Add qof_finalize_backend_libraries() which is called during shutdown. This routine checks each backend

library for an exported qof_backend_module_finalize() routine, and if it exists, calls it so that the
backend can free any resources which have been allocated.


git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@18485 57a11ea4-9604-0410-9ed3-97b8803252fd

src/libqof/qof/qofbackend.c

@@ -502,6 +502,8 @@ qof_backend_commit_exists(const QofBackend *be)
     }
 }
 
+static GSList* backend_module_list = NULL;
+
 gboolean
 qof_load_backend_library (const char *directory, const char* module_name)
 {
@@ -523,7 +525,25 @@ qof_load_backend_library (const char *directory, const char* module_name)
         module_init_func();
 
     g_module_make_resident(backend);
+	backend_module_list = g_slist_prepend( backend_module_list, backend );
     return TRUE;
 }
 
+void
+qof_finalize_backend_libraries(void)
+{
+    GSList* node;
+	GModule* backend;
+    void (*module_finalize_func) (void);
+
+	for (node = backend_module_list; node != NULL; node = node->next) {
+	    backend = (GModule*)node->data;
+
+        if (g_module_symbol(backend, "qof_backend_module_finalize",
+                        (gpointer)&module_finalize_func))
+            module_finalize_func();
+
+	}
+}
+
 /************************* END OF FILE ********************************/

src/libqof/qof/qofbackend.h

@@ -269,6 +269,9 @@ KvpFrame* qof_backend_get_config(QofBackend *be);
 gboolean
 qof_load_backend_library(const gchar *directory, const gchar* module_name);
 
+/** \brief Finalize all loaded backend sharable libraries. */
+void qof_finalize_backend_libraries(void);
+
 /** \brief Retrieve the backend used by this book */
 QofBackend* qof_book_get_backend (const QofBook *book);
 

src/libqof/qof/qofutil.c

@@ -523,6 +523,7 @@ qof_close(void)
     qof_query_shutdown ();
     qof_object_shutdown ();
     guid_shutdown ();
+	qof_finalize_backend_libraries();
     qof_util_string_cache_destroy ();
     qof_log_shutdown();
 }