[tracker/wip/passive-extraction] extract: Ensure a task is added to priv->running_tasks just once

[Carlos Garnacho <carlosg src gnome org>]

commit 8ed1b221eb87160a0956556283872a81c6460410
Author: Carlos Garnacho <carlosg gnome org>
Date:   Mon Jan 20 20:08:20 2014 +0100

    extract: Ensure a task is added to priv->running_tasks just once
    
    If a tasks was iterated over multiple extraction modules, the task
    ended up inserted on priv->running_tasks more than once, but only
    removed once when the task finished, leaving dangling pointers in
    priv->running_tasks.

 src/tracker-extract/tracker-extract.c |   12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)
---
diff --git a/src/tracker-extract/tracker-extract.c b/src/tracker-extract/tracker-extract.c
index 2f06924..25d5f9b 100644
--- a/src/tracker-extract/tracker-extract.c
+++ b/src/tracker-extract/tracker-extract.c
@@ -663,10 +663,6 @@ dispatch_task_cb (TrackerExtractTask *task)
                return FALSE;
        }
 
-       g_mutex_lock (&priv->task_mutex);
-       priv->running_tasks = g_list_prepend (priv->running_tasks, task);
-       g_mutex_unlock (&priv->task_mutex);
-
        switch (thread_awareness) {
        case TRACKER_MODULE_NONE:
                /* Error out */
@@ -769,6 +765,14 @@ tracker_extract_file (TrackerExtract      *extract,
                g_simple_async_result_complete_in_idle (res);
                g_error_free (error);
        } else {
+               TrackerExtractPrivate *priv;
+
+               priv = TRACKER_EXTRACT_GET_PRIVATE (task->extract);
+
+               g_mutex_lock (&priv->task_mutex);
+               priv->running_tasks = g_list_prepend (priv->running_tasks, task);
+               g_mutex_unlock (&priv->task_mutex);
+
                g_idle_add ((GSourceFunc) dispatch_task_cb, task);
        }