POSIX Threads API

As explained in Refactoring to Rust

POSIX threads are a standardized operating-system threading interface for creating and managing native threads.

POSIX threads, or pthreads, provide operating-system-managed threads for concurrent work. Unlike green threads maintained by a language or runtime, these threads are scheduled by the operating system and can provide parallelism when multiple processing units are available. section 8.4

Threaded computation

A Python program can submit separate Mandelbrot calculations to a four-worker ThreadPoolExecutor and await them alongside asyncio tasks. This tests whether CPU-bound or externally blocked work benefits from operating-system threads; asynchronous execution alone may show little improvement. section 8.4

Figure 8.5 Within our box, we do not know how many crushers we have, and we have no guarantee of the order. Adding more crushers adds more throughput.

The crusher analogy visualizes how additional operating-system workers can increase throughput while completion order remains unpredictable. section 8.4

How Refactoring to Rust covers it

How deep it goes

Defines operating-system and green threads, then demonstrates Python thread submission without detailing the pthreads API.

Examples

Uses a can-crusher throughput analogy and a Python Mandelbrot ThreadPoolExecutor example.

What it assumes

Assumes basic familiarity with Python asynchronous execution while distinguishing concurrency from parallelism.

What you can do after

Evaluate threaded computation with Python’s ThreadPoolExecutor and compare its measured improvement against asynchronous execution.

How it connects

Connects POSIX threads with concurrency, parallelism, green threads, asyncio, and operating-system scheduling.

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Also explained in

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  Learn Concurrent Programming with GoPOSIX Threads is a standardized API and specification for creating, managing, and synchronizing threads.

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Related concepts

• apikind of · An application programming interface (API) is a defined set of operations and conventions through which software components access functionality or exchange data.
• threadimplements · A thread is an independently schedulable sequence or context of execution within a program or process.
• concurrencyimplements · Concurrency is the structuring or execution of multiple computational activities so their progress overlaps in time, whether or not they run simultaneously.

This explainer was generated by Manning's knowledge graph from the text of Refactoring to Rust. The section links point to the parts of the book it draws on.