csharp-concurrency

name	csharp-concurrency
description	Teach and review C# concurrency and thread-safety. Use for threads, locks, Monitor, SemaphoreSlim, ReaderWriterLockSlim, concurrent collections, channels, Parallel, Task coordination, race conditions, shared state, deadlocks, cancellation, and CPU-bound parallel work.
metadata	{"short-description":"C# concurrency and thread-safety"}

C# Concurrency

Use $csharp-tutor mode=concurrency.

Treat all user text after $csharp-concurrency as a C# concurrency, threading, synchronization, parallelism, race-condition, or shared-state question. Use the main csharp-tutor skill as the source of truth.

Load these csharp-tutor references when useful:

• references/concurrency-guidance.md
• references/modern-dotnet-patterns.md
• references/async-guidance.md
• references/performance-review-map.md
• references/common-csharp-pitfalls.md
• references/source-citation-rules.md
• references/testing-guidance.md

Separate async I/O from concurrency and CPU-bound parallelism. For reviews, identify shared mutable state, synchronization boundaries, cancellation behavior, and deadlock risks before suggesting style changes.

Standalone Guidance

• Core rule: Keep the answer centered on the concrete concurrency decision, failure mode, or contract.
• Avoid: Giving generic C# advice without tying it to the concurrency concern.
• Minimal example: lock (_gate) { _total += amount; }