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Nikolay Shirokovskiy f647a4b8dd qemu: fix one more race on undefining and create
[1] closes gap in virDomainObjListRemove so that concurrent thread can
not step in and obtain the domain while domain is temporary unlocked. But
there is another gap exist:

thread B - executes create API
thread C - executes undefine API

- thread A executes some job on domain
- threads B and C obtains domain from list and wait for job condition
- thread A finishes its job and C grabs job condition, removes domain
  from list and finishes
- thread B grabs job condition and start the domain, unfortunately
  is not in the list already

[1] commit c7d1c139ca3402e875002753952e80ce8054374e
Author: Martin Kletzander <mkletzan@redhat.com>
Date:   Thu Dec 11 11:14:08 2014 +0100

    qemu: avoid rare race when undefining domain

Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@openvz.org>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
2022-04-13 17:48:46 +03:00
2019-05-31 17:54:28 +02:00
2022-04-07 16:19:42 +02:00
2022-04-08 10:27:02 +02:00
2019-09-06 12:47:46 +02:00
2022-03-17 14:33:12 +01:00
2020-01-16 13:04:11 +00:00
2020-08-03 09:26:48 +02:00
2019-10-18 17:32:52 +02:00
2015-06-16 13:46:20 +02:00
2022-04-04 10:36:30 +02:00
2020-08-03 15:08:28 +02:00

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Libvirt API for virtualization

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.

For some of these hypervisors, it provides a stateful management daemon which runs on the virtualization host allowing access to the API both by non-privileged local users and remote users.

Layered packages provide bindings of the libvirt C API into other languages including Python, Perl, PHP, Go, Java, OCaml, as well as mappings into object systems such as GObject, CIM and SNMP.

Further information about the libvirt project can be found on the website:

https://libvirt.org

License

The libvirt C API is distributed under the terms of GNU Lesser General Public License, version 2.1 (or later). Some parts of the code that are not part of the C library may have the more restrictive GNU General Public License, version 2.0 (or later). See the files COPYING.LESSER and COPYING for full license terms & conditions.

Installation

Instructions on building and installing libvirt can be found on the website:

https://libvirt.org/compiling.html

Contributing

The libvirt project welcomes contributions in many ways. For most components the best way to contribute is to send patches to the primary development mailing list. Further guidance on this can be found on the website:

https://libvirt.org/contribute.html

Contact

The libvirt project has two primary mailing lists:

Further details on contacting the project are available on the website:

https://libvirt.org/contact.html

Description
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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