On Tue, Aug 3, 2010 at 10:43 AM, Soren Hansen <[email protected]> wrote:
> On Tue, Aug 03, 2010 at 10:37:04AM -0400, Kapil Thangavelu wrote: > >> Using standard Twisted, no. I doubt it's possible. You need threads > >> or coroutines or something to pull that off and Twisted uses neither. > > Well its possible, but its not useful, as it will still hang the > > process. > > How can you block waiting for a deferred to fire? > > Sorry i missed in the context that it was on a deferred. As you said, there isn't a way to do that in twisted. > >>> Perhaps we can clarify the Twisted vs Eventlet discussion: would > >>> Eventlet solve this particular problem? > >> The inlineCallbacks thing? Yes. The libvirt thing? Not as far as I > >> know. eventlet has this patching mechanism, but as I understand it, > >> it relies on the particular module using Python's socket module to > >> work, which python-libvirt doesn't, AFAIK. > > making the libvirt sync call into async for the purposes of twisted > > should be easy enough.. > > Sure. The question was about eventlet. > > i think eventlet has the same functionality (defer call to thread).. ala http://bitbucket.org/lindenlab/eventlet-trunk/src/tip/eventlet/tpool.py > > def threaded_invoke_sync_hang_api(on_result, args): > > result = libvirt.get_info(args) > > reactor.callFromThread(on_result, result) > > > > def get_libvirt_info(*args): > > d = Deferred() > > reactor.deferToThread(threaded_invoke_sync_hang_api, args) > > return d > > Why not just: > > def get_libvirt_info(*args): > return reactor.deferToThread(libvirt.get_info, args) > doh.. yup. that's much better. i was looking at the signature of reactor.callInThread which didn't have a return. cheers, Kapil
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