* sysdeps/generic/ldsodefs.h (_dl_load_lock): Declare it here with

	__libc_lock_define_recursive.
	* elf/dl-open.c: Don't declare it here any more.
	* elf/dl-close.c: Likewise.
	* elf/dl-lookup.c: Likewise.
	* elf/dl-iteratephdr.c: Likewise.
	* elf/dl-lookup.c (add_dependency): Use __libc_lock_lock_recursive and
	__libc_lock_unlock_recursive.
	* elf/dl-close.c (_dl_close): Likewise
	* elf/dl-iteratephdr.c (__dl_iterate_phdr): Likewise
	* elf/dl-open.c (_dl_open): Likewise

	* sysdeps/generic/bits/libc-lock.h
	(__libc_lock_define_recursive): New macro.
	* sysdeps/generic/bits/stdio-lock.h (_IO_lock_t): Use it.
	(_IO_lock_lock): Use __libc_lock_lock_recursive.
	(_IO_lock_unlock): Use __libc_lock_unlock_recursive.

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.  */