1 files changed, 84 insertions, 0 deletions
diff --git a/libgfortran/io/lock.c b/libgfortran/io/lock.c
new file mode 100644
index 00000000000..1d3f06912e0
--- /dev/null
+++ b/libgfortran/io/lock.c
@@ -0,0 +1,84 @@
+/* Thread/recursion locking
+   Copyright 2002 Free Software Foundation, Inc.
+   Contributed by Paul Brook <paul@nowt.org> and Andy Vaught
+
+This file is part of the GNU Fortran 95 runtime library (libgfor).
+
+Libgfor is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+Libgfor is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with libgfor; see the file COPYING.LIB.  If not,
+write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include "config.h"
+#include <string.h>
+#include "libgfortran.h"
+#include "io.h"
+
+st_parameter ioparm;
+namelist_info * ionml;
+global_t g;
+
+
+/* library_start()-- Called with a library call is entered.  */
+
+void
+library_start (void)
+{
+
+  if (g.in_library)
+    internal_error ("Recursive library calls not allowed");
+
+/* The in_library flag indicates whether we're currently processing a
+ * library call.  Some calls leave immediately, but READ and WRITE
+ * processing return control to the caller but are still considered to
+ * stay within the library. */
+
+  g.in_library = 1;
+
+  if (ioparm.iostat != NULL && ioparm.library_return == LIBRARY_OK)
+    *ioparm.iostat = ERROR_OK;
+
+  ioparm.library_return = LIBRARY_OK;
+}
+
+
+/* library_end()-- Called when a library call is complete in order to
+ * clean up for the next call. */
+
+void
+library_end (void)
+{
+  int t;
+  namelist_info * t1, *t2;
+
+  g.in_library = 0;
+  filename = NULL;
+  line = 0;
+
+  t = ioparm.library_return;
+  if (ionml != NULL)
+    {
+      t1 = ionml;
+      while (t1 != NULL)
+       {
+         t2 = t1;
+         t1 = t1->next;
+         free_mem (t2);
+       }
+    }
+  
+  ionml = NULL;
+  memset (&ioparm, '\0', sizeof (ioparm));
+  ioparm.library_return = t;
+}
+