diff --git a/ChangeLog b/ChangeLog
index 1006a07534..9b5bc4288b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2001-08-21  Ulrich Drepper  <drepper@redhat.com>
+
+	* string/bits/string2.h: Remove strnlen optimization here.
+	* sysdeps/i386/i486/bits/string.h: Add it here.
+
+2001-08-21  Wolfram Gloger  <wg@malloc.de>
+
+	* malloc/malloc.c: Make access to ..._hook pointers thread-safe.
+
 2001-08-21  Ulrich Drepper  <drepper@redhat.com>
 
 	* po/gl.po: Update from translation team.
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 92de6e44e9..6722ac41c0 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -2788,13 +2788,15 @@ Void_t* mALLOc(bytes) size_t bytes;
   mchunkptr victim;
 
 #if defined _LIBC || defined MALLOC_HOOKS
-  if (__malloc_hook != NULL) {
+  __malloc_ptr_t (*hook) __MALLOC_PMT ((size_t, __const __malloc_ptr_t)) =
+      __malloc_hook;
+  if (hook != NULL) {
     Void_t* result;
 
 #if defined __GNUC__ && __GNUC__ >= 2
-    result = (*__malloc_hook)(bytes, RETURN_ADDRESS (0));
+    result = (*hook)(bytes, RETURN_ADDRESS (0));
 #else
-    result = (*__malloc_hook)(bytes, NULL);
+    result = (*hook)(bytes, NULL);
 #endif
     return result;
   }
@@ -3111,11 +3113,14 @@ void fREe(mem) Void_t* mem;
   mchunkptr p;                          /* chunk corresponding to mem */
 
 #if defined _LIBC || defined MALLOC_HOOKS
-  if (__free_hook != NULL) {
+  void (*hook) __MALLOC_PMT ((__malloc_ptr_t, __const __malloc_ptr_t)) =
+    __free_hook;
+
+  if (hook != NULL) {
 #if defined __GNUC__ && __GNUC__ >= 2
-    (*__free_hook)(mem, RETURN_ADDRESS (0));
+    (*hook)(mem, RETURN_ADDRESS (0));
 #else
-    (*__free_hook)(mem, NULL);
+    (*hook)(mem, NULL);
 #endif
     return;
   }
@@ -3314,13 +3319,16 @@ Void_t* rEALLOc(oldmem, bytes) Void_t* oldmem; size_t bytes;
   mchunkptr newp;             /* chunk to return */
 
 #if defined _LIBC || defined MALLOC_HOOKS
-  if (__realloc_hook != NULL) {
+  __malloc_ptr_t (*hook) __MALLOC_PMT ((__malloc_ptr_t, size_t,
+                                        __const __malloc_ptr_t)) =
+    __realloc_hook;
+  if (hook != NULL) {
     Void_t* result;
 
 #if defined __GNUC__ && __GNUC__ >= 2
-    result = (*__realloc_hook)(oldmem, bytes, RETURN_ADDRESS (0));
+    result = (*hook)(oldmem, bytes, RETURN_ADDRESS (0));
 #else
-    result = (*__realloc_hook)(oldmem, bytes, NULL);
+    result = (*hook)(oldmem, bytes, NULL);
 #endif
     return result;
   }
@@ -3596,13 +3604,16 @@ Void_t* mEMALIGn(alignment, bytes) size_t alignment; size_t bytes;
   mchunkptr p;
 
 #if defined _LIBC || defined MALLOC_HOOKS
-  if (__memalign_hook != NULL) {
+  __malloc_ptr_t (*hook) __MALLOC_PMT ((size_t, size_t,
+                                        __const __malloc_ptr_t)) =
+    __memalign_hook;
+  if (hook != NULL) {
     Void_t* result;
 
 #if defined __GNUC__ && __GNUC__ >= 2
-    result = (*__memalign_hook)(alignment, bytes, RETURN_ADDRESS (0));
+    result = (*hook)(alignment, bytes, RETURN_ADDRESS (0));
 #else
-    result = (*__memalign_hook)(alignment, bytes, NULL);
+    result = (*hook)(alignment, bytes, NULL);
 #endif
     return result;
   }
@@ -3788,12 +3799,14 @@ Void_t* cALLOc(n, elem_size) size_t n; size_t elem_size;
   Void_t* mem;
 
 #if defined _LIBC || defined MALLOC_HOOKS
-  if (__malloc_hook != NULL) {
+  __malloc_ptr_t (*hook) __MALLOC_PMT ((size_t, __const __malloc_ptr_t)) =
+    __malloc_hook;
+  if (hook != NULL) {
     sz = n * elem_size;
 #if defined __GNUC__ && __GNUC__ >= 2
-    mem = (*__malloc_hook)(sz, RETURN_ADDRESS (0));
+    mem = (*hook)(sz, RETURN_ADDRESS (0));
 #else
-    mem = (*__malloc_hook)(sz, NULL);
+    mem = (*hook)(sz, NULL);
 #endif
     if(mem == 0)
       return 0;
diff --git a/string/bits/string2.h b/string/bits/string2.h
index 213ab2e516..1caa81b403 100644
--- a/string/bits/string2.h
+++ b/string/bits/string2.h
@@ -1021,18 +1021,6 @@ __strpbrk_c3 (__const char *__s, int __accept1, int __accept2,
 #endif
 
 
-#if defined __USE_GNU && !defined _FORCE_INLINES
-# ifndef _HAVE_STRING_ARCH_strnlen
-__STRING_INLINE size_t
-strnlen (__const char *__string, size_t __maxlen)
-{
-  __const char *__end = (__const char *) memchr (__string, '\0', __maxlen);
-  return __end ? (size_t) (__end - __string) : __maxlen;
-}
-# endif
-#endif
-
-
 #ifndef _HAVE_STRING_ARCH_strtok_r
 # define __strtok_r(s, sep, nextp) \
   (__extension__ (__builtin_constant_p (sep) && __string2_1bptr_p (sep)	      \
diff --git a/sysdeps/i386/i486/bits/string.h b/sysdeps/i386/i486/bits/string.h
index a21fc8b830..bbe39adab7 100644
--- a/sysdeps/i386/i486/bits/string.h
+++ b/sysdeps/i386/i486/bits/string.h
@@ -1,5 +1,5 @@
 /* Optimized, inlined string functions.  i486 version.
-   Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -540,6 +540,18 @@ __strlen_g (__const char *__str)
 }
 
 
+
+#if defined __USE_GNU
+#define _HAVE_STRING_ARCH_strnlen	1
+__STRING_INLINE size_t
+strnlen (__const char *__string, size_t __maxlen)
+{
+  __const char *__end = (__const char *) memchr (__string, '\0', __maxlen);
+  return __end ? (size_t) (__end - __string) : __maxlen;
+}
+#endif
+
+
 /* Copy SRC to DEST.  */
 #define _HAVE_STRING_ARCH_strcpy 1
 #define strcpy(dest, src) \