Fix building.

git-svn-id: svn://localhost/ardour2/trunk@2791 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/glibmm2/examples/thread/dispatcher.cc

@@ -0,0 +1,226 @@
+/*
+ * Glib::Dispatcher example -- cross thread signalling
+ * by Daniel Elstner  <daniel.kitta@gmail.com>
+ *
+ * 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 <vector>
+
+namespace
+{
+
+/*
+ * Note that it does not make sense for this class to inherit from
+ * sigc::trackable, as doing so would only give a false sense of security.
+ * Once the thread launch has been triggered, the object has to stay alive
+ * until the thread has been joined again.  The code running in the thread
+ * assumes the existence of the object.  If it is destroyed earlier, the
+ * program will crash, with sigc::trackable or without it.
+ */
+class ThreadProgress
+{
+public:
+  explicit ThreadProgress(int id);
+  virtual ~ThreadProgress();
+
+  int  id() const;
+  void launch();
+  void join();
+  bool unfinished() const;
+
+  sigc::signal<void>& signal_finished();
+
+private:
+  enum { ITERATIONS = 100 };
+
+  // Note that the thread does not write to the member data at all.  It only
+  // reads signal_increment_, which is only written to before the thread is
+  // lauched.  Therefore, no locking is required.
+  Glib::Thread*       thread_;
+  int                 id_;
+  unsigned int        progress_;
+  Glib::Dispatcher    signal_increment_;
+  sigc::signal<void>  signal_finished_;
+
+  void progress_increment();
+  void thread_function();
+};
+
+class Application : public sigc::trackable
+{
+public:
+  Application();
+  virtual ~Application();
+
+  void run();
+
+private:
+  Glib::RefPtr<Glib::MainLoop>  main_loop_;
+  std::vector<ThreadProgress*>  progress_threads_;
+
+  void launch_threads();
+  void on_progress_finished(ThreadProgress* thread_progress);
+};
+
+template <class T>
+class DeletePtr : public std::unary_function<void, T>
+{
+public:
+  void operator()(T ptr) const { delete ptr; }
+};
+
+ThreadProgress::ThreadProgress(int id)
+:
+  thread_   (0),
+  id_       (id),
+  progress_ (0)
+{
+  // Connect to the cross-thread signal.
+  signal_increment_.connect(sigc::mem_fun(*this, &ThreadProgress::progress_increment));
+}
+
+ThreadProgress::~ThreadProgress()
+{
+  // It is an error if the thread is still running at this point.
+  g_return_if_fail(thread_ == 0);
+}
+
+int ThreadProgress::id() const
+{
+  return id_;
+}
+
+void ThreadProgress::launch()
+{
+  // Create a joinable thread.
+  thread_ = Glib::Thread::create(sigc::mem_fun(*this, &ThreadProgress::thread_function), true);
+}
+
+void ThreadProgress::join()
+{
+  thread_->join();
+  thread_ = 0;
+}
+
+bool ThreadProgress::unfinished() const
+{
+  return (progress_ < ITERATIONS);
+}
+
+sigc::signal<void>& ThreadProgress::signal_finished()
+{
+  return signal_finished_;
+}
+
+void ThreadProgress::progress_increment()
+{
+  ++progress_;
+  std::cout << "Thread " << id_ << ": " << progress_ << '%' << std::endl;
+
+  if (progress_ >= ITERATIONS)
+    signal_finished_();
+}
+
+void ThreadProgress::thread_function()
+{
+  Glib::Rand rand;
+
+  for (int i = 0; i < ITERATIONS; ++i)
+  {
+    Glib::usleep(rand.get_int_range(2000, 20000));
+
+    // Tell the main thread to increment the progress value.
+    signal_increment_();
+  }
+}
+
+Application::Application()
+:
+  main_loop_        (Glib::MainLoop::create()),
+  progress_threads_ (5)
+{
+  // Note that unless you're targetting an embedded platform, you can assume
+  // exceptions to be enabled.  The #ifdef is only here to make the example
+  // compile in either case; you may ignore it otherwise.
+#ifdef GLIBMM_EXCEPTIONS_ENABLED
+  try
+#endif
+  {
+    for (std::vector<ThreadProgress*>::size_type i = 0; i < progress_threads_.size(); ++i)
+    {
+      ThreadProgress *const progress = new ThreadProgress(i + 1);
+      progress_threads_[i] = progress;
+
+      progress->signal_finished().connect(
+          sigc::bind<1>(sigc::mem_fun(*this, &Application::on_progress_finished), progress));
+    }
+  }
+#ifdef GLIBMM_EXCEPTIONS_ENABLED
+  catch (...)
+  {
+    // In your own code, you should preferably use a smart pointer
+    // to ensure exception safety.
+    std::for_each(progress_threads_.begin(), progress_threads_.end(),
+                  DeletePtr<ThreadProgress*>());
+    throw;
+  }
+#endif
+}
+
+Application::~Application()
+{
+  std::for_each(progress_threads_.begin(), progress_threads_.end(),
+                DeletePtr<ThreadProgress*>());
+}
+
+void Application::run()
+{
+  // Install a one-shot idle handler to launch the threads.
+  Glib::signal_idle().connect(
+      sigc::bind_return(sigc::mem_fun(*this, &Application::launch_threads), false));
+
+  main_loop_->run();
+}
+
+void Application::launch_threads()
+{
+  std::cout << "Launching " << progress_threads_.size() << " threads:" << std::endl;
+
+  std::for_each(progress_threads_.begin(), progress_threads_.end(),
+                std::mem_fun(&ThreadProgress::launch));
+}
+
+void Application::on_progress_finished(ThreadProgress* thread_progress)
+{
+  thread_progress->join();
+
+  std::cout << "Thread " << thread_progress->id() << ": finished." << std::endl;
+
+  // Quit if it was the last thread to be joined.
+  if (std::find_if(progress_threads_.begin(), progress_threads_.end(),
+                   std::mem_fun(&ThreadProgress::unfinished)) == progress_threads_.end())
+  {
+    main_loop_->quit();
+  }
+}
+
+} // anonymous namespace
+
+int main(int, char**)
+{
+  Glib::thread_init();
+
+  Application application;
+  application.run();
+
+  return 0;
+}