computer science

Rendezvous (Plan 9)

Rendezvous (Plan 9) is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Rendezvous (Plan 9) rather than just read about it. In short: Rendezvous is a data synchronization mechanism in Plan 9 from Bell Labs. It is a system call that allows two processes to exchange a single datum while synchronizing.

Key takeaways

Rendezvous (Plan 9) belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Rendezvous (Plan 9) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Rendezvous (Plan 9) from memory before moving on to harder problems.

Reference excerpt

Rendezvous is a data synchronization mechanism in Plan 9 from Bell Labs. It is a system call that allows two processes to exchange a single datum while synchronizing. The rendezvous call takes a tag and a value as its arguments. The tag is typically an address in memory shared by both processes. Calling rendezvous causes a process to sleep until a second rendezvous call with a matching tag occurs. Then, the values are exchanged and both processes are awakened. More complex synchronization mechanisms can be created from this primitive operation. See also mutual exclusion.

See also Synchronous rendezvous Communicating sequential processes

References

External links Process Sleep and Wakeup on a Shared-memory Multiprocessor by Rob Pike, Dave Presotto, Ken Thompson and Gerard Holzmann.

Worked examples

Example 1 — a first encounter with Rendezvous (Plan 9)

Start with the simplest possible case. Write down what Rendezvous (Plan 9) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Rendezvous (Plan 9) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Rendezvous (Plan 9) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Rendezvous (Plan 9)

In research: Rendezvous (Plan 9) appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Rendezvous (Plan 9) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Rendezvous (Plan 9) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Inter-process communication, Operating system stubs, Parallel computing, so understanding it makes those chapters shorter.
In everyday life: Look for Rendezvous (Plan 9) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Rendezvous (Plan 9) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Rendezvous (Plan 9) means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Rendezvous (Plan 9) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Rendezvous (Plan 9) in simple terms?

Rendezvous is a data synchronization mechanism in Plan 9 from Bell Labs. It is a system call that allows two processes to exchange a single datum while synchronizing.

Why does Rendezvous (Plan 9) matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Rendezvous (Plan 9)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Rendezvous (Plan 9).