Race Conditions in File and State Transitions: Why a Lock on One Step Is Not a Control
Race Conditions in File and State Transitions: Why a Lock on One Step Is Not a Control Concurrency bugs live in the gap between deciding and doing.…
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Swift search: cancellation needs an ownership check
Robin Winters · October 2, 2026 · Educational example prepared with coding-assistant support Search often looks simple until two requests finish in…
Store Load Reordering: x86 vs ARM64, and the Bug Intel Was Hiding
Here is a bug report that keeps recurring, in different words, every time a team moves to ARM: "the same code works on our Intel CI and on the devel…
Function coloring is real and pretending context propagation isn't infection
Someone recently attempted to make the bold claim that function color isn't a real phenomenon. Unsurprisingly, the internet had a field day with tha…
Completion Is an Ownership Boundary
An async method can finish its useful work and still be holding lifecycle state that tells the rest of the system it is active. That sounds like a t…
How Java's Concurrency APIs Fit Together
A concurrency problem can begin with an ordinary requirement: let two independent operations make progress without forcing one to wait for the other…
The context you passed is not the context that cancels
Two failure modes, opposite in effect, same root cause. Both compile, and both are quiet in development. Failure one: the work dies with the request…
Concurrent Resource Scheduler v1.2.3: Sharded Priority Heaps Under Concurrent Load
GitHub: https://github.com/phero20/concurrent-resource-scheduler Go documentation: https://pkg.go.dev/github.com/phero20/concurrent-resource-schedul…
I Built a Concurrent Resource Scheduler in Go Using Sharded Priority Heaps
Support on GitHub: github.com/phero20/concurrent-resource-scheduler (Give it a star if you find it useful!) View Docs: pkg.go.dev/github.com/phero20…
Stop Making Your Agent Wait: Branch Prediction for Tool Calls
Speculative tool execution guesses the next tool while the model is still reasoning, runs it in parallel, and hides the latency — discarding the gue…
Go 1.25 testing/synctest: No More Flaky Concurrent Tests
Three green tests locally, two red on CI. The outcome depends on how busy the build server is that day. This isn't a logic bug — it's a time.Sleep t…
Catching Goroutine Leaks in Go Tests With goleak
Book: The Complete Guide to Go Programming Also by me: Hexagonal Architecture in Go — the companion book in the Thinking in Go series My project: He…
Stop Guessing Your Cache Locality: Verify JEP 401 Value Class Flattening with JFR
Stop Guessing Your Cache Locality: Verify JEP 401 Value Class Flattening with JFR JEP 401 value classes are a massive win for memory density, but to…
Resources for Learning to Build Technologies from Scratch with Go: Books and Free Online Courses
Introduction to Building Technologies from Scratch with Go Building technologies from scratch using Go is more than a learning exercise—it’s a gatew…
The Document Number Is Reserved Before the PDF Exists
The hard part of document numbering is not incrementing an integer. It is deciding what happens when the integer is reserved, rendering starts, and…
Code Review Horror Stories. Часть 2: API, ошибки и graceful shutdown
Продолжение разбора реального кода с собеседования. В первой части разобрали 8 проблем concurrency и memory: race conditions, утечки горутин, проигн…
Owned Async Work In TypeScript. Promise.race Does Not Cancel Your Work
Why Promise.race, Promise.all, and async helpers need an ownership model for cancellation, cleanup, and production agent work. Three providers. One…