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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Move the `eval_breaker` to `PyThreadState`","articleBody":"# Feature or enhancement\n\nThe `eval_breaker` is a variable that keeps track of requests to break out of the eval loop to handle things like signals, run a garbage collection, or handle asynchronous exceptions. It is currently in the interpreter state (in `interp-\u003eceval.eval_breaker`). However, some of the events are specific to a given thread. For example, signals and some pending calls can only be executed on the \"main\" thread of an interpreter. \n\nWe should move the `eval_breaker` to `PyThreadState` to better handle these thread-specific events. This is more important for the `--disable-gil` builds where multiple threads within the same interpreter may be running at the same time.\n\n@markshannon suggested a combination of per-interpreter and per-thread state, where the thread copies the per-interpreter eval_breaker state to the per-thread state when it acquires the GIL.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-115194\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/colesbury","@type":"Person","name":"colesbury"},"datePublished":"2023-11-16T18:16:53.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/112175/cpython/issues/112175"}