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Zig's Asynchronous I/O: Asynchrony ≠ Concurrency

2025-07-19

This article delves into the often-confused concepts of asynchrony, concurrency, and parallelism in concurrent programming. The author argues that many language ecosystems suffer from a lack of understanding of 'asynchrony,' leading to duplicated library efforts and a worse user experience. Zig differentiates asynchrony from concurrency, enabling asynchronous I/O without mandatory concurrency. This prevents the 'viral' spread of asynchronous code, allowing synchronous and asynchronous code to coexist peacefully, improving code efficiency and maintainability.

Zig's Asynchronous I/O Revolution: Decoupling Concurrency from Execution Models

2025-07-13

Zig is revolutionizing its asynchronous I/O model, aiming to decouple async/await from the execution model for improved code reusability and performance. A new `Io` interface allows users to customize I/O implementations and supports concurrent operations. `io.async` and `Future.await` simplify expressing concurrency without worrying about the underlying execution model. Zig will offer various `Io` implementations, including thread pool, green threads, and stackless coroutines, for different needs and platform compatibility. This enhances Zig's flexibility and efficiency in handling asynchronous I/O while avoiding the common "function color" problem in traditional async programming.

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