Re: [libvirt] Raising events for testing
Okay I have understand the use and mean of poll (pollfd...
bla...bla...bla...)
I have also discover that there is no Win32 equivalent which work with a
file descriptor (unix way...). Win32 has a select method that can be used to
emulate the poll function, but the fd_set structure is base on socket and
not on a file descriptor. Does anyone know a way to have a select or poll
function that works with file descriptor under windows ? (maybe via mingw, I
don't know)
Regards,
Arnaud
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From: <arnaud.champion(a)devatom.fr>
Sent: Friday, January 28, 2011 7:06 PM
To: "Daniel P. Berrange" <berrange(a)redhat.com>
Cc: <libvir-list(a)redhat.com>
Subject: Re: [libvirt] Raising events for testing
Okay, I'm trying to understand the Python implentation (I'm
not a python
expert but it seems to be quite readable once you've understand why there
is "self" everywhere :) ).
The thing I'm not able to understand is the call to the "poll" function as
this function doesn't exists in C# in any library at my knows... I'm not
fluent with this. Anyone can expliain what poll do ?
Regards
Arnaud
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From: <arnaud.champion(a)devatom.fr>
Sent: Friday, January 28, 2011 4:53 PM
To: "Daniel P. Berrange" <berrange(a)redhat.com>
Cc: <libvir-list(a)redhat.com>
Subject: Re: [libvirt] Raising events for testing
> Woohoo it will burn my brain :)
>
> --------------------------------------------------
> From: "Daniel P. Berrange" <berrange(a)redhat.com>
> Sent: Friday, January 28, 2011 4:24 PM
> To: <arnaud.champion(a)devatom.fr>
> Cc: <libvir-list(a)redhat.com>
> Subject: Re: [libvirt] Raising events for testing
>
>> On Fri, Jan 28, 2011 at 04:17:21PM +0100, arnaud.champion(a)devatom.fr
>> wrote:
>>> I suffer with the new callback API :)
>>>
>>> Does the new callback API need the EventRegisterImpl call ?
>>
>> Yes, virEventRegisterImpl is required in order to be able to
>> receive events.
>>
>>> Can anyone explain me the steps to install these callbacks ? I have
>>> a lot of difficulties to understand the polling process in the
>>> sample, does this polling is mandatory ?
>>
>> Events can arrive at the client socket from libvirtd at
>> any time. The poll() is used to watch for events arriving
>> and ensure immediate dispatch. If we didn't do this no
>> events would be seen until the next API call was made
>> which is sub-optimal.
>>
>> The file daemon/events.c shows a complete C implementation
>> of the event callbacks.
>>
>> The file examples/domain-events/events-python/domain-events.py
>> shows a pure Python implementation
>>
>> The C example program is a very *bad* demo of poll() so ignore
>> that and look at daemon/events.c instead.
>>
>> Daniel
>>
>
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