From: Ralf Jung <post@ralfj.de>
Date: Mon, 10 Dec 2018 16:15:24 +0000 (+0100)
Subject: calrify unfreeze-on-write
X-Git-Url: https://git.ralfj.de/web.git/commitdiff_plain/b62b5d4e69947e31f642e53b1eddf3f92109ce98?ds=inline;hp=2e4cf526c684c25b6483e372c2ac991f837efc47

calrify unfreeze-on-write
---

diff --git a/personal/_posts/2018-11-16-stacked-borrows-implementation.md b/personal/_posts/2018-11-16-stacked-borrows-implementation.md
index c1c0274..df60719 100644
--- a/personal/_posts/2018-11-16-stacked-borrows-implementation.md
+++ b/personal/_posts/2018-11-16-stacked-borrows-implementation.md
@@ -375,8 +375,9 @@ perform the following operations on all locations affected by the access:
 
 1. If the location is frozen and this is a read access, nothing happens (even
    if the tag is `Uniq`).
-2. Unfreeze the location (set `frozen_since` to `None`).  Either the location is
-   already unfrozen, or this is a write.
+2. Otherwise, if this is a write access, unfreeze the location (set
+   `frozen_since` to `None`).  (If this is a read access and we come here, the
+   location is already unfrozen.)
 3. Pop the stack until the top item matches the tag of the pointer.
     - A `Uniq` item matches a `Uniq` tag with the same ID.
     - A `Shr` item matches any `Shr` tag (with or without timestamp).