A chord is a concurrency construct available in Polyphonic C♯ and Cω inspired by the join pattern of the

join-calculus The join-calculus is a process calculus developed at INRIA. The join-calculus was developed to provide a formal basis for the design of distributed programming languages, and therefore intentionally avoids communications constructs found in othe ...

. A chord is a function body that is associated with multiple function headers and cannot execute until all function headers are called.

Synchronicity

Cω defines two types of functions synchronous and asynchronous. A synchronous function acts like a standard function in most Object-Oriented Language, upon invocation the function body is executed and a return value may or may not be returned to the caller. An asynchronous function acts similar to a function that returns void except that it is guaranteed to return immediately with the execution being done in a separate thread.

References

{{reflist, 1 Concurrency (computer science)