So based on the feedback and suggestions here this is the interface I suggest:
\connect& - to open a new connection keeping the existing one \g& - to submit a command asynchronously (like & in the shell) \S [Sess#] - to _S_witch to a different _S_ession - if no connection # specified list available _S_essions \D - _D_isconnect from current session (like ^D in the shell) This leaves no way to submit an asynchronous command without using \g but I'm really not too concerned with that. I don't want to start messing with psql's semicolon parsing behaviour and I'm mainly only concerned with this for regression tests. Another thought I had for the future is a \C command to simulate C-c and send a query cancel. That would let us have regression tests that query cancellation worked. The tests would presumably have to be written using pg_sleep() to ensure they ran for long enough but even then there would be no way to control exactly when the interrupt arrived. Attached is an updated patch. I also found and fixed some missing ResetCancelConn()s. I think I got them all and the behaviour seems correct in practice when cancelling various combinations of synchronous queries, asynchronous queries, and backslash commands. The one thing I wonder about is that I'm a bit concerned I may have introduced an assumption about how many resultsets arrive from a single query. I'll be offline for a few days but I'll be back Monday.
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-- Gregory Stark EnterpriseDB http://www.enterprisedb.com
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