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Keep track of the used size of the array. That avoids looping through the whole array in a few places. It doesn't matter from a performance point of view since the array is small anyway, but this feels less surprising and is a little less code. Now that we have an explicit NumListenSockets variable that is statically initialized to 0, we don't need the loop to initialize the array. Allocate the array in PostmasterContext. The array isn't needed in child processes, so this allows reusing that memory. We could easily make the array resizable now, but we haven't heard any complaints about the current 64 sockets limit. Discussion: https://www.postgresql.org/message-id/7bb7ad65-a018-2419-742f-fa5fd877d338@iki.fi
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