Uno/Effort/Binary/Extend Threading-Model

From Apache OpenOffice Wiki
< Uno
Revision as of 09:37, 24 November 2006 by Kr (Talk | contribs)

Jump to: navigation, search

Type: effort Status: in progress(UTF2) Owner: Kay Ramme, [1]

The mission of this effort is, to extend the Uno threading-model, to provide a way to design an applications threading-architecture independent of the implementations. This can be described as transparent-concurrency wrt the implementations.

Problem

Not everything should be required to be implemented thread-safe. E.g. see comments from John Ousterhout regarding multi-threading. Encapsulation of thread-affinity should be easy.

Solution

The extended Uno threading-model is going to basically introduce the notion of an apartment into the Uno world. An apartment in Uno terms is a purpose environment. Such an environment can be seen as a dedicated part of a process, giving space for objects of the same Object Binary Interface (OBI) and the same purpose. An environment can only be entered and left via defined doors, being proxy objects representing objects outside respectively inside the environment.

UNO Envs.jpg

All calls from one Uno Environment to another are intercepted, references to local objects are replaced with proxies to these local objects, this operation is called "mapping" in Uno terms. Actually, an object gets "mapped" from one Uno Environment to another. Proxies already representing to be mapped objects of another Uno Environment become reused during the "mapping" operation, ensuring that an object can only be "mapped" once.

Purpose environments may be dedicated to MutExes or threads. In the sense, that a MutEx becomes acquired or a thread gets switched to before a call enters an environment.

Time Frame

Current understanding of the topic lets us think, that the first changes of OOo / Uno on behalf of the extend threading-model are going to be integrated into one of the next updates, probably late in 2006. The plan is, to implement the whole stack into the UTF2 CWS to ensure that everything works as expected, and to split the implementation into 'integration chunks', to be integrated with different CWS, to reduce the risk of breaking anything.

Tasks

Area Title State CWS
Binary Uno

Preparation

  • enable identity mapping: getting a Uno Mapping from and to the same environment - currently the runtime does return NULL, so every client has to check for it,
  • cleanup the dll component loader
    • to use the identity mapping, and
    • to get rid of very outdated deprecated stuff
100% bunoidmap
Binary Uno Implement Threading-Model 90% bunoexttm
Binary Uno Adapt Threading Architecture 90% utf2
Binary Uno Uno/Effort/Binary/Implement Environment Stack Support 50% utf2
Binary Uno Purpose Bridge Tester 80% utf2
C++ Uno Threading-Model 75% utf2
C++ Uno

Misc Improvements

  • uno::Environment Convenience Constructors
  • uno::Mapping Convenience Constructors
100% krmisc
C++ Uno Purpose Bridge Implementation Helper 100% utf2
Personal tools