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gh-116738: Make _codecs module thread-safe (#117530)

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The module itself is a thin wrapper around calls to functions in
`Python/codecs.c`, so that's where the meaningful changes happened:

- Move codecs-related state that lives on `PyInterpreterState` to a
  struct declared in `pycore_codecs.h`.

- In free-threaded builds, add a mutex to `codecs_state` to synchronize
  operations on `search_path`. Because `search_path_mutex` is used as a
  normal mutex and not a critical section, we must be extremely careful
  with operations called while holding it.

- The codec registry is explicitly initialized as part of
  `_PyUnicode_InitEncodings` to simplify thread-safety.
This commit is contained in:
Brett Simmers 2024-05-02 15:25:36 -07:00 • committed by GitHub
parent 4e2caf2aa0
commit f8290df63f
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6 changed files with 120 additions and 79 deletions
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Tools/c-analyzer/cpython/ignored.tsv
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@ -344,7 +344,7 @@ Python/ceval.c - _PyEval_BinaryOps -
Python/ceval.c - _Py_INTERPRETER_TRAMPOLINE_INSTRUCTIONS -
Python/codecs.c - Py_hexdigits -
Python/codecs.c - ucnhash_capi -
Python/codecs.c _PyCodecRegistry_Init methods -
Python/codecs.c _PyCodec_InitRegistry methods -
Python/compile.c - NO_LABEL -
Python/compile.c - NO_LOCATION -
Python/dynload_shlib.c - _PyImport_DynLoadFiletab -

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