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A concurrency block with a group expression and cancel-in-progress stops superseded CI runs. Here is the queue rule, a worked YAML example, and the matrix and head_ref mistakes that break it.
When building concurrent Haskell programs, choosing between MVar and STM is critical. This guide weighs constraints, compares options, and shows a hands‑on counter benchmark to help you decide.
switchMap, concatMap, mergeMap and exhaustMap differ only in what happens when a new value arrives mid-flight. A typeahead example, the cancellation caveat, and three ways to verify the behavior in your installed RxJS version.
Learn how to implement high-concurrency I/O in Rust using Tokio, focusing on JoinSet for task tracking, watch channels for graceful shutdown, and avoiding runtime deadlocks.
An architecture note on using Haskell's STM and TVar for composable, lock-free concurrent state: requirements, minimal design, trust boundaries, operational checks, failure modes, and when to switch approaches.
Learn how to use Java semaphores to limit concurrent resource access. This guide covers creating a semaphore, acquiring/releasing permits, handling timeouts, and verifying correct behavior with a concrete example.
Learn how to enable Go's built‑in race detector, spot a data race in a simple counter example, and fix it with a mutex, while understanding the detector’s performance cost and blind spots.
Astro middleware runs on every SSR or hybrid request before page rendering and API routes. When deployed with an edge adapter such as Cloudflare Workers, Vercel Edge Functions or Netlify Edge Functions, the middleware executes inside the runtime's isolate model. The pipeline is serial by design, with each middleware awaiting next(). Under concurrent requests
Learn how to move heavy calculations to a worker thread so the Node.js event loop stays responsive for I/O, with a complete example and verification steps.
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