[WIP] parallel read

2 files changed, 9 insertions, 1 deletions

diff --git a/doc/extdev/appapi.rst b/doc/extdev/appapi.rst
index f9b43560..d65f91a5 100644
--- a/doc/extdev/appapi.rst
+++ b/doc/extdev/appapi.rst
@@ -442,7 +442,8 @@ handlers to the events.  Example:
    Emitted after the environment has determined the list of all added and
    changed files and just before it reads them.  It allows extension authors to
    reorder the list of docnames (*inplace*) before processing, or add more
-   docnames that Sphinx did not consider changed.
+   docnames that Sphinx did not consider changed (but never add any docnames
+   that are not in ``env.found_docs``).
 
    You can also remove document names; do this with caution since it will make
    Sphinx treat changed files as unchanged.
diff --git a/doc/extdev/index.rst b/doc/extdev/index.rst
index 481688ac..5144c5f8 100644
--- a/doc/extdev/index.rst
+++ b/doc/extdev/index.rst
@@ -33,6 +33,13 @@ as metadata of the extension.  Metadata keys currently recognized are:
 * ``'version'``: a string that identifies the extension version.  It is used for
   extension version requirement checking (see :confval:`needs_extensions`) and
   informational purposes.  If not given, ``"unknown version"`` is substituted.
+* ``'parallel_read_safe'``: a boolean that specifies if parallel reading of
+  source files can be used when the extension is loaded.  It defaults to
+  ``False``, i.e. you have to explicitly specify your extension to be
+  parallel-read-safe after checking that it is.
+* ``'parallel_write_safe'``: a boolean that specifies if parallel writing of
+  output files can be used when the extension is loaded.  Since extensions
+  usually don't negatively influence the process, this defaults to ``True``.
 
 APIs used for writing extensions
 --------------------------------