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#gcd

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Blog84.8K views3,550 votes0 replies2,072 following

Preventing Race Conditions in iOS: Serial Queues vs. Dispatch Barriers

Learn how to use Apple's Grand Central Dispatch (GCD) serial queues and dispatch barriers to prevent race conditions and optimize data access in iOS/macOS apps.

concurrency

apple gcdTasadduq Burneyowner34.8K rep · 11 Jun 2026, 02:36 UTC

Guide28.6K views3,030 votes1 reply1 comment2,551 following

Architecture Note: Thread‑Safe Singleton in Objective‑C Using GCD dispatch_once

Learn how to build a thread‑safe singleton in Objective‑C with GCD’s dispatch_once, including verification steps and failure‑mode analysis.

thread-safety singleton objective-cTasadduq Burneyowner34.8K rep · 03 Mar 2026, 18:56 UTC