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A comment on New release of Memory Pool System Garbage Collector. Parent comment

Re:New release of Memory Pool System Garbage Collector by sedachv on Saturday September 15, 2012 @08:12PM (#4527733)
> The MPS approach that's deployed commercially is to use an unfashionable hardware read barrier

For those of us too lazy to dive into the code, can you say what this read barrier is?

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