Shulou(Shulou.com)06/03 Report--

[phenomenon]: the guessing system stipulates that a user can only get free chips once a day.

Repeat the problem with the user

[cause analysis]: repeated claim occurs because there is no thread and lock at the beginning, and it is easy to repeat it in the case of multiple concurrency.

[solution]: a synchronization mechanism is added to the corresponding actions to prevent repetition.

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