CPC: programming with a massive number of lightweight threads

Details CPC: programming with a massive number of lightweight threads CPC: programming with a massive number of lightweight threads

2011-02-04

arxiv.org/abs/1102.0951v1

Computer Science

Programming Languages

To appear in PLACES'11

Scientific paper

Threads are a convenient and modular abstraction for writing concurrent programs, but often fairly expensive. The standard alternative to threads, event-loop programming, allows much lighter units of concurrency, but leads to code that is difficult to write and even harder to understand. Continuation Passing C (CPC) is a translator that converts a program written in threaded style into a program written with events and native system threads, at the programmer's choice. Together with two undergraduate students, we taught ourselves how to program in CPC by writing Hekate, a massively concurrent network server designed to efficiently handle tens of thousands of simultaneously connected peers. In this paper, we describe a number of programming idioms that we learnt while writing Hekate; while some of these idioms are specific to CPC, many should be applicable to other programming systems with sufficiently cheap threads.

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