Re: [boost] Review Request: future library (Gaskill version)

From: Peter Dimov (pdimov_at_[hidden])
Date: 2008-04-13 08:54:08

> http://braddock.com/~braddock/future/

I have some more questions related to the callback support.

1. If thread A is blocked waiting for a future and thread B puts a value 
into the promise, is A unblocked right away, or do the callbacks complete 
first? In other words, is A guaranteed to observe the side effects of the 
callbacks?

2. What is the motivation for allowing more than one callback? This turns 
the promise into a signal. Usually we want to keep components separate and 
composable. Can't we just allow set_ready_handler and F* 
get_ready_handler<F> (a-la function<>::target)? The client can then install 
a signal.