Why does the closed status of channel need a uint32?

[Paul Zhang]

For the channel structure:

type hchan struct {

    qcount   uint

    dataqsiz uint

    buf      unsafe.Pointer

    elemsize uint16

    closed   uint32

    elemtype *_type

    sendx    uint

    recvx    uint

    recvq    waitq

    sendq    waitq

    lock mutex

}

Why does the closed need a uint32? I am reading the code and found that it seems to be only 0 or 1.

[Axel Wagner]

Because there are no atomic operations for smaller integers, I assume :)

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