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check-distributed-locks

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Analyzes PHP code for distributed lock issues. Detects missing TTL on locks, lock without try/finally, unsafe Redis SETNX patterns, missing lock release, and deadlock risks.

skills/check-distributed-locks/SKILL.md

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Aug 16, 2026
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MIT

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# Distributed Lock Check

Analyze PHP code for distributed locking anti-patterns that cause deadlocks, race conditions, and resource starvation in multi-instance deployments.

## Detection Patterns

### 1. Missing TTL on Locks

```php
<?php

declare(strict_types=1);

// BAD: Lock without expiration -- if process dies, lock is held forever
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