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This is fixing a bug where o2-sim hangs when the hit merger starts after the sim workers have finished. A worker exited 10 s after its last chunk, and the hits still queued for the merger were lost with it, so the merger waited forever for data. Workers now stay alive until the o2-sim driver terminates them, or until their parent is gone. This was seen with `--noGeant` event generation in anchored MC, where the worker finishes within seconds. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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This is fixing a bug where o2-sim hangs when the hit merger starts after the sim workers have finished. A worker exited 10 s after its last chunk, and the hits still queued for the merger were lost with it, so the merger waited forever for data. Workers now stay alive until the o2-sim driver terminates them, or until their parent is gone. This was seen with
--noGeantevent generation in anchored MC, where the worker finishes within seconds.