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There is no point in adding the new interface at all if it has the same locking overhead. The <atomic.h> atomic_increment macro works on 64 bits when that is doable. For platforms where it doesn't work, you can use nonblocking synchronization a la seqcount. I don't think we have any good compile-time test for whether atomic_increment can handle 64 bits, but probably all but i386 can.
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