René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Add a Per-Interpreter \"HEAD\" Lock","articleBody":"# Feature or enhancement\n\nWe have a lock that we use for thread-safety when working with the set of interpreters: `_PyRuntimeState.interpreters.mutex`.  We use two macros in several core files to manage that lock: `HEAD_LOCK()` and `HEAD_UNLOCK()` (from pycore_pystate.h).\n\nRecently we've begun using that runtime-global lock for thread-safety when working with a single interpreter's set of thread states (`PyInterpreterState.threads`).  The problem is that this means we are potentially blocking interpreters unnecessarily.\n\nThus it makes sense to introduce an interpreter-specific \"head\" lock: `PyInterpreterState.threads.mutex` (plus corresponding macros).\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-125561\n* gh-127037\n* gh-127077\n* gh-127115\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/ericsnowcurrently","@type":"Person","name":"ericsnowcurrently"},"datePublished":"2024-02-02T22:42:45.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/114940/cpython/issues/114940"}