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If available, let libxl handle reaping any children it creates by specifying libxl_sigchld_owner_libxl_always_selective_reap. This feature was added to improve subprocess handling in libxl when used in an application that does not install a SIGCHLD handler like libvirt http://lists.xen.org/archives/html/xen-devel/2014-01/msg01555.html Prior to this patch, it is possible to hit asserts in libxl when reaping subprocesses, particularly during simultaneous operations on multiple domains. With this patch, and the corresponding changes to libxl, I no longer see the asserts. Note that the libxl changes will be included in Xen 4.4.0. Previous Xen versions will be susceptible to hitting the asserts even with this patch applied to the libvirt libxl driver. Signed-off-by: Jim Fehlig <jfehlig@suse.com>
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>