[pull] main from python:main#1256
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* Check for signals more often. Previously, a pending exception could be removed by PyErr_Clear(). * Only call _PyInterpreterState_SetNotRunningMain() if _PyInterpreterState_SetRunningMain() has been called. * Add pymain_error() and pyrun_error(): write the error message to sys.stderr instead of the C stream stderr. * Convert _PyPathConfig_UpdateGlobal() PyStatus error to an exception. * Simplify pymain_run_startup(): avoid strerror() which is decoded from the wrong encoding. Instead display the exception, Py_fopen() raises an OSError with the path object (and can raise other exceptions). * Add pymain_set_path0() function. * Add _PySys_FormatV() function.
PyRun functions now raises ValueError if the start argument is invalid. * Add Modules/_testlimitedcapi/run.c. * Rename _Py_CompileStringObjectWithModule() to _Py_CompileStringObject().
…uild (gh-153063) itertools.tee branches share a linked list of teedataobject cells. On the free-threaded build, iterating one branch from multiple threads, or iterating sibling branches concurrently, raced on the shared cells and each branch's position, corrupting refcounts and crashing. Lock each teedataobject while reading, extending, or clearing it, and snapshot each branch's position under the tee object's own lock, revalidating before advancing, so the two locks are never nested. Concurrent iteration of one tee is undefined and may raise RuntimeError as documented, but no longer crashes. The free-threading snapshot and revalidation add per-element overhead on the default build, where the GIL already serializes access. Guard that path under Py_GIL_DISABLED so the default build keeps the original iteration and the free-threaded path is unchanged. Co-authored-by: Neil Schemenauer <nas-github@arctrix.com>
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