Building a lock‑free integer counter with C11 _Atomic
Learn how to declare, initialize, and use a C11 _Atomic integer as a lock‑free counter, with compile commands, verification steps, and fallback options.
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Learn how to declare, initialize, and use a C11 _Atomic integer as a lock‑free counter, with compile commands, verification steps, and fallback options.
Shared multi-byte counter shows torn reads An Arduino Uno sketch uses a volatile uint32_t counter incremented inside a pin-change ISR and read periodically in loop() for telemetry. The ISR executes in a few microseconds and the main loop prints the value every 100 ms. Despite volatile preventing register caching, occasional printed values show impossible jum
Issue: atomic compare‑exchange never returns when a deadline is enforced In a Linux userspace program compiled for ARMv8‑A, a thread repeatedly executes a C++ std::atomic::compare_exchange_weak inside a loop that also checks a deadline and a cancellation flag. When the operation is contended on a big core, the loop appears to spin forever, even though the de