On 27 February 2017 at 12:29, Esteban Lorenzano <estebanlm@gmail.com> wrote:

Hi,

the problem wit Ronie��s fix is that (as he says) you are copying another time the surface, before passing it to the VM (who makes yet-another-copy) so this is not optimal�� and you can see it when running the Tiger demo: there are a lot of pauses.
So I would prefer the other approach he suggests:

Form subclass: #AthensCairoSurfaceForm
�� instanceVariableNames: 'surface'
�� classVariableNames: ''
�� package: 'Athens-Cairo'

AthensCairoSurfaceForm>>surface
�� ^ surface

AthensCairoSurfaceForm>>surface: anObject
�� surface := anObject

AthensCairoSurface>>asForm
�� "create a form and copy an image data there"
�� self checkSession.
�� self flush.
�� ^ (AthensCairoSurfaceForm extent: (self width@self height) depth: 32 bits: id)
�� surface: self;
�� yourself

that seems to work. Can you try and see?

Btw, remember the culprit there , that you must have extra word in trailing buffer space,

this is because bit-blt using read-ahead . Which is OK for objects located in object memory,

since there are always something past the last object (unallocated space),

but not so ok for buffers allocated by malloc (such as cairo surface bitmap), and so,

if you read even a single byte past it, you get protection fault.

��

Esteban

> On 24 Feb 2017, at 15:47, stepharong <stepharong@free.fr> wrote:
>
> Hi alex
>
> can you try the fix of ronie and let us know if it makes roassal more stable?
>
> Stef
>
>> Dear Alexander,
>>
>> Sine the new FFI of Pharo, using Athens has become unreliable. This is a pity, but fixing this is not trivial at all (we have been trying for years).
>>
>> What exactly are you doing with Athens?
>>
>> Alexandre
>>
>>
>>> On Feb 22, 2017, at 12:55 AM, Alexander Samoylovich <samoylovich@gmail.com> wrote:
>>>
>>> Hello
>>>
>>> I am writing graphic demo programs using Athens on Mac Sierra.
>>> Time by time Pharo VM crashes. Programs not using Athens work reliably.
>>> I believe the behavior is reproducible.
>>> How should I report a bug?
>>>
>>> Alex
>>
>
>
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>

Best regards,
Igor Stasenko.