Uno/Spec/Threading-Model

version: 8180
state: draft
type: specification

UNO Threading Model

Feature

The UNO Runtime provides support for implementing

• Thread Safe, or
• Thread Unsafe, or
• Thread Affine

Code.

The threading type of any code can be specified appropriately. The Thread Unsafe type is the default type for any implementation.

Rationale

API

The different threading models are accessible as Purpose Environments.

The predefined purposes for objects are defined according to their threading type,

• ":unsafe" - for Thread Unsafe code,
• ":affine" - for Thread Affine code, and
• "" - for Thread Safe code, to ensure compatibility with previous UNO versions.

Stacked Environments: The current (purpose) environment does not only vary with the implementation language (e.g. Java or C++), but also with the executed codes declared threading type. Therefor an API for accessing the current environment is provided.

Purpose environments may be passed to the Runtime for accessing cascaded mappings ("gcc3" => "java:mutex:debug").

Implementation Environments: Client code as well as service code may be declared once, to either be thread safe, thread affine or thread unsafe.

Dependencies

Uno/Spec/Thread Affine Environment

Uno/Spec/Thread Unsafe Environment

Uno/Spec/Purpose Environment

Compatibility Issues

None.