makecontext/swapcontex doesn't have automatically growing stack (opposed to their WinAPI equivalents). Yes, you can do this, too, I know. But if you don't want

makecontext/swapcontex doesn't have automatically growing stack (opposed to their WinAPI equivalents). Yes, you can do this, too, I know. But if you don't want to go into the gory details here you either have a alloc a "large enough" buffer for your coroutines thus probably wasting memory.