1 files changed, 11 insertions, 0 deletions
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index a98b01a6a7..6d196c7379 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -31,6 +31,7 @@
 #include <dlfcn.h>
 #include <link.h>
 #include <dl-lookupcfg.h>
+#include <bits/libc-lock.h>
 
 __BEGIN_DECLS
 
@@ -229,6 +230,16 @@ extern struct r_search_path_elem *_dl_init_all_dirs;
 extern int _dl_sysdep_open_zero_fill (void); /* dl-sysdep.c */
 
 
+/* During the program run we must not modify the global data of
+   loaded shared object simultanously in two threads.  Therefore we
+   protect `_dl_open' and `_dl_close' in dl-close.c.
+
+   This must be a recursive lock since the initializer function of
+   the loaded object might as well require a call to this function.
+   At this time it is not anymore a problem to modify the tables.  */
+__libc_lock_define_recursive (extern, _dl_load_lock)
+
+
 /* Write message on the debug file descriptor.  The parameters are
    interpreted as for a `printf' call.  All the lines start with a
    tag showing the PID.  */