Re: [Libff-devel] Re: [Vegastrike-devel] commit: improved force feedback

[Johann D. <de...@if...>]

Alexander Rawass wrote:
> Hi,
> 
> 
> On Monday 18 March 2002 09:30, you wrote:
> 
>>>Maybe it's better to leave it off, so that it can be used free?
>>>
>>It's not really my choice. There are I-Force commands to enable and
>>disable force feedback. The first application to open /dev/input/eventX
>>will enable force feedback, the last application to release it will
>>disable ff. It's not as if I manually created a spring effect. The
>>spring is created by the device itself.
>>
> 
> If FF is disabled, this spring effect comes up?
> 

Yes.

> 
>>>>>What do I have to do in the destructor to release the joystick?
>>>>>
>>>>Nothing at all.
>>>>
>>>Can I say something like 'delete effect nr. 2?' or 'clear all effects' or
>>>'reset stick'?
>>>
>>You can delete effects individually, but only those effects created by
>>your process.
>>There is no clear all effects or reset stick command. Those are
>>incompatible with the idea of concurrent access by several applications,
>>and would be merely a
>>bad work-around a bug. Bugs should not be worked around, but fixed.
>>
> 
> Then, you should verify if the process that own those effects is still 
> running.
> 
> Cause if VS crashes, the 15 effects I uploaded are still there - and if I 
> start it new, I can only upload 5 effects then.

IF VS dies, the system closes all its file descriptors. This is when 
effects are cleared from the device's memory. Or at least that's what I 
assumed the system would do.
Are you sure VS isn't still running after the crash ?

> 
> Maybe check for all effects on the device if the process is still running, 
> anytime an applications wants to upload an effect and fails?
> 

I would rather avoid that solution if possible.

-- 
Johann Deneux

 
______________________________________________________________________________
ifrance.com, l'email gratuit le plus complet de l'Internet !
vos emails depuis un navigateur, en POP3, sur Minitel, sur le WAP...
http://www.ifrance.com/_reloc/email.emailif