* Rewrote 'select' based polling in the client and finished the

'epoll' code. The client selects whichever is available on the current
platform.


git-svn-id: svn://rakshasa.no/libtorrent/trunk/rtorrent@510 e378c898-3ddf-0310-93e7-cc216c733640

src/core/poll_manager_epoll.cc

@@ -0,0 +1,112 @@
+// rTorrent - BitTorrent client
+// Copyright (C) 2005, Jari Sundell
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU 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
+//
+// In addition, as a special exception, the copyright holders give
+// permission to link the code of portions of this program with the
+// OpenSSL library under certain conditions as described in each
+// individual source file, and distribute linked combinations
+// including the two.
+//
+// You must obey the GNU General Public License in all respects for
+// all of the code used other than OpenSSL.  If you modify file(s)
+// with this exception, you may extend this exception to your version
+// of the file(s), but you are not obligated to do so.  If you do not
+// wish to do so, delete this exception statement from your version.
+// If you delete this exception statement from all source files in the
+// program, then also delete it here.
+//
+// Contact:  Jari Sundell <jaris@ifi.uio.no>
+//
+//           Skomakerveien 33
+//           3185 Skoppum, NORWAY
+
+#include "config.h"
+
+#include <stdexcept>
+#include <torrent/poll_epoll.h>
+#include <torrent/torrent.h>
+
+#include "poll_manager_epoll.h"
+
+namespace core {
+
+PollManagerEPoll*
+PollManagerEPoll::create(int maxOpenSockets) {
+  torrent::PollEPoll* p = torrent::PollEPoll::create(maxOpenSockets);
+
+  if (p == NULL)
+    return NULL;
+
+  PollManagerEPoll* manager = new PollManagerEPoll(maxOpenSockets);
+  manager->m_poll = p;
+
+  return manager;
+}
+
+PollManagerEPoll::~PollManagerEPoll() {
+  delete m_poll;
+}
+
+torrent::Poll*
+PollManagerEPoll::get_torrent_poll() {
+  return m_poll;
+}
+
+void
+PollManagerEPoll::poll(utils::Timer timeout) {
+  timeout = std::min(timeout, utils::Timer(torrent::get_next_timeout()));
+
+  if (m_httpStack.is_busy()) {
+    // When we're using libcurl we need to use select, but as this is
+    // inefficient we try avoiding it whenever possible.
+    FD_ZERO(m_readSet);
+    FD_ZERO(m_writeSet);
+    FD_ZERO(m_errorSet);
+    FD_SET(m_poll->get_fd(), m_readSet);
+
+    unsigned int maxFd = std::max((unsigned int)m_poll->get_fd(),
+				  m_httpStack.fdset(m_readSet, m_writeSet, m_errorSet));
+
+    if (maxFd >= m_maxOpenSockets)
+      throw std::runtime_error("Error polling, maxFd >= m_maxOpenSockets");
+
+    timeval t = timeout.tval();
+
+    if (select(maxFd + 1, m_readSet, m_writeSet, m_errorSet, &t) == -1)
+      return check_error();
+
+    m_httpStack.perform();
+
+    if (!FD_ISSET(m_poll->get_fd(), m_readSet))
+      return;
+
+    // Clear the timeout since we've already used it in the select call.
+    timeout = utils::Timer();
+  }
+
+  // Yes, below is how much code really *should* have been in this
+  // function. ;)
+  torrent::perform();
+
+  if (m_poll->poll(timeout.usec() / 1000) == -1)
+    return check_error();
+
+  m_poll->perform();
+  torrent::perform();
+}
+
+}