Published and maintained writing, ordered by the most recent update.https://thinkerqaq.com/enhttps://thinkerqaq.com/en/articles/concurrency-series-01-5-thread-scheduling/https://thinkerqaq.com/en/articles/concurrency-series-01-5-thread-scheduling/Following Java platform and virtual threads, Go G-M-P, and CPython threads from their runtime representations to OS threads and ultimately CPU execution.Sun, 04 Oct 2026 07:08:00 GMTConcurrencyOperating SystemThreadSchedulerJVMGo RuntimeCPythonhttps://thinkerqaq.com/en/articles/concurrency-series-01-hardware/https://thinkerqaq.com/en/articles/concurrency-series-01-hardware/Starting from the von Neumann architecture and instruction execution, this article follows count++ down to the hardware-level problems of atomicity, visibility, and ordering.Mon, 07 Sep 2026 03:08:48 GMTConcurrencyCPUMemory ModelJavaGoPythonhttps://thinkerqaq.com/en/articles/concurrency-series-02-language-memory-model/https://thinkerqaq.com/en/articles/concurrency-series-02-language-memory-model/Moves from hardware memory models back to the language layer: why languages need their own concurrency semantics, and what Java, Go, and CPython guarantee to concurrent programs.Mon, 07 Sep 2026 07:13:00 GMTConcurrencyMemory ModelJavaGoPythonhttps://thinkerqaq.com/en/articles/concurrency-series-00/https://thinkerqaq.com/en/articles/concurrency-series-00/Defines the scope as concurrency within a single process on a single machine, then connects shared variables, shared memory, message passing, language concurrency semantics, and hardware implementation.Sun, 06 Sep 2026 09:58:00 GMTConcurrencyJavaGoPythonhttps://thinkerqaq.com/en/articles/concurrency-series-04-mutex-implementation/https://thinkerqaq.com/en/articles/concurrency-series-04-mutex-implementation/Traces the actual implementation paths of Java synchronized, Go sync.Mutex, and CPython threading.Lock to show how mutexes rely on atomic operations, memory ordering, and waiting and wake-up mechanisms.Tue, 08 Sep 2026 15:11:56 GMTConcurrencyMutexJVMGo RuntimeCPythonhttps://thinkerqaq.com/en/articles/concurrency-series-08-read-write-lock/https://thinkerqaq.com/en/articles/concurrency-series-08-read-write-lock/Uses the same counter and counter + ready examples to trace read-write locks from Java language-level rules through the JDK, HotSpot, and x86-64, explaining Atomicity, Visibility, Ordering, and the boundary with Mutex.Fri, 11 Sep 2026 07:30:00 GMTConcurrencyRead-Write LockRWMutexJavaGoPythonhttps://thinkerqaq.com/en/articles/concurrency-series-07-volatile/https://thinkerqaq.com/en/articles/concurrency-series-07-volatile/Uses the counter + ready example to trace Java volatile from the Java Memory Model through HotSpot to x86-64, showing how visibility and ordering are defined and implemented, and how volatile differs from atomics and mutexes.Tue, 08 Sep 2026 15:41:00 GMTConcurrencyvolatileJavaGoPythonMemory Modelhttps://thinkerqaq.com/en/articles/concurrency-series-05-atomic-cas/https://thinkerqaq.com/en/articles/concurrency-series-05-atomic-cas/Continues with counter and ready to explain the language-level rules behind Java AtomicInteger, Go sync/atomic, and CPython's application-level Atomic boundary.Tue, 08 Sep 2026 15:30:00 GMTConcurrencyAtomicCASJavaGoPythonhttps://thinkerqaq.com/en/articles/concurrency-series-03-mutex/https://thinkerqaq.com/en/articles/concurrency-series-03-mutex/Continues with counter++ to explain how mutexes provide atomicity, visibility, and ordering, then compares Java synchronized, Go sync.Mutex, and CPython threading.Lock.Tue, 08 Sep 2026 10:32:54 GMTConcurrencyMutexJavaGoPythonhttps://thinkerqaq.com/en/articles/personal-blog-series-00-why-blog/https://thinkerqaq.com/en/articles/personal-blog-series-00-why-blog/In an age of mature content platforms and video media, I revisit why I still write a blog: to move from notes to articles, think more deeply through writing, and preserve how my understanding changes over time.Thu, 17 Sep 2026 01:00:00 GMTBloggingWritingPersonal Bloghttps://thinkerqaq.com/en/articles/concurrency-series-06-atomic-implementation/https://thinkerqaq.com/en/articles/concurrency-series-06-atomic-implementation/Traces the implementation paths of Java AtomicInteger, Go sync/atomic, and CPython's internal atomic operations to show how atomic RMW, CAS, and memory ordering reach the CPU.Tue, 08 Sep 2026 15:36:00 GMTConcurrencyAtomicCASJavaGoCPythonhttps://thinkerqaq.com/en/articles/software-system-technical-planning-methodology/https://thinkerqaq.com/en/articles/software-system-technical-planning-methodology/Starting from the scope and value of technical planning, this article outlines a practical method for analyzing the current state, defining a target state, identifying problems, selecting solutions, and driving execution.Sun, 23 Jun 2024 14:22:29 GMTSystem DesignTechnical PlanningArchitecture Designhttps://thinkerqaq.com/en/articles/how-i-think-about-life-when-anxious/https://thinkerqaq.com/en/articles/how-i-think-about-life-when-anxious/Starting from anxiety and the idea of 'standing firm at thirty,' this article reflects on how to understand life, what shapes it, and how to spend limited time on what truly matters.Sat, 15 Jun 2024 08:50:52 GMTReflectionLifeLife Planning