[Qt-interest] qsharedmemory after crash.

[David Forstenlechner]

That would be the logical thing to do,
but QSharedMemory does not seem to provide the functions
to allow the deletion of an existing shared memory segment.

- DavidF

Am 29.07.2011 18:53, schrieb Tom Green:
>
> The simple answer is that when you call QSharedMemory::create, if it returns false, delete the old segment, and then re-create it.
>
> Tom
>
> ----- Original Message -----
> From: "David Forstenlechner" <dforsten at newtek.com>
> To: qt-interest at trolltech.com
> Sent: Friday, July 29, 2011 4:31:25 AM
> Subject: Re: [Qt-interest] qsharedmemory after crash.
>
> I am running into the same problem,
> there does not seem to be a way to destroy memory allocated by
> QSharedMemory after
> an unclean shutdown of a process attached to it, making this nice cross
> platform abstraction
> dubious in production code, you have to descend to platform specific
> APIs in any case.
> Its good for quick prototyping though.
>
> A "destroy()" function like in QtSharedMemory would be very helpful.
>
> - DavidF
>
> Am 05.09.2008 18:44, schrieb bkn at ithryn.net:
>> Hi All,
>> I have found qsharedmemory to be very useful. Sadly, i'm not a perfect
>> programmer and my application will crash. This leaves memory segments
>> created by qsharedmemory to live beyond the application crash. The next
>> time i run the application it will attach to the previously allocated
>> memory segment from before the crash. This behavior is described in the Qt
>> Documentation. 
>>
>> Is there a way i can tell Qt (or linux) to release that memory segment so
>> when i run my application after a crash it will attach to a clean and
>> perhaps differently sized memory segment? Otherwise it seems i have to quit
>> KDE or even restart the computer to start with fresh memory segments. I
>> suppose one way to do this is to create a qsharedmemory instance with a
>> unique name every time the application is run, but i was hoping there is a
>> better way since i use several instances of qsharedmemory segments.
>>
>> Thanks for you help, cheers, 
>>  - b
>>
>>
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>>
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-- 
*3D Software Architect*
LightWave10


    count on it

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