[getdns-api] PHP Language Bindings and Async Event Management

[Willem Toorop]

Hi Scott,

I think this gets a little bit too much into implementation details for
the API list, so I'm going to answer this on the users at getdnsapi.net list.

The ones interested in the answer can subscribe to it, or read the
archives here: https://getdnsapi.net/mailman/listinfo/users

-- Willem

Op 21-04-15 om 13:30 schreef Hollenbeck, Scott:
>> -----Original Message-----
>> From: getdns-api [mailto:getdns-api-bounces at vpnc.org] On Behalf Of
>> Goyal, Neel
>> Sent: Monday, April 20, 2015 1:58 PM
>> To: Melinda Shore; getdns-api at vpnc.org
>> Subject: Re: [getdns-api] PHP Language Bindings and Async Event
>> Management
>>
>> Freeing the context should not clean up the event base.  If the event
>> base
>> is shared between other async libs and they are adding to that event
>> base,
>> a context destroy should not prevent those libs from still functioning.
>> The context_destroy makes sure the context is detached from the
>> event_base, but any structures specific to libevent are not cleaned up.
>> Much like the user has to create the lib event base explicitly and then
>> attach it to getdns, the user has to free it.
> 
> Neel, in a note I sent to this list last week (BTW, it looks like recent notes aren't being archived) I described a challenge I found in trying to use the PHP libevent extension with getdns. I can create an event base, but I don't see an easy way to attach that to a context. Come on down if you have a chance and I'll walk you through what I found.
> 
> So, I took a look at how I could use the functions provided by the getdns libevent extension. Looking at the code in context.c, I found that getdns_context_create() calls getdns_context_create_with_memory_functions(), which calls getdns_context_create_with_extended_memory_functions(). That function calls getdns_mini_event_init() (in file libmini_event.c), which creates an event base and sets an event loop. That base is cleaned up when calling getdns_context_destroy(), which calls context->extension->vmt->cleanup(context->extension).
> 
> Scott
> 
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> 

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