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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Expose _Py_NewInterpreter() as Py_NewInterpreterFromConfig()","articleBody":"A while back I added `_Py_NewInterpreter()` (a \"private\" API) to support configuring the new interpreter.  Ultimately, I'd like to adjust \r\nthe signature a little and then make the function part of the public API (as `Py_NewInterpreterFromConfig()`).\r\n\r\nMy plan:\r\n\r\n1. change the argument to a new `_PyInterpreterConfig` struct\r\n2. rename the function to `Py_NewInterpreterFromConfig()`, inspired by `Py_InitializeFromConfig()` (takes a `PyInterpreterConfig`  instead of `isolated_subinterpreter`)\r\n3. split up the boolean `isolated_subinterpreter` into the corresponding multiple granular settings\r\n   * allow_fork\r\n   * allow_subprocess\r\n   * allow_threads\r\n4. drop `PyConfig._isolated_interpreter`\r\n\r\nNote that the current default (`Py_NewInterpeter()` and `Py_Initialize*()`) allows fork, subprocess, and threads, and the optional \"isolated\" interpreter disables all three.  I'm not planning on changing any of that here.\r\n\r\nMy main objective here is to expose the existing API in a way that we can do the following afterward:\r\n\r\n* stop giving the option to disallow subprocess (i.e. drop `PyInterpreterConfig.allow_subprocess`)\r\n* add an option to disallow just \"exec\" instead\r\n* stop disallowing threads as a default behavior for an \"isolated\" interpreter (we'd still keep the option though)\r\n* add the option to disallow daemon threads\r\n* add an option to check if each extension supports running in multiple interpreters\r\n* add other options for PEP 684 (per-interpreter GIL)\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-102657\n* gh-102658\n* gh-102882\n* gh-102883\n* gh-107191\n* gh-107198\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/ericsnowcurrently","@type":"Person","name":"ericsnowcurrently"},"datePublished":"2022-10-24T17:16:03.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/98608/cpython/issues/98608"}