Ticket #6005: epoll_reactor.hpp.patch_1.40.0

--- epoll_reactor.hpp   2011-10-11 10:28:00.000000000 +0800
+++ epoll_reactor.hpp.new       2011-10-11 10:27:41.000000000 +0800
@@ -65,7 +65,7 @@
   epoll_reactor(boost::asio::io_service& io_service)
     : boost::asio::detail::service_base<epoll_reactor<Own_Thread> >(io_service),
       mutex_(),
-      epoll_fd_(do_epoll_create()),
+      epoll_fd_(-1),
       wait_in_progress_(false),
       interrupter_(),
       read_op_queue_(),
@@ -77,6 +77,8 @@
       shutdown_(false),
       need_epoll_wait_(true)
   {
+    epoll_fd_ = do_epoll_create();
+
     // Start the reactor's internal thread only if needed.
     if (Own_Thread)
     {
@@ -96,7 +98,9 @@
   ~epoll_reactor()
   {
     shutdown_service();
-    close(epoll_fd_);
+
+    if (epoll_fd_ != -1)
+      close(epoll_fd_);
   }

   // Destroy all user-defined handler objects owned by the service.