Unprotected shared state, missing locks, and async/await pitfalls are ticking time bombs. ConcurrencyGuard scans your codebase and defuses every single one — across 6 languages, 90+ patterns, 100% locally.
Every unprotected shared variable is a Heisenbug waiting to happen. Every missing lock is a data corruption you won't see until 3 AM in production. ConcurrencyGuard scans your codebase statically and gives you a clear fix for every hazard it finds.
Detects unprotected mutable shared variables, global state mutations across threads, and concurrent collection access without synchronization. The #1 source of race conditions.
Finds goroutine map access without sync.RWMutex, Java fields missing synchronized, Python threading without Lock, and C# shared access without lock blocks.
Catches time-of-check to time-of-use races: file existence checks before writes, permission checks before access, and database read-then-update without transactions.
Identifies shared state mutations inside async functions, missing await on concurrent operations, Promise.all with shared mutable refs, and unguarded event-loop re-entry.
Flags lazy singletons without double-checked locking, non-volatile instance fields in Java, Python module-level mutable state used across threads, and unsafe static initializers.
Detects database read-modify-write without proper isolation levels, missing SELECT FOR UPDATE, concurrent counter increments without atomics, and optimistic locking gaps.
| Scenario | Without | With ConcurrencyGuard |
|---|---|---|
| Shared map accessed by goroutines | ✗ Panic at random in production | ✓ Flagged at commit time with fix |
| Async function mutating outer variable | ✗ Silent data corruption | ✓ AW-003 with mutex suggestion |
| File check-then-write race | ✗ Security vulnerability shipped | ✓ TC-001 with atomic alternative |
| Lazy singleton without DCL | ✗ Double initialization under load | ✓ TS-002 with safe pattern |
| Counter increment without transaction | ✗ Lost updates, wrong totals | ✓ DL-004 with isolation fix |
| Java field missing synchronized | ✗ Intermittent test failures | ✓ LK-001 caught in pre-commit |
| Promise.all with shared mutable ref | ✗ Nondeterministic results | ✓ AW-007 with immutable approach |
| Python global dict in threaded server | ✗ Request data leaked between users | ✓ SS-009 with threading.Lock fix |
| Rust Arc without Mutex inner | ✗ Won't compile (Rust catches it!) | ✓ Still flagged for clarity |
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Install ConcurrencyGuard in 30 seconds. Find every unprotected shared state, missing lock, and async hazard in your codebase.