I found a convincing use case: stopping asynchronous activities
while paused. A follow up change will rename the stages and add
an example.
This reverts commit f9840b0963.
I'm not convinced the API is right. For exmaple, an event that
notifies a program when to save its state is both smaller and
might be sufficient.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Elias Naur