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worker-pool.cc

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
 * Pan - A Newsreader for Gtk+
 * Copyright (C) 2002-2007 Charles Kerr <charles@rebelbase.com>
 *
 * This file
 * Copyright (C) 2007 Calin Culianu <calin@ajvar.org>
 *
 * This file is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <cassert>
#include <glib/gmain.h> // for g_idle_add
#include <pan/general/debug.h>
#include <pan/general/macros.h>
#include "worker-pool.h"

using namespace pan;

00031 WorkerPool :: WorkerPool (int n, bool exclusive)
{
  assert ((!exclusive || n>0) && "can't have unlimited exclusive threads!");
  tpool = g_thread_pool_new (Worker::worker_thread_func, this, n, exclusive, 0);
}

void
00038 WorkerPool :: cancel_all_silently ()
{
  foreach (WorkerSet, my_workers, it)
    (*it)->cancel_silently ();
}

WorkerPool :: ~WorkerPool ()
{
  foreach (WorkerSet, my_workers, it) {
    (*it)->pool = 0;
    (*it)->cancel ();
  }

  // blocks until *all* workers, both running and queued, have run.
  g_thread_pool_free (tpool, false, true);
}

/***
****
***/

void
00060 WorkerPool :: push_work (Worker *w, Worker::Listener *l, bool delete_worker)
{
  w->cancelled = false;
  w->silent = false;
  w->pool = this;
  w->listener = l;
  w->delete_worker = delete_worker;
  my_workers.insert (w);
  g_thread_pool_push (tpool, w, 0); // jump to worker_thread_func
}

void
WorkerPool :: Worker :: worker_thread_func (gpointer g, gpointer unused UNUSED)
{
  static_cast<Worker*>(g)->do_work ();
  g_idle_add (main_thread_cleanup_cb, g); // jump to main_thread_cleanup_cb
}

gboolean
WorkerPool :: Worker :: main_thread_cleanup_cb (gpointer g)
{
  static_cast<Worker*>(g)->main_thread_cleanup ();
  return false; // tell main loop that we're done
}

void
WorkerPool :: Worker :: main_thread_cleanup ()
{
  if (listener && !silent)
      listener->on_worker_done (was_cancelled());

  if (pool)
      pool->my_workers.erase (this);

  if (delete_worker)
      delete this;
}

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