[vlc-devel] request for review: add callback variable to interfaces to know when to shutdown

Rémi Denis-Courmont rem at videolan.org
Sun Oct 12 21:00:13 CEST 2008

Le dimanche 12 octobre 2008 21:21:52 Ilkka Ollakka, vous avez écrit :
> Attached patch is one way to overcome interface for looping and checking
> when it should die. I would appreciate if courmisch/pdherbemont/j-b/
> someone working with interface and/or core could take a look and comment
> if something is totally wrong (like causing infinite loop/small black
> holes), or if this approach is some otherway not quite right.

IMHO, the interface should simply exit when Close() is called. It does not 
need yet another abuse of the variables subsystem. The interface can start 
its thread(s) manually from Open(). This should anyway be done if the 
interface needs to wait for its thread initialization. I believe Qt4 should 
do that, to ensure that dialogs and vout windows are not invoked while the 
interface is still initializing.

Inside Close(), the interface can notify its thread in any convenient 
interface-specific way. For instance, a Qt4 signal can be emitted.

An alternative is to not pre-empt thread cancellation. intf_Destroy() will 
cancel the "pf_run" thread. A few simple interfaces are leveraging this 
already in trunk.

Rémi Denis-Courmont

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