Re: [libdc] Writable DMA buffer

[David M. <dav...@gm...>]

I guess you are talking about allowing the application to use the mmap
region for in-place image processing operations while the buffer is
dequeued?  I don't see anything wrong with that.

Go ahead and add PROT_WRITE and test it out, and if you are happy with it,
it sounds good to me.

-David

On Sun, Aug 21, 2011 at 12:37 AM, Damien Douxchamps <dd...@do...>wrote:

> Hi,
>
> After a long inactive period I was finally looking at libdc's code today
> and noticed that the DMA buffer allocation in juju uses read-only flag
> PROT_READ. In the legacy 1394 code, both read and write are allowed,
> which can avoid an unnecessary memcpy() operation.
>
> Is there any problem in changing the PROT_READ to (PROT_READ |
> PROT_WRITE) ?
>
> Damien
>
> --
> Damien 高原 Douxchamps   http://damien.douxchamps.net/
>
>
>
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