On Tue, Nov 23, 2010 at 14:28, Chris Lalancette <clalance@xxxxxxxxxx> wrote:
> In terms of making this automatically happen during connection closing, I'm
> not entirely sure what we can (and should) do. I guess we could keep some sort
> of list of objects that "depend" on this connection object, and then during
> connection close free them all up. Does anyone know how the python bindings
> handle this?
python bindings work more or less the same way (see attachment).
So conclusion is, that all objects must be free() before closing connection.
It's not so intuitive, so maybe info about that should be somewhere in docs?
--
Pawel
In [1]: import libvirt, os, gc
In [2]:
In [3]: # testcase 1
In [4]: os.system("netstat -na|grep -v LISTENING |grep -c libvirt-sock")
0
Out[4]: 256
In [5]: c = libvirt.open('qemu:///system')
In [6]: os.system("netstat -na|grep -v LISTENING |grep -c libvirt-sock")
1
Out[6]: 0
In [7]: c.close()
Out[7]: 0
In [8]: os.system("netstat -na|grep -v LISTENING |grep -c libvirt-sock")
0
Out[8]: 256
In [9]:
In [10]: # work's OK (and ruby binding works the same way)
In [11]:
In [12]: # testcase 2
In [13]: c = libvirt.open('qemu:///system')
In [14]: os.system("netstat -na|grep -v LISTENING |grep -c libvirt-sock")
1
Out[14]: 0
In [15]: d = c.lookupByName("t1")
In [16]: d
Out[16]: <libvirt.virDomain instance at 0x95ef4cc>
In [17]: os.system("netstat -na|grep -v LISTENING |grep -c libvirt-sock")
1
Out[17]: 0
In [18]: c.close()
Out[18]: 1
In [19]: os.system("netstat -na|grep -v LISTENING |grep -c libvirt-sock")
1
Out[19]: 0
In [20]: c._o is None
Out[20]: True
In [21]: d.connect()._o is None
Out[21]: True
In [22]: d._conn._o is None
Out[22]: True
In [23]: d.create()
Out[23]: 0
In [24]: os.system("netstat -na|grep -v LISTENING |grep -c libvirt-sock")
1
Out[24]: 0
In [25]: d=None
In [26]: c.close()
libvir: error : invalid connection pointer in virConnectClose
---------------------------------------------------------------------------
libvirtError Traceback (most recent call last)
/home/imo/src/libvirt/python/<ipython console> in <module>()
/home/imo/src/libvirt/python/libvirt.pyc in close(self)
1330 ret = libvirtmod.virConnectClose(self._o)
1331 self._o = None
-> 1332 if ret == -1: raise libvirtError ('virConnectClose() failed', conn=self)
1333 return ret
1334
libvirtError: invalid connection pointer in virConnectClose
In [27]: c=None
In [28]: gc.collect()
Out[28]: 24
In [29]: os.system("netstat -na|grep -v LISTENING |grep -c libvirt-sock")
1
Out[29]: 0
--
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