Re: [Qemu-devel] [PATCH/RFC 0/7] Screendump to UNIX socket & in PNG format

[Stefan Hajnoczi]

On Tue, Mar 13, 2012 at 1:17 PM, Gerd Hoffmann <address@hidden> wrote:
>  Hi,
>
>> If you want to do it as part of the QEMU codebase then a thread is
>> probably the best way - it avoids the troubles of forking a
>> multithreaded program and letting go of resources (guest memory, file
>> descriptors) that aren't needed across fork.
>
> That pretty much requires async monitor command support though, so the
> iothread can continue driving guest i/o while the new worker thread
> scales/compresses/writes the screendump.

The most practical first step would be simply sending the ppm over a
socket from ppm_save().  The 'screendump' command today already blocks
so no new badness is being added.  There would be no threads or fancy
image encoding.

Stefan