Description:
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When using multiple connections switching on and off autocommit seems to confuse the drivers internal state machine. Autocommit stays off even when it shouldn't.
The code pasted below SHOULD deadlock with the two concurrent inserts but it doesn't.
If you leave out all the lines above it will hang as expected.

Reproduce code:
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$link1 = ingres2_connect( ... );
$link2 = ingres2_connect( ... );

ingres2_autocommit($link1);
ingres2_autocommit($link2);

$res1 = ingres2_query($link1, "select * from table");
$res2 = ingres2_query($link2, "select * from table");

ingres2_autocommit($link1);
ingres2_autocommit($link2);

$res1 = ingres2_query($link1, "insert into table values ( ... )");
$res2 = ingres2_query($link2, "insert into table values ( ... )");