Threads & Mutex in C++

From the C++ cheat sheet · Concurrency · verified Jul 2026

Running work in parallel safely.

cpp

// Quick Reference
#include <thread>
#include <mutex>
std::thread t([]{ work(); });
t.join();
std::mutex m;
std::lock_guard<std::mutex> lock(m);

💡 Every std::thread must be joined or detached before it is destroyed, or the program aborts.

⚡ std::jthread (C++20) auto-joins on destruction - prefer it over raw std::thread.

📌 Guard shared data with std::lock_guard/scoped_lock - RAII unlocks even on exceptions.

🟢 Unsynchronized access to shared mutable data from multiple threads is a data race (UB).

threadsmutex

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