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Brief Concepts

1. Communicating Sequential Processes (CSPs)
2. Channels
3. Routines

Communicating Sequential Processes (CSPs)

Communicating sequential processes are a set of concurrent processes or threads that are allowed to synchronize with each other by synchronizing their I/O. CSP’s form the basis of Golang’s go-routines and channels. You can read more about CSPs in Wikipedia.

A fundamental tenet of CSP’s which is often repeated is:

Do not communicate by sharing memory; instead, share memory by communicating.

This has interesting impact on the design of JaCh, as we’ll see in later phases.

Channels

Channels are a communication structure which can be written to or read from. A channel behaves like a conduit in which messages can flow from one end to another. A channel can be

• Buffered, which can hold a fixed number of messages before further writes are blocked until something is read in.
• Unbuffered, in which only each message needs to be read in before any further write can happen.

Rountines

Routines are the concurrent processes that synchronize with each other using channels as a communication mechanism.

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