1. one thing is set as conditional/dependent on the other
as long as this happens, that will happen
The phrase 'so long as' or 'as long as' indicates something that has been going on the whole time, similar to 'for as long as': "As long as they have known each other, they have been good friends." "They always try to stay in France for as long as possible over the Summer." It can also mean something is dependent on another thing: "As long as you do your homework you can go to the party." This is a phrase you will find in professional and social contexts. Similar phrases include, 'inasmuch as', 'provided that', and 'during the time that.'