VM (callback+variables) changes

> Hi Folks -
>
> Attached my proposed changes for both, the variable tracking as well as
> the callback support. I'll respond in the individual threads about more
> specific issues; let's leave this one to discuss the more "mechanical"
> issues if there are any. Included files:
>
> - ExtraGCRoots.cs: The change set for tracking variables in plugins
> - Callbacks.cs: The change set for VM callback support
> - ExampleCallbacks.cs: An example plugin making use of both of the above
> features
> - sqVirtualMachine[.h|.c]: The (updated) VM proxy
>
> If you install all of the above and build a complete VM you should be
> able to execute the ExampleCallbackPlugin's exampleCallback and
> successfully compute 3+4 using a callback.
>
> Let me know if you have any problems.
>
> Cheers,
>   - Andreas
>
>

> Andreas,
>
> This looks great. I tried this out with a fresh 3.9-7033 image and
> latest Win32 VM source, and your example worked as advertised. It also
> works fine as a replacement for my wxSqueak setjmp/longjmp calls, and
> removes the need for an extra semaphore on the calling process. Thanks!
>
> .. Rob
>
>
> Andreas Raab wrote:
>> Hi Folks -
>>
>> Attached my proposed changes for both, the variable tracking as well
>> as the callback support. I'll respond in the individual threads about
>> more specific issues; let's leave this one to discuss the more
>> "mechanical" issues if there are any. Included files:
>>
>> - ExtraGCRoots.cs: The change set for tracking variables in plugins
>> - Callbacks.cs: The change set for VM callback support
>> - ExampleCallbacks.cs: An example plugin making use of both of the
>> above features
>> - sqVirtualMachine[.h|.c]: The (updated) VM proxy
>>
>> If you install all of the above and build a complete VM you should be
>> able to execute the ExampleCallbackPlugin's exampleCallback and
>> successfully compute 3+4 using a callback.
>>
>> Let me know if you have any problems.
>>
>> Cheers,
>>   - Andreas
>>
>>
>
>
>

> Hi Rob -
>
> Good to hear it works. There are two things that bothers me slightly and
> I'd like to get some feedback from someone who's been in that area
> before: First, the callback identifier. While it seems a good safeguard
> at first it gets into ones way pretty quickly (like in the example
> plugin where the absence of callback-id management makes it impossible
> to have more than one callback). So... do you think it's worthwhile to
> keep it and force people to go through the hoops of maintaining it?
>
> Second, I'm somewhat unhappy about the management of the suspended
> processs. I am wondering if we shouldn't use a semaphore in the
> splObjects for this purpose and link/unlink properly. This has the
> disadvantage that some image-side changes are required but it might be
> worth it for better house-keeping.
>
> Comments welcome!
>   - Andreas
>
> Rob Gayvert wrote:
>
>> Andreas,
>>
>> This looks great. I tried this out with a fresh 3.9-7033 image and
>> latest Win32 VM source, and your example worked as advertised. It also
>> works fine as a replacement for my wxSqueak setjmp/longjmp calls, and
>> removes the need for an extra semaphore on the calling process. Thanks!
>>
>> .. Rob
>>
>>
>> Andreas Raab wrote:
>>
>>> Hi Folks -
>>>
>>> Attached my proposed changes for both, the variable tracking as well
>>> as the callback support. I'll respond in the individual threads about
>>> more specific issues; let's leave this one to discuss the more
>>> "mechanical" issues if there are any. Included files:
>>>
>>> - ExtraGCRoots.cs: The change set for tracking variables in plugins
>>> - Callbacks.cs: The change set for VM callback support
>>> - ExampleCallbacks.cs: An example plugin making use of both of the
>>> above features
>>> - sqVirtualMachine[.h|.c]: The (updated) VM proxy
>>>
>>> If you install all of the above and build a complete VM you should be
>>> able to execute the ExampleCallbackPlugin's exampleCallback and
>>> successfully compute 3+4 using a callback.
>>>
>>> Let me know if you have any problems.
>>>
>>> Cheers,
>>>   - Andreas
>>>
>>>
>>
>>
>>
>