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iraxef

script context and nested calls (PushState/PopState)

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iraxef    451

What are the expected uses of PushState/PopState on a script context?

 

One gotcha I'm thinking of is what if the script function you called via a nested-context-call suspends itself.. would that not also suspend the execution of the 'outer' function (which might be unexpected/undesirable)?

 

If you call the same script function (as the one that reached out to C++ and got it to make a nested call back into script).. it will have a different local stack/state than the 'outer' script function, due to the nested call, right?

 

Thank you very much.

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WitchLord    4678

The use for Push/PopState is exactly how you imagine it. When a script calls an application function that needs to call another script function you can reuse the active context rather than create a new one. After calling PushState() the context can be used exactly like a newly created context, i.e. you'd call Prepare(), SetArg...() and Execute() to make a call to the new function.

 

When the context is suspended only the inner-most execution is suspended. The outer execution will only be suspended if the application first calls PopState() and then Suspend() again.

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WitchLord    4678

The outer execution will only continue once the PopState() is called.

 

Remember that normally Push/PopState() is called from a function called by the context, so the application call stack will look something like this:

 

application::DoProcessing
  asCScriptContext::Execute                    <-- outer execution
    application::RegisteredFunction          <-- application registered function that called PushState
      asCScriptContext::Execute                <-- inner execution

 

The outer execution can only continue after the application registered function returns.

 

Regards,

Andreas

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