notes

scratchpad · phemantics.xyz

Python concurrency · the series

• 01  The GIL is Not Your Enemy Refcounting, the 5ms handoff, and what the lock actually protects.
• 02  The Loop is the Trick epoll, coroutines, _run_once, and the Task spine that drives them.
• 03  Asyncio Sidequests The self-pipe, signals, debug mode, asyncio.run, contextvars, uvloop.
• 04  Two Ways to Cancel anyio, checkpoints, and the protocols await is made of.
• 05  Servers, in Earnest Putting the loop to work behind a real request-serving stack.

Python concurrency · standalones

• Measure the Loop, Not the Request Instrumenting asyncio: stall canary, task census, py-spy, the five metrics.
• Middleware is an Onion Starlette's request stack, layer by layer, and where it leaks.
• The Peek That Always Returns False Chasing SSE disconnect detection through five middleware layers.

DSA · stock span

• Stock Span — Level 1
• Reign — Level 2
• Operations — Round 1