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How should I implement these 64-bit interlocked functions on WinXP? Of course I can use full mutex, but I think it’s needlessly heavyweight for this task. There must be some better way.
You shouldn’t. This is much more complex than you think.
If you insist, your best bet is to use a critical section to make sure you get the barriers right.
If you really think a critical section is too heavy weight, read up on memory barriers