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> The problem for me is that if the Lua code does anything that raises a
> PostgreSQL error, I have to limit what further calls happen to other
> backend functions until some subtransaction level that encloses the
> error is properly aborted and released. At present, I can do that easily
> because Lua code has no way to catch errors except for pcall(), and I
> replace the normal pcall() function with one that creates a
> subtransaction, lua_pcall's the specified function, and releases the
> subtransaction on either return or error (and before calling the
> supplied error handler in the case of xpcall). This guarantees that the
> Lua code can not do anything unsafe in between the generation of the
> error and its being cleaned up.

What about Sony's suggestion, of running the sandboxed code inside
a coroutine and using yields to stop the code? (BTW, that seems a
good practice for any sandbox, independently of this to-be-closed

-- Roberto