2 files changed, 31 insertions, 0 deletions
diff --git a/includes/database.mysql.inc b/includes/database.mysql.inc
index f13636b90..2f771d9e6 100644
--- a/includes/database.mysql.inc
+++ b/includes/database.mysql.inc
@@ -270,6 +270,21 @@ function db_escape_string($text) {
 }
 
 /**
+ * Lock a table.
+ */
+function db_lock_table($table) {
+  db_query('LOCK TABLES {%s} WRITE', $table);
+}
+
+/**
+ * Unlock all locked tables.
+ */
+function db_unlock_tables() {
+  db_query('UNLOCK TABLES');
+}
+
+
+/**
  * @} End of "ingroup database".
  */
 
diff --git a/includes/database.pgsql.inc b/includes/database.pgsql.inc
index 12070dd30..33c960a20 100644
--- a/includes/database.pgsql.inc
+++ b/includes/database.pgsql.inc
@@ -256,6 +256,22 @@ function db_escape_string($text) {
 }
 
 /**
+ * Lock a table.
+ * This function automatically starts a transaction.
+ */
+function db_lock_table($table) {
+  db_query('BEGIN; LOCK TABLE {%s} IN EXCLUSIVE MODE', $table);
+}
+
+/**
+ * Unlock all locked tables.
+ * This function automatically commits a transation.
+ */
+function db_unlock_tables() {
+  db_query('COMMIT');
+}
+
+/**
  * @} End of "ingroup database".
  */