Andrew Healey • 12/21/2025

A Fair, Cancelable Semaphore in Go

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This technical article details the author's experience implementing a semaphore in Go from scratch, focusing on adding fairness (FIFO ordering) and context cancellation support. It explains the limitations of simple channel-based limiters, discusses concurrency bugs, and demonstrates a solution using a queue for ordered resource access and proper cancellation handling.

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#concurrency #go #channels
A Fair, Cancelable Semaphore in Go

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