1 files changed, 49 insertions, 1 deletions

diff --git a/Doc/c-api/init.rst b/Doc/c-api/init.rst
index 4dad2c814d..0587e15d9f 100644
--- a/Doc/c-api/init.rst
+++ b/Doc/c-api/init.rst
@@ -86,6 +86,36 @@ Process-wide parameters
 =======================
 
 
+.. c:function:: int Py_SetStandardStreamEncoding(char *encoding, char *errors)
+
+   .. index::
+      single: Py_Initialize()
+      single: main()
+      triple: stdin; stdout; sdterr
+
+   This function should be called before :c:func:`Py_Initialize`, if it is
+   called at all. It specifies which encoding and error handling to use
+   with standard IO, with the same meanings as in :func:`str.encode`.
+
+   It overrides :envvar:`PYTHONIOENCODING` values, and allows embedding code
+   to control IO encoding when the environment variable does not work.
+
+   ``encoding`` and/or ``errors`` may be NULL to use
+   :envvar:`PYTHONIOENCODING` and/or default values (depending on other
+   settings).
+
+   Note that :data:`sys.stderr` always uses the "backslashreplace" error
+   handler, regardless of this (or any other) setting.
+
+   If :c:func:`Py_Finalize` is called, this function will need to be called
+   again in order to affect subsequent calls to :c:func:`Py_Initialize`.
+
+   Returns 0 if successful, a nonzero value on error (e.g. calling after the
+   interpreter has already been initialized).
+
+   .. versionadded:: 3.4
+
+
 .. c:function:: void Py_SetProgramName(wchar_t *name)
 
    .. index::
@@ -329,7 +359,11 @@ Process-wide parameters
 
 .. c:function:: void PySys_SetArgv(int argc, wchar_t **argv)
 
-   This function works like :c:func:`PySys_SetArgvEx` with *updatepath* set to 1.
+   This function works like :c:func:`PySys_SetArgvEx` with *updatepath* set
+   to 1 unless the :program:`python` interpreter was started with the
+   :option:`-I`.
+
+   .. versionchanged:: 3.4 The *updatepath* value depends on :option:`-I`.
 
 
 .. c:function:: void Py_SetPythonHome(wchar_t *home)
@@ -658,6 +692,20 @@ with sub-interpreters:
    made on the main thread.  This is mainly a helper/diagnostic function.
 
 
+.. c:function:: int PyGILState_Check()
+
+   Return 1 if the current thread is holding the GIL and 0 otherwise.
+   This function can be called from any thread at any time.
+   Only if it has had its Python thread state initialized and currently is
+   holding the GIL will it return 1.
+   This is mainly a helper/diagnostic function.  It can be useful
+   for example in callback contexts or memory allocation functions when
+   knowing that the GIL is locked can allow the caller to perform sensitive
+   actions or otherwise behave differently.
+
+   .. versionadded:: 3.4
+
+
 The following macros are normally used without a trailing semicolon; look for
 example usage in the Python source distribution.