Wait until all jobs finish before exit

Wait for all jobs before exiting main().
This allows clean execution of exit handlers.
Otherwise, the threads which executes the jobs could
access data already cleaned by exit handlers.

Fixes #1713

libview/ev-job-scheduler.c

@@ -317,3 +317,20 @@ ev_job_scheduler_get_running_thread_job (void)
 {
         return g_atomic_pointer_get (&running_job);
 }
+
+/**
+ * ev_job_scheduler_wait:
+ *
+ * Synchronously waits until all jobs are done.
+ * Remember that main loop is not running already probably.
+ */
+void
+ev_job_scheduler_wait (void)
+{
+	ev_debug_message (DEBUG_JOBS, "Waiting for empty job list");
+
+	while (job_list != NULL)
+		g_usleep (100);
+
+	ev_debug_message (DEBUG_JOBS, "Job list is empty");
+}

libview/ev-job-scheduler.h

@@ -48,4 +48,7 @@ void   ev_job_scheduler_update_job             (EvJob        *job,
 EV_PUBLIC
 EvJob *ev_job_scheduler_get_running_thread_job (void);
 
+EV_PUBLIC
+void   ev_job_scheduler_wait                   (void);
+
 G_END_DECLS

previewer/ev-previewer.c

@@ -331,6 +331,7 @@ main (gint argc, gchar **argv)
         if (print_settings_file)
                 ev_previewer_unlink_tempfile (print_settings_file);
 
+	ev_job_scheduler_wait ();
 	ev_shutdown ();
 	ev_stock_icons_shutdown ();
 

shell/main.c

@@ -318,6 +318,7 @@ main (int argc, char *argv[])
 	status = g_application_run (G_APPLICATION (application), 0, NULL);
 
     done:
+	ev_job_scheduler_wait ();
 	ev_shutdown ();
 	ev_stock_icons_shutdown ();