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Title: [subinterpreters] Deny os.fork() in subinterpreters?
Type: Stage:
Components: Subinterpreters Versions: Python 3.10
Status: open Resolution:
Dependencies: Superseder:
Assigned To: Nosy List: vstinner
Priority: normal Keywords:

Created on 2020-11-13 14:23 by vstinner, last changed 2022-04-11 14:59 by admin.

Messages (1)
msg380891 - (view) Author: STINNER Victor (vstinner) * (Python committer) Date: 2020-11-13 14:23
_PyInterpreterState_DeleteExceptMain() contains the following check:

    PyThreadState *tstate = _PyThreadState_Swap(gilstate, NULL);
    if (tstate != NULL && tstate->interp != runtime->interpreters->main) {
        return _PyStatus_ERR("not main interpreter");

os.fork() is allow in subinterpreters and PyOS_AfterFork_Child() doesn't seem to update runtime->interpreters->main.

Either we should update runtime->interpreters->main after fork in the child process, or os.fork() should be denied in subinterpreters.

In bpo-37266, I denied the creation of daemon threads in subinterpreters. But I had to revert this change: see bpo-40234.
Date User Action Args
2022-04-11 14:59:38adminsetgithub: 86512
2020-11-13 14:23:09vstinnercreate