i have actually used a 'pattern' to accomplish this several times, it always involved a bunch of flags (or checking for null) and checking everything everytime

i have actually used a 'pattern' to accomplish this several times, it always involved a bunch of flags (or checking for null) and checking everything everytime anything ended. i imagine encoding this pattern into a datastructure would be pretty useful. though i don't entirely agree with the name. this is really like a thread barrier but for asynchronous tasks. So maybe Asynchronous Barrier?