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by cogman10
541 days ago
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> If you consider only a single thread in isolation its program order is always maintained even though compiler optimizations and hardware OOO execution actually execute the instructions in data order. It's not in most programming languages. That's actually a big part of the linked Wikipedia article is when and how program order is allowed to be modified. A great portion of the JVM memory model definition is dedicated to laying out exactly when and how read/write barriers are established and when/how ordering is enforced. Without any sort of barrier (in most cases) the JVM is fairly free to completely reorder program execution. |
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