Initial revision

git-svn-id: svn://localhost/trunk/ardour2@4 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/glibmm2/glibmm/threadpool.cc

@@ -0,0 +1,245 @@
+// -*- c++ -*-
+/* $Id$ */
+
+/* Copyright (C) 2002 The gtkmm Development Team
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <glibmm/threadpool.h>
+#include <glibmm/exceptionhandler.h>
+#include <glib.h>
+#include <list>
+#include <glibmmconfig.h>
+
+GLIBMM_USING_STD(list)
+
+
+namespace Glib
+{
+
+// internal
+class ThreadPool::SlotList
+{
+public:
+  SlotList();
+  ~SlotList();
+
+  sigc::slot<void>* push(const sigc::slot<void>& slot);
+  sigc::slot<void>  pop(sigc::slot<void>* slot_ptr);
+
+  void lock_and_unlock();
+
+private:
+  Glib::Mutex                     mutex_;
+  std::list< sigc::slot<void> >  list_;
+
+  // noncopyable
+  SlotList(const ThreadPool::SlotList&);
+  ThreadPool::SlotList& operator=(const ThreadPool::SlotList&);
+};
+
+ThreadPool::SlotList::SlotList()
+{}
+
+ThreadPool::SlotList::~SlotList()
+{}
+
+sigc::slot<void>* ThreadPool::SlotList::push(const sigc::slot<void>& slot)
+{
+  Mutex::Lock lock (mutex_);
+
+  list_.push_back(slot);
+  return &list_.back();
+}
+
+sigc::slot<void> ThreadPool::SlotList::pop(sigc::slot<void>* slot_ptr)
+{
+  sigc::slot<void> slot;
+
+  {
+    Mutex::Lock lock (mutex_);
+
+    std::list< sigc::slot<void> >::iterator pslot = list_.begin();
+    while(pslot != list_.end() && slot_ptr != &*pslot)
+      ++pslot;
+
+    if(pslot != list_.end())
+    {
+      slot = *pslot;
+      list_.erase(pslot);
+    }
+  }
+
+  return slot;
+}
+
+void ThreadPool::SlotList::lock_and_unlock()
+{
+  mutex_.lock();
+  mutex_.unlock();
+}
+
+} // namespace Glib
+
+
+namespace
+{
+
+static void call_thread_entry_slot(void* data, void* user_data)
+{
+  try
+  {
+    Glib::ThreadPool::SlotList *const slot_list =
+        static_cast<Glib::ThreadPool::SlotList*>(user_data);
+
+    sigc::slot<void> slot (slot_list->pop(static_cast<sigc::slot<void>*>(data)));
+
+    slot();
+  }
+  catch(Glib::Thread::Exit&)
+  {
+    // Just exit from the thread.  The Thread::Exit exception
+    // is our sane C++ replacement of g_thread_exit().
+  }
+  catch(...)
+  {
+    Glib::exception_handlers_invoke();
+  }
+}
+
+} // anonymous namespace
+
+
+namespace Glib
+{
+
+ThreadPool::ThreadPool(int max_threads, bool exclusive)
+:
+  gobject_   (0),
+  slot_list_ (new SlotList())
+{
+  GError* error = 0;
+
+  gobject_ = g_thread_pool_new(
+      &call_thread_entry_slot, slot_list_, max_threads, exclusive, &error);
+
+  if(error)
+  {
+    delete slot_list_;
+    slot_list_ = 0;
+    Glib::Error::throw_exception(error);
+  }
+}
+
+ThreadPool::~ThreadPool()
+{
+  if(gobject_)
+    g_thread_pool_free(gobject_, 1, 1);
+
+  if(slot_list_)
+  {
+    slot_list_->lock_and_unlock();
+    delete slot_list_;
+  }
+}
+
+void ThreadPool::push(const sigc::slot<void>& slot)
+{
+  sigc::slot<void> *const slot_ptr = slot_list_->push(slot);
+
+  GError* error = 0;
+  g_thread_pool_push(gobject_, slot_ptr, &error);
+
+  if(error)
+  {
+    slot_list_->pop(slot_ptr);
+    Glib::Error::throw_exception(error);
+  }
+}
+
+void ThreadPool::set_max_threads(int max_threads)
+{
+  GError* error = 0;
+  g_thread_pool_set_max_threads(gobject_, max_threads, &error);
+
+  if(error)
+    Glib::Error::throw_exception(error);
+}
+
+int ThreadPool::get_max_threads() const
+{
+  return g_thread_pool_get_max_threads(gobject_);
+}
+
+unsigned int ThreadPool::get_num_threads() const
+{
+  return g_thread_pool_get_num_threads(gobject_);
+}
+
+unsigned int ThreadPool::unprocessed() const
+{
+  return g_thread_pool_unprocessed(gobject_);
+}
+
+bool ThreadPool::get_exclusive() const
+{
+  g_return_val_if_fail(gobject_ != 0, false);
+
+  return gobject_->exclusive;
+}
+
+void ThreadPool::shutdown(bool immediately)
+{
+  if(gobject_)
+  {
+    g_thread_pool_free(gobject_, immediately, 1);
+    gobject_ = 0;
+  }
+
+  if(slot_list_)
+  {
+    slot_list_->lock_and_unlock();
+    delete slot_list_;
+    slot_list_ = 0;
+  }
+}
+
+// static
+void ThreadPool::set_max_unused_threads(int max_threads)
+{
+  g_thread_pool_set_max_unused_threads(max_threads);
+}
+
+// static
+int ThreadPool::get_max_unused_threads()
+{
+  return g_thread_pool_get_max_unused_threads();
+}
+
+// static
+unsigned int ThreadPool::get_num_unused_threads()
+{
+  return g_thread_pool_get_num_unused_threads();
+}
+
+// static
+void ThreadPool::stop_unused_threads()
+{
+  g_thread_pool_stop_unused_threads();
+}
+
+} // namespace Glib
+