dongle0396 2013-08-06 02:55
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如何在Go中映射X切片?

I'm trying to use launchpad.net/gommap to memory map an array of int32, and some other custom struct types. I strictly want to use them where they are in the mapped region. The gommap.Mmap type is []byte, how can I make sections of that available as slices of some other type?

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  • dongxun1244 2013-08-06 05:36
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    You'd have to use the unsafe package.

    func mapInt32(fd uintptr, prot gommap.ProtFlags, flags gommap.MapFlags) ([]int32, error) {
        mmap, err := gommap.Map(fd, prot, flags)
        if err != nil {
            return nil, err
        }
        header := (*reflect.SliceHeader)(unsafe.Pointer(&mmap))
        // account for the size different between byte and int32
        header.Len /= 4
        header.Cap = header.Len
        return *(*[]int32)(unsafe.Pointer(header)), nil
    }
    

    You may want to make a way to unmap the memory when you're done with it. You could do that by unsafely casting your []int32 back to a gommap.MMap in a similar way.

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