thread *thread = G::Thread::create(sigc::bind(sigc::mem_fun(this, &Window::on_argument), YES_IT_IS), false);	thread = G::Thread::create(sigc::bind(sigc::mem_fun(this, &Window::on_argument), NO_IT_IS_NOT), false);	show();}Window::~Window(){}voidWindow::on_argument(int what){	bool say_something;	for (;;)	{		// sleep for  while		G::usleep((G::random_int() / (RAND_MAX / 3) + 1) * (G_USEC_PER_SEC / 2));		// lock the yes_or_no_variable		mutex.lock();		// do we have to say something?		say_something = (yes_or_no != what);		if (say_something)		{			// set the variable			yes_or_no = what;		}		// unlock the yes_or_no variable		mutex.unlock();		if (say_something)		{			// lock the GTK thread			Gdk::Mutex::lock();			// set the label text			if(what == YES_IT_IS)				label->set_text("Oh yes, it is!");			else				label->set_text("Oh no, it isn't!");			// unlock the GTK thread			Gdk::flush(); 			Gdk::Mutex::unlock();		}	}}int main (int argc, char *argv[]){	using namespace Main;	// init thread support	threads_init();	// init GTK+	init(&argc, &argv);	// create a window 	Window window;	window.sig_destroy().connect(sigc::ptr_fun(&GFC::Main::quit));	// enter the main loop	Gdk::Mutex::lock();	run();	Gdk::Mutex::unlock();	return 0;}