Cleanup from patch #683257:

 Add missing INCREFs and re-indent returns to be consistent.
 Add \n\ for lines in docstring
 Add a pathetic test
 Add docs

1 files changed, 13 insertions, 0 deletions

diff --git a/Doc/lib/libimp.tex b/Doc/lib/libimp.tex
index 150f5b4..31368f4 100644
--- a/Doc/lib/libimp.tex
+++ b/Doc/lib/libimp.tex
@@ -106,6 +106,19 @@ the process of completing its import (and the imports, if any,
 triggered by that).
 \end{funcdesc}
 
+\begin{funcdesc}{acquire_lock}{}
+Acquires the interpreter's import lock for the current thread.  This lock
+should be used by import hooks to ensure thread-safety when importing modules.
+On platforms without threads, this function does nothing.
+\versionadded{2.3}
+\end{funcdesc}
+
+\begin{funcdesc}{release_lock}{}
+Release the interpreter's import lock.
+On platforms without threads, this function does nothing.
+\versionadded{2.3}
+\end{funcdesc}
+
 The following constants with integer values, defined in this module,
 are used to indicate the search result of \function{find_module()}.