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Normally, when every call has a thread associated with it, the thread may get the buck and be in charge of sending all calls until its own call is done. When we introduced non-blocking calls, we had to add special handling of new non-blocking calls. This patch uses event loop to send data if there is no thread to get the buck so that any non-blocking calls left in the queue are properly sent without having to handle them specially. It also avoids adding even more cruft to client IO loop in the following patches. With this change in, non-blocking calls may see unpredictable delays in delivery when the client has no event loop registered. However, the only non-blocking calls we have are keepalives and we already require event loop for them, which makes this a non-issue until someone introduces new non-blocking calls. (cherry picked from commit 9e747e5c5079a5aead2f248fc22ff658bd0180be)
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>