Should PostgresMain() do a LWLockReleaseAll()?

Hi,

Currently the error handling of normal backends only does a
LWLockReleaseAll() once CurrentTransactionState->state != TRANS_DEFAULT
because it's called in AbortTransaction(). There's pretty damn few
places that fiddle with lwlocks outside of a transaction command, but I
still do wonder whether it'd wouldn't be a tad more robust to
unconditionally do a LWLockReleaseAll(), just like other error handlers
are doing?
In comparison to the cost of a longjmp and the rest of error handling
that ought to be nearly free.

Greetings,

Andres Freund

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Andres Freund http://www.2ndQuadrant.com/
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