[RFC] Activate all the owners of a single name

Yang Chengwei chengwei.yang at intel.com
Tue Jul 2 00:36:02 PDT 2013

Filed a bug to track this RFC:


On Tue, Jul 02, 2013 at 03:32:54PM +0800, Yang Chengwei wrote:
> Hi List,
> Status of art
> =============
> As defined by DBus Specification
> http://dbus.freedesktop.org/doc/dbus-specification.html
> {quote}
> [FIXME what happens if two .service files offer the same service; what
> kind of error is reported, should we have a way for the client to choose
> one?]
> {/quote}
> As implemented by reference dbus-daemon.
> It load service file and register names in hash table, no duplicate
> entry allowed, so if there are more than one .service file own a name,
> the first returend by readdir(3) will win and be activated on demand.
> That is somehow undefined which .service file will win because
> readdir(3) doesn't ensure return dirent in any kind of order.
> Meanwhile, we already has built-in support for multiple owners of a
> name, that is owner queue. Also fully API support. So all the dbus
> service providers should learned how to handle different situations
> happened when acquiring a name.
> Proposal to activate multiple owners of a name
> =============
> It's straight forward that we can do the similar thing when activating
> service by name. Say there are N .service file declare that they own a
> name, if none of them is running when a request coming, we should
> activate them all
>     * in random order?
> 	* in defined order? How? Can be defined by user?
> To me, I think activate them in random order is reasonable, that's just
> the same case when a service starting, it doesn't known if its
> requesting name already owned by others. All the service providers
> should already learned how to handle these situations through libdbus
> API.
> --
> Thanks,
> Chengwei

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