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Listing 7.18 / 7.19 / 7.20 - Potential Data Race #38

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Given the following reading material here and here, please consider upgrading the memory-ordering of our .compare_exchange_strong() operations from...

std::memory_order_acquire

...to...

std::memory_order_acq_rel

...to ensure all accesses to ptr happen before its deletion.


Attached are examples of before and after results from Godbolt using thread sanitiser.


Thank you to Nate Eldridge for the great explanation and testing.

- consider upgrading to std::memory_order_acq_rel to ensure all accesses to ptr_ happen before its deletion
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