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Android 17 introduces DeliQueue, a lock-free MessageQueue implementation that eliminates lock contention on the UI thread. The new architecture uses a Treiber stack for lock-free message insertion and a min-heap for single-threaded processing, replacing the legacy synchronized priority queue. This change delivers 4% fewer missed frames in apps, 7.7% improvement in System UI interactions, and 9.1% faster app startup times at the 95th percentile. The post details the technical implementation including atomic operations, tombstoning for safe removal, branchless programming optimizations, and analysis techniques using Perfetto traces.

Under the hood: Android 17’s lock-free MessageQueue