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Fixes dotnet#17714 (final PR) 1. Create `async-coordination-primitives.md` — from "Building Async Coordination Primitives" parts 1-4 (AsyncManualResetEvent, AsyncAutoResetEvent, AsyncCountdownEvent, AsyncBarrier). 1. Create `async-coordination-primitives-advanced.md` — from parts 5-7 (AsyncSemaphore, AsyncLock, AsyncReaderWriterLock). **Note BCL equivalents** (`SemaphoreSlim.WaitAsync`, `System.Threading.Channels`). 1. **Heavy modernization needed:** update all code for current .NET idioms, call out which primitives now have framework equivalents. 1. Add both to TOC under a "Coordination primitives" sub-section.
gfoidl
reviewed
Apr 17, 2026
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Fixes #17714 (final PR)
async-coordination-primitives.md— from "Building Async Coordination Primitives" parts 1-4 (AsyncManualResetEvent, AsyncAutoResetEvent, AsyncCountdownEvent, AsyncBarrier).async-coordination-primitives-advanced.md— from parts 5-7 (AsyncSemaphore, AsyncLock, AsyncReaderWriterLock). Note BCL equivalents (SemaphoreSlim.WaitAsync,System.Threading.Channels).Internal previews