commit | eb702ee4af0cfd1abd288c9ef3793922a69f4b11 | [log] [tgz] |
---|---|---|
author | Chuck Jazdzewski <chuckj@google.com> | Fri Aug 20 16:58:26 2021 -0700 |
committer | Chuck Jazdzewski <chuckj@google.com> | Mon Aug 23 18:01:12 2021 -0700 |
tree | 2fa38d7ee33483c7fccb435dbd40c7ce9e2212e5 | |
parent | 3bcfc0c17897559085e1130a692bc4851d319306 [diff] |
Fix concurrent behavior of the state list and map Prior to this change concurrent access to the result return by `mutableStateListOf` and `mutableStateMapOf` had undefined behavior when written to in the global snapshot without external synchronization. The values for the elements in the collection not directly affected by the change could appear to revert to a previous value in some cases as an older copy of the list or map was used for the change and result of other changes were discarded. With this change, all changes are guaranteed to become part of the state of the list or map by retrying the operation until the change does not conflict with other concurrent writes. The repeated loop does not ensure progress and it might cause colliding operations to take longer on the colliding threads. Use of a mutable snapshot can be used to ensure there is no looping and synchronized access to the list or map can be used to ensure progress. This change does not ensure changes in the global snapshot are read/write consistent. Read/write consistency still requires a snapshot. However, operations that do not require read/write consistency, such as the example in b/195886093, will now produce a consistent result. Fixes: b/195886093 Test: ./gradlew :compose:r:r:tDUT Change-Id: Id2384eb415ccc4d4c6abd709080f96ac6b5c6eff
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