diff -r 99a41f48e29b -r 61668c57f4bb src/evsql.h
--- a/src/evsql.h	Sun Oct 12 20:10:47 2008 +0300
+++ b/src/evsql.h	Sun Oct 12 21:59:52 2008 +0300
@@ -136,6 +136,11 @@
 typedef void (*evsql_trans_ready_cb)(struct evsql_trans *trans, void *arg);
 
 /*
+ * The transaction was commited, and should not be used anymore.
+ */
+typedef void (*evsql_trans_done_cb)(struct evsql_trans *trans, void *arg);
+
+/*
  * Create a new PostgreSQL/libpq(evpq) -based evsql using the given conninfo.
  *
  * The given conninfo must stay valid for the duration of the evsql's lifetime.
@@ -147,9 +152,11 @@
  *
  * Transactions are separate connections that provide transaction-isolation.
  *
- * Once the transaction is ready for use, ready_fn will be called. If the transaction fails, any pending query will be forgotten, and error_fn called.
+ * Once the transaction is ready for use, ready_fn will be called. If the transaction fails, any pending query will be
+ * forgotten, and error_fn called. This also includes some (but not all) cases where evsql_query returns nonzero.
+ *
  */
-struct evsql_trans *evsql_trans (struct evsql *evsql, enum evsql_trans_type type, evsql_trans_error_cb error_fn, evsql_trans_ready_cb ready_fn, void *cb_arg);
+struct evsql_trans *evsql_trans (struct evsql *evsql, enum evsql_trans_type type, evsql_trans_error_cb error_fn, evsql_trans_ready_cb ready_fn, evsql_trans_done_cb done_fn, void *cb_arg);
 
 /*
  * Queue the given query for execution.
@@ -168,6 +175,26 @@
 struct evsql_query *evsql_query_params (struct evsql *evsql, struct evsql_trans *trans, const char *command, const struct evsql_query_params *params, evsql_query_cb query_fn, void *cb_arg);
 
 /*
+ * Commit a transaction, calling done_fn if it was succesfull (error_fn otherwise).
+ */
+int evsql_trans_commit (struct evsql_trans *trans);
+
+/*
+ * Abort a transaction, rolling it back. No callbacks will be called, unless this function returns nonzero, in which
+ * case error_fn might be called.
+ */
+int evsql_trans_abort (struct evsql_trans *trans);
+
+/*
+ * Transaction-handling functions
+ */
+
+// error string, meant to be called from evsql_trans_error_cb
+const char *evsql_trans_error (struct evsql_trans *trans);
+
+// commit the transaction, calling 
+
+/*
  * Param-building functions
  */
 int evsql_param_string (struct evsql_query_params *params, size_t param, const char *ptr);