Re: [Linaro-mm-sig] [RFC] dma-shared-buf: Add buffer sharing framework

On 08/27/2011 03:06 AM, Michael K. Edwards wrote:

Note that read/write can be given semantics that mmap + memory-mapped access doesn't provide. (Block until you get an I frame, then capture a scaled-down picture with no tearing artifacts, all in a single read() syscall ...)

Your use case of blocking on read() can be helpful only for a movie thumbnail in gallery. Otherwise, blocking on read(fd) in a userspace can result in frame loss during the encode kind of operation.

Regards, Subash

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