--- a/src/ChangeLog	Thu Feb 13 05:52:16 2003 +0000
+++ b/src/ChangeLog	Thu Feb 13 21:03:04 2003 +0000
@@ -1,3 +1,12 @@
+2003-02-13  Paul Kienzle <pkienzle@users.sf.net>
+
+	* variables.cc (Fmlock, Fmunlock, Fmislocked): New functions.
+
+	* variables.cc (mlock, munlock, mislocked): New functions.
+	* variables.h: Provide decls.
+
+	* symtab.h (symbol_record::unmark_static): New function.
+
 2003-02-12  John W. Eaton  <jwe@bevo.che.wisc.edu>
 
 	* error.cc (reset_error_handler): New function.

--- a/src/symtab.h	Thu Feb 13 05:52:16 2003 +0000
+++ b/src/symtab.h	Thu Feb 13 21:03:04 2003 +0000
@@ -323,6 +323,7 @@
 
   void mark_as_static (void);
   bool is_static (void) const { return tagged_static; }
+  void unmark_static (void) { tagged_static = false; }
 
   int rows (void) const { return definition->rows (); }
   int columns (void) const { return definition->columns (); }

--- a/src/variables.cc	Thu Feb 13 05:52:16 2003 +0000
+++ b/src/variables.cc	Thu Feb 13 21:03:04 2003 +0000
@@ -1290,6 +1290,131 @@
   sr->document (help);
 }
 
+void 
+mlock (const std::string& nm)
+{
+  symbol_record *sr = fbi_sym_tab->lookup (nm, true);
+
+  if (sr)
+    sr->mark_as_static ();
+}
+
+void 
+munlock (const std::string& nm)
+{
+  symbol_record *sr = fbi_sym_tab->lookup (nm);
+
+  if (sr && sr->is_static ())
+    sr->unmark_static ();
+  else
+    error ("munlock: %s is not locked", nm.c_str ());
+}
+
+bool
+mislocked (const std::string& nm)
+{
+  symbol_record *sr = fbi_sym_tab->lookup (nm);
+
+  return (sr && sr->is_static ());
+}
+
+DEFCMD (mlock, args, ,
+  "-*- texinfo -*-\n\
+@deftypefnx {Built-in Function} {} mlock (@var{name})\n\
+Lock the named function into memory.  If no function is named\n\
+then lock in the current function.\n\
+@end deftypefn\n\
+@seealso{munlock, mislocked, and persistent}")
+{
+  octave_value_list retval;
+
+  if (args.length () == 1)
+    {
+      std::string name = args(0).string_value ();
+
+      if (! error_state)
+	mlock (name);
+      else
+	error ("mlock: expecting argument to be a function name");
+    }
+  else if (args.length () == 0)
+    {
+      if (curr_function)
+        mlock (curr_function->function_name ());
+      else
+        error ("mlock: invalid use outside a function");
+    }
+  else
+    print_usage ("mlock");
+
+  return retval;
+}
+
+DEFCMD (munlock, args, ,
+  "-*- texinfo -*-\n\
+@deftypefn {Built-in Function} {} munlock (@var{fcn})\n\
+Unlock the named function.  If no function is named\n\
+then unlock the current function.\n\
+@end deftypefn\n\
+@seealso{mlock, mislocked, and persistent}")
+{
+  octave_value_list retval;
+
+  if (args.length() == 1)
+    {
+      std::string name = args(0).string_value ();
+
+      if (! error_state)
+        munlock (name);
+      else
+	error ("munlock: expecting argument to be a function name");
+    }
+  else if (args.length () == 0)
+    {
+      if (curr_function)
+        mlock (curr_function->function_name ());
+      else
+        error ("munlock: invalid use outside a function");
+    }
+  else
+    print_usage ("munlock");
+
+  return retval;
+}
+
+
+DEFCMD (mislocked, args, ,
+  "-*- texinfo -*-\n\
+@deftypefn {Built-in Function} {} mislocked (@var{fcn})\n\
+Return true if the named function is locked.  If no function is named\n\
+then return true if the current function is locked.\n\
+@end deftypefn\n\
+@seealso{mlock, munlock, and persistent}")
+{
+  octave_value retval;
+
+  if (args.length() == 1)
+    {
+      std::string name = args(0).string_value ();
+
+      if (! error_state)
+        retval = mislocked (name);
+      else
+	error ("mislocked: expecting argument to be a function name");
+    }
+  else if (args.length () == 0)
+    {
+      if (curr_function)
+        retval = mislocked (curr_function->function_name ());
+      else
+        error ("mislocked: invalid use outside a function");
+    }
+  else
+    print_usage ("mislocked");
+
+  return retval;
+}
+
 // Deleting names from the symbol tables.
 
 static inline bool

--- a/src/variables.h	Thu Feb 13 05:52:16 2003 +0000
+++ b/src/variables.h	Thu Feb 13 21:03:04 2003 +0000
@@ -71,6 +71,10 @@
 extern bool
 looks_like_struct (const std::string& text);
 
+extern int
+symbol_exist (const std::string& name,
+	      const std::string& type = std::string ());
+
 extern bool lookup (symbol_record *s, bool exec_script = true);
 
 extern symbol_record *
@@ -106,9 +110,9 @@
 		       symbol_record::change_function f = 0,
 		       const std::string& help = std::string ());
 
-extern int
-symbol_exist (const std::string& name,
-	      const std::string& type = std::string ());
+extern void mlock (const std::string&);
+extern void munlock (const std::string&);
+extern bool mislocked (const std::string&);
 
 // Symbol table for symbols at the top level.
 extern symbol_table *top_level_sym_tab;