Alignment of addresses returned by SharedMemory::Map()

[Dale Curtis]

Can it be assumed (CHECK()'d) that addresses returned by SharedMemory::Map() are always at least 16-byte aligned? My understanding is they are aligned to the platform page boundary, which in modern times is >> 16.

Thanks in advance,

- dale

[John Bates]

That's my understanding as well. It also seems like a reasonable
guarantee for the Map API to provide. How about adding an expectation
to shared_memory_unittest.cc somewhere and run some try bots? If all
goes well you might add a note to the Map comments about minimum
alignment.

-John

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[Dale Curtis]

Thanks John, to close the loop: I landed http://crrev.com/152218 which advertises a minimum alignment of 32-bytes. Per jar, it's still recommended callers counting on this use a CHECK() though.

- dale