Fix typo and add more information about CBD

The reason for the interleaved updated in CBD is important.

fix
This commit is contained in:
James Bardin 2020-07-01 16:50:11 -04:00
parent fb9c8261c5
commit dcf62ed378

View File

@ -191,9 +191,11 @@ digraph replacement {
-->
Here we can see clearly how `B` is updated after the creation of `A` and before
the destruction of `A`. To introduce another term, the prior resource `A` is
the destruction of the _deposed_ resource `A`. (The prior resource `A` is
sometimes referred to as "deposed" before it is destroyed, to disambiguate it
from the newly created `A`.
from the newly created `A`.) This ordering is important for resource that
"register" other resources, and require updating before the dependent resource
can be destroyed.
The transformation used to create these graphs is also where we use the extra
edges mentioned above connecting `B` to `A destroy`. The algorithm to change a
@ -255,9 +257,9 @@ digraph replacement {
}
-->
In order to resolve these cycles, and all resources that precede a resource
In order to resolve these cycles, all resources that precede a resource
with `create_before_destroy` must in turn be handled in the same manner.
Reversing the incoming edged to `A destroy` resolves the problem:
Reversing the incoming edges to `A destroy` resolves the problem:
![Correct create_before_destroy replacement](./images/replace_all_cbd.png)
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