In a procedure called from the top level or an anonymous code block
     (DO command) called from the top level it is possible
     to control transactions.  To commit the current transaction, call the
     commit command.  To roll back the current transaction,
     call the rollback command.  (Note that it is not
     possible to run the SQL commands COMMIT or
     ROLLBACK via spi_exec or similar.
     It has to be done using these functions.)  After a transaction is ended,
     a new transaction is automatically started, so there is no separate
     command for that.
    
Here is an example:
CREATE PROCEDURE transaction_test1()
LANGUAGE pltcl
AS $$
for {set i 0} {$i < 10} {incr i} {
    spi_exec "INSERT INTO test1 (a) VALUES ($i)"
    if {$i % 2 == 0} {
        commit
    } else {
        rollback
    }
}
$$;
CALL transaction_test1();
Transactions cannot be ended when an explicit subtransaction is active.