A Spinlock Implementation
summary
Microbenchmarks show an atomic increment hits ~200M ops/sec on one thread and falls to ~80M at 16 threads, while the custom spinlock sustains about ~167M across threads. Implementation uses an atomic exchange guarded by read-only probing to avoid costly exclusive cache line grabs, and a backoff that prefers nanosleep over sched_yield to let the unlocker run. Empirical tuning uses 8–12 spin iterations before yielding and a gradually increasing sleep time; the spinlock significantly improves throughput on tested hardware.
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