New acceleration architecture

[Keith Packard]

On Wed, 2005-06-29 at 22:29 +0200, Thomas Winischhofer wrote:

> But please... I very much hope this isn't meant to be this way. Am I
> supposed to store my pSiS at a global location...? Especially great for
> dual head...

The server is single threaded; you can save pSiS in a global variable
quite safely between Prepare and the operation.

Re-entrancy isn't an issue here, only what state needs to be mutable
between calls to the operation function.

-keith

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