freezing window

[Alessandro <ale barbato gmail com>]

Hello all,
I have a problem while redirect the output of a spawned process to a 
gtkTextView.
The problem is that: when I run the process the window freezing, until 
the process end.
Can anyone help me?
I add the code used for spawn the process:

void launch_script(char command[10][100], GtkTextBuffer *OutputBuffer, 
GtkWidget *TextView ) {

 gint std_in;
 gint std_out;
 gint std_err;
 static gchar buf[1024*8];
 static gchar *buffer_utf8;
 char *argv1[] = { command[0], 
command[1],command[2],command[3],command[4],command[5],command[6],command[7],command[8],command[9], 
NULL };

 if( g_spawn_async_with_pipes("./", // gchar *working_directory
                  argv1, //gchar **argv,
                  NULL, //gchar **envp,
                  G_SPAWN_SEARCH_PATH, //GSpawnFlags flags,
                  NULL, //GSpawnChildSetupFunc child_setup,
                  NULL, //gpointer user_data,
                  NULL, //GPid *child_pid,
                  &std_in, // gint *standard_input,
                  &std_out, //gint *standard_output,
                  &std_err, //gint *standard_error,
                  NULL /*GError **error*/)
     ) {
   if(&std_out){
     GIOChannel* output = g_io_channel_unix_new(std_out);
     g_io_channel_read_chars (output, // GIOChannel *channel
                  buf,    // gchar *buf
                  -1,    // gsize count
                  NULL,   // gsize *bytes_read,
                  NULL    //GError **error
                  );
   }
   else if(&std_err) {
     GIOChannel* output = g_io_channel_unix_new(std_err);
     g_io_channel_read_chars (output, // GIOChannel *channel
                  buf,    // gchar *buf
                  -1,    // gsize count
                  NULL,   // gsize *bytes_read,
                  NULL    //GError **error
                  );
   }
 }
 else {
   sprintf(buf, "Impossible to run program\n");
 }

 OutputBuffer = gtk_text_buffer_new (NULL);

 buffer_utf8 = g_locale_to_utf8 (buf, -1, NULL, NULL, NULL);

 gtk_text_buffer_insert_at_cursor(OutputBuffer,buffer_utf8,-1);

 g_free (buffer_utf8);

 gtk_text_view_set_buffer (GTK_TEXT_VIEW(TextView),OutputBuffer);

}

Thanks to all, bye
Alessandro