[gvfs] [FTP] reuse cancellable instead of creating a new one

[Benjamin Otte <otte src gnome org>]

commit 9d7a1de3017e240b0af23d2a51237d75fb14ae09
Author: Benjamin Otte <otte gnome org>
Date:   Tue Jun 9 12:24:09 2009 +0200

    [FTP] reuse cancellable instead of creating a new one
    
    Now that a corner case in glib was fixed, it's possible to use
    g_cancellable_reset() and reuse the cancellable after timeouts instead
    of creating a new one.
    
    If you want to avoid random hangs and g_critical()s when transferring
    files, you need glib commit ced88fd0de4aedb537552561582875b427081eeb
    I've update the glib requirements accordingly.
---
 configure.ac            |    2 +-
 daemon/gvfsbackendftp.c |   37 +++++++++++++++++++------------------
 2 files changed, 20 insertions(+), 19 deletions(-)

diff --git a/configure.ac b/configure.ac
index 80341eb..f1dd70b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -45,7 +45,7 @@ GTK_DOC_CHECK
 DISTCHECK_CONFIGURE_FLAGS="--enable-gtk-doc"
 AC_SUBST(DISTCHECK_CONFIGURE_FLAGS)
 
-PKG_CHECK_MODULES(GLIB, glib-2.0 >= 2.21.1 gthread-2.0 gobject-2.0 gmodule-no-export-2.0 gio-unix-2.0 gio-2.0 )
+PKG_CHECK_MODULES(GLIB, glib-2.0 >= 2.21.2 gthread-2.0 gobject-2.0 gmodule-no-export-2.0 gio-unix-2.0 gio-2.0 )
 AC_SUBST(GLIB_CFLAGS)
 AC_SUBST(GLIB_LIBS)
 
diff --git a/daemon/gvfsbackendftp.c b/daemon/gvfsbackendftp.c
index b63a66a..0c35fa3 100644
--- a/daemon/gvfsbackendftp.c
+++ b/daemon/gvfsbackendftp.c
@@ -1187,23 +1187,29 @@ ftp_output_stream_splice (GOutputStream *output,
   gssize n_read, n_written;
   gssize bytes_copied;
   char buffer[8192], *p;
-  GCancellable *timer_cancel;
+  GCancellable *current, *timer_cancel;
   gulong cancel_cb_id;
 
   bytes_copied = 0;
-  timer_cancel = NULL;
-
+  if (progress_callback)
+    {
+      timer_cancel = g_cancellable_new ();
+      cancel_cb_id = g_cancellable_connect (cancellable, 
+                                            G_CALLBACK (cancel_timer_cb),
+                                            timer_cancel,
+                                            NULL);
+    }
+  current = cancellable;
   for (;;) 
     {
-      n_read = g_input_stream_read (input, buffer, sizeof (buffer), timer_cancel ? timer_cancel : cancellable, error);
+      n_read = g_input_stream_read (input, buffer, sizeof (buffer), current, error);
       if (n_read == -1)
         {
           if (g_cancellable_is_cancelled (timer_cancel) &&
               !g_cancellable_is_cancelled (cancellable))
             {
-              g_cancellable_disconnect (cancellable, cancel_cb_id);
-              g_object_unref (timer_cancel);
-              timer_cancel = NULL;
+              g_cancellable_reset (timer_cancel);
+              current = cancellable;
               g_clear_error (error);
               progress_callback (bytes_copied, total_size, progress_callback_data);
             }
@@ -1219,17 +1225,16 @@ ftp_output_stream_splice (GOutputStream *output,
       p = buffer;
       while (n_read > 0)
         {
-          n_written = g_output_stream_write (output, p, n_read, timer_cancel ? timer_cancel : cancellable, error);
+          n_written = g_output_stream_write (output, p, n_read, current, error);
           if (n_written == -1)
             {
               if (g_cancellable_is_cancelled (timer_cancel) &&
                   !g_cancellable_is_cancelled (cancellable))
                 {
-                  g_cancellable_disconnect (cancellable, cancel_cb_id);
-                  g_object_unref (timer_cancel);
-                  timer_cancel = NULL;
+                  g_cancellable_reset (timer_cancel);
+                  current = cancellable;
                   g_clear_error (error);
-                  progress_callback (bytes_copied + n_written, total_size, progress_callback_data);
+                  progress_callback (bytes_copied, total_size, progress_callback_data);
                 }
               else
                 {
@@ -1241,19 +1246,15 @@ ftp_output_stream_splice (GOutputStream *output,
           p += n_written;
           n_read -= n_written;
           bytes_copied += n_written;
-          if (progress_callback && timer_cancel == NULL)
+          if (progress_callback && current != timer_cancel)
             {
-              timer_cancel = g_cancellable_new ();
-              cancel_cb_id = g_cancellable_connect (cancellable, 
-                                                    G_CALLBACK (cancel_timer_cb),
-                                                    timer_cancel,
-                                                    NULL);
               g_object_ref (timer_cancel);
               g_timeout_add_seconds_full (G_PRIORITY_DEFAULT,
                                           1,
                                           cancel_cancellable,
                                           timer_cancel,
                                           g_object_unref);
+              current = timer_cancel;
             }
         }
     }