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Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
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Daniel P. Berrange 0c9fd4cfe9 Rewrite virAtomic APIs using GLib's atomic ops code 
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>
2012-08-02 11:50:59 +01:00
.gnulib@dbd914496c build: update to latest gnulib, for secure tarball 2012-07-26 07:50:59 -06:00
build-aux Remove tabs from all perl files & enforce this 2012-07-30 13:09:57 +01:00
daemon Remove manual one-shot global initializers 2012-08-02 11:50:46 +01:00
docs domain_conf: Add USB controler model "none" 2012-08-02 11:54:14 +02:00
examples Extend events demo to show close callbacks in use 2012-07-30 12:35:07 +01:00
gnulib build: fix fresh checkout on RHEL5 2012-04-19 17:11:43 -06:00
include parallels: add driver skeleton 2012-08-01 11:44:26 +08:00
m4 maint: make it easier to copy FORTIFY_SOURCE snippet 2012-06-07 10:52:37 -06:00
po parallels: add storage driver 2012-08-01 11:48:01 +08:00
python python: Don't generate bodies for close callback functions 2012-07-30 15:38:07 +02:00
src Rewrite virAtomic APIs using GLib's atomic ops code 2012-08-02 11:50:59 +01:00
tests Rewrite virAtomic APIs using GLib's atomic ops code 2012-08-02 11:50:59 +01:00
tools build: distribute virsh related source files 2012-07-31 14:31:43 +08:00
.dir-locals.el maint: let emacs avoid tabs in rng files 2011-08-13 08:56:26 -06:00
.gitignore Rewrite virAtomic APIs using GLib's atomic ops code 2012-08-02 11:50:59 +01:00
.gitmodules make .gnulib a submodule 2009-07-08 16:17:51 +02:00
.mailmap maint: consolidate AUTHOR listings for Gerd von Egidy 2012-08-01 17:29:46 -06:00
AUTHORS maint: consolidate AUTHOR listings for Gerd von Egidy 2012-08-01 17:29:46 -06:00
autobuild.sh Switch automated builds to use Mingw64 toolchain instead of Mingw32 2012-06-25 10:41:10 +01:00
autogen.sh Allow NOCONFIGURE=1 to make autogen.sh skip ./configure 2012-06-25 10:41:10 +01:00
bootstrap maint: regenerate bootstrap 2012-07-27 09:34:04 -06:00
bootstrap.conf maint: avoid regression on copyright listings 2012-07-27 07:42:34 -06:00
cfg.mk Remove tabs from all perl files & enforce this 2012-07-30 13:09:57 +01:00
ChangeLog-old virterror.c: Fix several spelling mistakes 2012-02-03 11:32:51 -07:00
configure.ac Rewrite virAtomic APIs using GLib's atomic ops code 2012-08-02 11:50:59 +01:00
COPYING.LIB remove all trailing blank lines 2009-07-16 15:06:42 +02:00
HACKING docs: Improve patch submission guidelines 2012-07-16 11:05:12 +02:00
libvirt.pc.in build: silence warning from autoconf 2012-05-30 09:22:02 -06:00
libvirt.spec.in spec: Remove extra () with return statement 2012-08-01 13:09:57 +02:00
Makefile.am Switch automated builds to use Mingw64 toolchain instead of Mingw32 2012-06-25 10:41:10 +01:00
Makefile.nonreentrant Ban use of all inet_* functions 2010-10-22 11:59:23 +01:00
mingw-libvirt.spec.in parallels: add driver skeleton 2012-08-01 11:44:26 +08:00
README Correct typos in the documentation (Atsushi SAKAI) 2008-01-24 10:15:13 +00:00
README-hacking maint: relax git minimum version 2010-02-24 14:29:27 -05:00
TODO Update todo list file to point at bugzilla/website 2010-10-13 16:45:26 +01:00

README 

         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>