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| # | Segment (≈minute mark) | Core Concept | Example Code Snippet | |---|-----------------------|--------------|----------------------| | 1️⃣ | 00:30 – 02:00 | – pthread_create , passing arguments safely. | c\npthread_t th;\nint rc = pthread_create(&th, NULL, worker, (void *)my_data);\n | | 2️⃣ | 02:00 – 03:30 | Joining vs. detaching – pthread_join vs. pthread_detach . | c\npthread_detach(th); // fire‑and‑forget\n | | 3️⃣ | 03:30 – 05:00 | Mutexes & condition variables – protecting shared data and waiting for events. | c\npthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;\npthread_cond_t cond = PTHREAD_COND_INITIALIZER;\n | | 4️⃣ | 05:00 – 06:30 | Thread‑local storage (TLS) – __thread keyword or pthread_key_create . | c\nstatic __thread int thread_id;\n | | 5️⃣ | 06:30 – 08:00 | Common pitfalls – deadlocks, priority inversion, and race conditions. | Diagram of lock ordering | | 6️⃣ | 08:00 – 09:30 | Performance tip – using pthread_barrier for phased computation, and avoiding false sharing. | c\npthread_barrier_t bar;\n | | 7️⃣ | 09:30 – 10:45 | Portable fallback – #ifdef _WIN32 → CreateThread vs. POSIX. | c\n#ifdef _WIN32\n HANDLE h = CreateThread(...);\n#else\n pthread_create(...);\n#endif\n | | 8️⃣ | 10:45 – End | Wrap‑up & cheat‑sheet – quick reference table shown on‑screen (reproduced below). | — | : Short for Telegram , signifying the platform

| Part | Title (expected) | What you’ll learn | |------|------------------|-------------------| | | Atomic Operations & Lock‑Free Programming | stdatomic.h , memory orderings, lock‑free queues. | | 63 | Thread Pools & Work Queues | Building a reusable pool, work‑stealing. | | 64 | Real‑Time Scheduling (SCHED_FIFO, SCHED_RR) | Priorities, deadline‑based threads. | | 65 | Debugging Multithreaded Apps | gdb , valgrind --tool=helgrind , ThreadSanitizer. | | 66 | Cross‑Platform Concurrency (C++11 <thread> vs. C) | When to switch to C++ for ergonomics. | detaching – pthread_join vs

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| ✅ Take‑away | Why it matters | |-------------|----------------| | | Prevents race conditions that produce nondeterministic bugs. | | Never lock two mutexes in opposite order | Avoids deadlocks; establish a global lock hierarchy. | | Use condition variables for “wait‑for‑event” patterns | Busy‑waiting wastes CPU cycles. | | Thread‑local storage is cheaper than a global + lock | Great for per‑thread counters, buffers, or error codes. | | Detach only when you don’t need a result | Detached threads can’t be joined; memory is reclaimed automatically when they exit. | | Barriers are perfect for phased algorithms (e.g., parallel matrix multiplication). | Guarantees all threads finish phase 1 before phase 2 starts. | | Portability: wrap POSIX calls in #ifdef s for Windows. | Makes your library usable on both Linux/macOS and Windows. | | Performance tip: align structures to cache‑line boundaries (avoid false sharing). | A small change that can double throughput on multi‑core CPUs. |

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