Inter-Object and Intra-Object Concurrency in Creol

In traditional object-oriented languages, method calls are synchronous: The thread of control is passed from the caller to the callee, blocking the caller until the call is finished. This suits tightly coupled systems but leads to unnecessary delays in distributed environments, where objects are dispersed geographically. Another problem shared by thread-based object-oriented languages is that control threads may interfere with each other when operating on the same object. Creol is a language for concurrent objects that addresses these issues through two novel language constructs: asynchronous method calls and explicit processor release points.