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There are a few issues with the current virAtomic APIs - They require use of a virAtomicInt struct instead of a plain int type - Several of the methods do not implement memory barriers - The methods do not implement compiler re-ordering barriers - There is no Win32 native impl The GLib library has a nice LGPLv2+ licensed impl of atomic ops that works with GCC, Win32, or pthreads.h that addresses all these problems. The main downside to their code is that the pthreads impl uses a single global mutex, instead of a per-variable mutex. Given that it does have a Win32 impl though, we don't expect anyone to seriously use the pthread.h impl, so this downside is not significant. * .gitignore: Ignore test case * configure.ac: Check for which atomic ops impl to use * src/Makefile.am: Add viratomic.c * src/nwfilter/nwfilter_dhcpsnoop.c: Switch to new atomic ops APIs and plain int datatype * src/util/viratomic.h: inline impls of all atomic ops for GCC, Win32 and pthreads * src/util/viratomic.c: Global pthreads mutex for atomic ops * tests/viratomictest.c: Test validate to validate safety of atomic ops. Signed-off-by: Daniel P. Berrange <berrange@redhat.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>