Conflict Exceptions: Simplifying Concurrent Language Semantics with Precise Hardware Exceptions for Data-Races

Provided by: Association for Computing Machinery
Topic: Storage
Format: PDF
The authors argue in this paper that concurrency errors should be treated as exceptions, i.e., have fail-stop behavior and precise semantics. They propose an exception model based on conflict of synchronization free regions, which precisely detects a broad class of data-races. They show that their exceptions provide enough guarantees to simplify high-level programming language semantics and debugging, but are significantly cheaper to enforce than traditional data-race detection. To make the performance cost of enforcement negligible, they propose architecture support for accurately detecting and precisely delivering these exceptions.

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