+#define CF_JOURNAL_VAR(var) cf_journal_block(&(var), sizeof(var)) // Store a single value into the journal
+
+struct cf_journal_item; /** Opaque identifier of the journal state. **/
+/**
+ * Starts a new transaction. It returns the current state so you can
+ * get back to it. The @new_pool parameter tells if a new memory pool
+ * should be created and used from now.
+ **/
+struct cf_journal_item *cf_journal_new_transaction(uns new_pool);
+/**
+ * Marks current state as a complete transaction. The @new_pool
+ * parameter tells if the transaction was created with new memory pool
+ * (the parameter must be the same as the one with
+ * @cf_journal_new_transaction() was called with). The @oldj parameter
+ * is the journal state returned from last
+ * @cf_journal_new_transaction() call.
+ **/
+void cf_journal_commit_transaction(uns new_pool, struct cf_journal_item *oldj);
+/**
+ * Returns to an old journal state, reverting anything the current
+ * transaction did. The @new_pool parameter must be the same as the
+ * one you used when you created the transaction. The @oldj parameter
+ * is the journal state you got from @cf_journal_new_transaction() --
+ * it is the state to return to.
+ **/
+void cf_journal_rollback_transaction(uns new_pool, struct cf_journal_item *oldj);