Isn't it waiting to execute anything that follows after a twait code block?
If so, then it is blocking. Otherwise, how do you manage to let other code be executed, except the code you don't want to be executed until all functions in the twait block have returned?
The would need to be a callback attached to the twait block, but there isn't. So it's blocking.
Because that is it's purpose, to block further executing until all data from the non-blocking functions have returned.
