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C++ 11 Atomic

SSE2 extensions introduce two new fence instructions (LFENCE and MFENCE) as companions to the SFENCE instruction introduced with SSE extensions. The LFENCE instruction establishes a memory fence for loads. It guarantees ordering between two loads and prevents speculative loads from passing the load fence (that is, no speculative loads are allowed until all loads specified before the load fence have been carried out). The MFENCE instruction establishes a memory fence for both loads and stores. The processor ensures that no load or store after MFENCE will become globally visible until all loads and stores before MFENCE are globally visible.1 Note that the sequences LFENCE;SFENCE and SFENCE;LFENCE are not equivalent to MFENCE because neither ensures that older stores are globally observed prior to younger loads.

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