1 files changed, 31 insertions, 0 deletions
diff --git a/Include/internal/pycore_codecs.h b/Include/internal/pycore_codecs.h
index a2a7151..5e2d5c5 100644
--- a/Include/internal/pycore_codecs.h
+++ b/Include/internal/pycore_codecs.h
@@ -8,6 +8,17 @@ extern "C" {
 #  error "this header requires Py_BUILD_CORE define"
 #endif
 
+#include "pycore_lock.h"          // PyMutex
+
+/* Initialize codecs-related state for the given interpreter, including
+   registering the first codec search function. Must be called before any other
+   PyCodec-related functions, and while only one thread is active. */
+extern PyStatus _PyCodec_InitRegistry(PyInterpreterState *interp);
+
+/* Finalize codecs-related state for the given interpreter. No PyCodec-related
+   functions other than PyCodec_Unregister() may be called after this. */
+extern void _PyCodec_Fini(PyInterpreterState *interp);
+
 extern PyObject* _PyCodec_Lookup(const char *encoding);
 
 /* Text codec specific encoding and decoding API.
@@ -48,6 +59,26 @@ extern PyObject* _PyCodecInfo_GetIncrementalEncoder(
    PyObject *codec_info,
    const char *errors);
 
+// Per-interpreter state used by codecs.c.
+struct codecs_state {
+    // A list of callable objects used to search for codecs.
+    PyObject *search_path;
+
+    // A dict mapping codec names to codecs returned from a callable in
+    // search_path.
+    PyObject *search_cache;
+
+    // A dict mapping error handling strategies to functions to implement them.
+    PyObject *error_registry;
+
+#ifdef Py_GIL_DISABLED
+    // Used to safely delete a specific item from search_path.
+    PyMutex search_path_mutex;
+#endif
+
+    // Whether or not the rest of the state is initialized.
+    int initialized;
+};
 
 #ifdef __cplusplus
 }