ln-628-concurrency-auditor

• Worker in ln-620 coordinator pipeline
• Audit concurrency (Category 11: High Priority)
• Check race conditions, async/await, thread safety
• Calculate compliance score (X/10)

Receives contextStore with tech stack, language, codebase root.

1) Parse context

2) Check concurrency patterns

3) Collect findings

4) Calculate score

5) Return JSON

1. Race Conditions

Detection:

• Shared state modified without synchronization
• Global variables accessed by multiple async functions
• Check for locks/mutexes usage

Severity:

• CRITICAL: Race condition in payment/auth
• HIGH: Race in user-facing feature
• MEDIUM: Race in background job

Recommendation: Use locks, atomic operations, message queues

Effort: M-L (redesign with synchronization)

2. Missing Async/Await

Detection:

• Callback hell: nested callbacks >3 levels
• Grep for .then().then().then()
• Find promises without await

Severity:

• MEDIUM: Callback hell (hard to maintain)
• LOW: Mixed Promise styles (then + await)

Recommendation: Convert to async/await

Effort: M (refactor control flow)

3. Resource Contention

Detection:

• Multiple file handles to same file
• Database connection pool exhausted
• Concurrent writes without locking

Severity:

• HIGH: File corruption risk
• MEDIUM: Performance degradation

Recommendation: Use connection pooling, file locking

Effort: M (add resource management)

4. Thread Safety Violations

Detection (Go, Rust, Java):

• Shared mutable state
• Missing sync.Mutex (Go)
• Missing Arc> (Rust)
• Missing synchronized (Java)

Severity:

• HIGH: Data corruption possible

Recommendation: Use thread-safe primitives

Effort: M (add synchronization)

5. Deadlock Potential

Detection:

• Multiple locks acquired in different order
• Lock held while calling external API

Severity:

• HIGH: Deadlock freezes application

Recommendation: Consistent lock ordering, timeout locks

Effort: L (redesign locking strategy)

```

penalty = (critical 2.0) + (high 1.0) + (medium 0.5) + (low 0.2)

score = max(0, 10 - penalty)

```

```json

{

"category": "Concurrency",

"score": 7,

"total_issues": 4,

"critical": 0,

"high": 2,

"medium": 2,

"low": 0,

"findings": [

{

"severity": "HIGH",

"location": "src/services/payment.ts:45",

"issue": "Shared state 'balanceCache' modified without synchronization",

"principle": "Thread Safety / Concurrency Control",

"recommendation": "Use mutex or atomic operations for balanceCache updates",

"effort": "M"

}

]

}

```

---

Version: 3.0.0

Last Updated: 2025-12-23