Make full module name available as __module_name__ even when __name__ is set to something else (like '__main__')
diff --git a/Doc/lib/librunpy.tex b/Doc/lib/librunpy.tex
index c7a7e51..0bcfad2 100644
--- a/Doc/lib/librunpy.tex
+++ b/Doc/lib/librunpy.tex
@@ -35,16 +35,19 @@
global variables below are defined in the supplied dictionary, those
definitions are overridden by the \code{run_module} function.
-The special global variables \code{__name__}, \code{__file__},
-\code{__loader__} and \code{__builtins__} are set in the globals
-dictionary before the module code is executed.
+The special global variables \code{__name__}, \code{__module_name__},
+\code{__file__}, \code{__loader__} and \code{__builtins__} are
+set in the globals dictionary before the module code is executed.
\code{__name__} is set to \var{run_name} if this optional argument is
supplied, and the \var{mod_name} argument otherwise.
+\code{__module_name__} is always set to \var{mod_name} (this allows
+modules to use imports relative to their package name).
+
\code{__loader__} is set to the PEP 302 module loader used to retrieve
-the code for the module (This loader may be a wrapper around the
-standard import mechanism).
+the code for the module (This will not be defined if the module was
+found using the standard import mechanism).
\code{__file__} is set to the name provided by the module loader. If
the loader does not make filename information available, this
@@ -55,10 +58,12 @@
If the argument \var{alter_sys} is supplied and evaluates to
\code{True}, then \code{sys.argv[0]} is updated with the value of
-\code{__file__} and \code{sys.modules[__name__]} is updated with a
+\code{__file__} and \code{sys.modules[mod_name]} is updated with a
temporary module object for the module being executed. Both
-\code{sys.argv[0]} and \code{sys.modules[__name__]} are restored to
-their original values before the function returns.
+\code{sys.argv[0]} and \code{sys.modules[mod_name]} are restored to
+their original values before the function returns. If \var{run_name}
+differs from \var{mod_name} entries are made in \code{sys.modules}
+for both names.
Note that this manipulation of \module{sys} is not thread-safe. Other
threads may see the partially initialised module, as well as the