search for: use_first

...t require locks, so modifying should be done using only atomic operations. These include: - Replacing the file completely using rename() - We probably can't assume that writing more than one byte at a time is atomic. If we have to modify a larger dataset, we could do: - struct { bit_t use_first; dataset_t first; dataset_t second; } - when reading, we use first if use_first is set, second if it's unset - when writing, we first write to the non-used variable, only then we update the flag. - This of course requires twice the amount of space for dataset plus one ex...