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Two phones at the same table pressed Join in the same moment, and the loser was told the quiz did not exist

Nobody who plays a quiz on PubTrivia has an account. They scan the code on their table, type a name, and they are in. That is deliberate, because the alternative is asking six people in a pub to…

  • Two phones attempted to join the same PubTrivia session simultaneously.
  • Race condition caused both phones to be denied entry to the quiz.
  • Advisory lock could prevent concurrent inserts in future quizzes.

An Android widget revelation

As a long-time appreciator of advanced Android efficiency, I love me a good widget. A well-designed Android widget can surface important info for you when and where you need it — without forcing you to find your way into the related app, poke around in its various screens and menus, and actively look for the info in question.

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