diff --git a/malloc/arena.c b/malloc/arena.c
index 4e16593..922ae49 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -112,7 +112,7 @@ int __malloc_initialized = -1;
 
 #define arena_lock(ptr, size) do {					      \
       if (ptr && !arena_is_corrupt (ptr))				      \
-        (void) mutex_lock (&ptr->mutex);				      \
+        __libc_lock_lock (ptr->mutex);				      \
       else								      \
         ptr = arena_get2 ((size), NULL);				      \
   } while (0)
@@ -145,11 +145,11 @@ __malloc_fork_lock_parent (void)
   /* We do not acquire free_list_lock here because we completely
      reconstruct free_list in __malloc_fork_unlock_child.  */
 
-  (void) mutex_lock (&list_lock);
+  __libc_lock_lock (list_lock);
 
   for (mstate ar_ptr = &main_arena;; )
     {
-      (void) mutex_lock (&ar_ptr->mutex);
+      __libc_lock_lock (ar_ptr->mutex);
       ar_ptr = ar_ptr->next;
       if (ar_ptr == &main_arena)
         break;
@@ -165,12 +165,12 @@ __malloc_fork_unlock_parent (void)
 
   for (mstate ar_ptr = &main_arena;; )
     {
-      (void) mutex_unlock (&ar_ptr->mutex);
+      __libc_lock_unlock (ar_ptr->mutex);
       ar_ptr = ar_ptr->next;
       if (ar_ptr == &main_arena)
         break;
     }
-  (void) mutex_unlock (&list_lock);
+  __libc_lock_unlock (list_lock);
 }
 
 void
@@ -182,13 +182,13 @@ __malloc_fork_unlock_child (void)
 
   /* Push all arenas to the free list, except thread_arena, which is
      attached to the current thread.  */
-  mutex_init (&free_list_lock);
+  __libc_lock_init (free_list_lock);
   if (thread_arena != NULL)
     thread_arena->attached_threads = 1;
   free_list = NULL;
   for (mstate ar_ptr = &main_arena;; )
     {
-      mutex_init (&ar_ptr->mutex);
+      __libc_lock_init (ar_ptr->mutex);
       if (ar_ptr != thread_arena)
         {
 	  /* This arena is no longer attached to any thread.  */
@@ -201,7 +201,7 @@ __malloc_fork_unlock_child (void)
         break;
     }
 
-  mutex_init (&list_lock);
+  __libc_lock_init (list_lock);
 }
 
 /* Initialization routine. */
@@ -668,9 +668,9 @@ _int_new_arena (size_t size)
   LIBC_PROBE (memory_arena_new, 2, a, size);
   mstate replaced_arena = thread_arena;
   thread_arena = a;
-  mutex_init (&a->mutex);
+  __libc_lock_init (a->mutex);
 
-  (void) mutex_lock (&list_lock);
+  __libc_lock_lock (list_lock);
 
   /* Add the new arena to the global list.  */
   a->next = main_arena.next;
@@ -680,11 +680,11 @@ _int_new_arena (size_t size)
   atomic_write_barrier ();
   main_arena.next = a;
 
-  (void) mutex_unlock (&list_lock);
+  __libc_lock_unlock (list_lock);
 
-  (void) mutex_lock (&free_list_lock);
+  __libc_lock_lock (free_list_lock);
   detach_arena (replaced_arena);
-  (void) mutex_unlock (&free_list_lock);
+  __libc_lock_unlock (free_list_lock);
 
   /* Lock this arena.  NB: Another thread may have been attached to
      this arena because the arena is now accessible from the
@@ -696,7 +696,7 @@ _int_new_arena (size_t size)
      but this could result in a deadlock with
      __malloc_fork_lock_parent.  */
 
-  (void) mutex_lock (&a->mutex);
+  __libc_lock_lock (a->mutex);
 
   return a;
 }
@@ -710,7 +710,7 @@ get_free_list (void)
   mstate result = free_list;
   if (result != NULL)
     {
-      (void) mutex_lock (&free_list_lock);
+      __libc_lock_lock (free_list_lock);
       result = free_list;
       if (result != NULL)
 	{
@@ -722,12 +722,12 @@ get_free_list (void)
 
 	  detach_arena (replaced_arena);
 	}
-      (void) mutex_unlock (&free_list_lock);
+      __libc_lock_unlock (free_list_lock);
 
       if (result != NULL)
         {
           LIBC_PROBE (memory_arena_reuse_free_list, 1, result);
-          (void) mutex_lock (&result->mutex);
+          __libc_lock_lock (result->mutex);
 	  thread_arena = result;
         }
     }
@@ -772,7 +772,7 @@ reused_arena (mstate avoid_arena)
   result = next_to_use;
   do
     {
-      if (!arena_is_corrupt (result) && !mutex_trylock (&result->mutex))
+      if (!arena_is_corrupt (result) && !__libc_lock_trylock (result->mutex))
         goto out;
 
       /* FIXME: This is a data race, see _int_new_arena.  */
@@ -799,14 +799,14 @@ reused_arena (mstate avoid_arena)
 
   /* No arena available without contention.  Wait for the next in line.  */
   LIBC_PROBE (memory_arena_reuse_wait, 3, &result->mutex, result, avoid_arena);
-  (void) mutex_lock (&result->mutex);
+  __libc_lock_lock (result->mutex);
 
 out:
   /* Attach the arena to the current thread.  */
   {
     /* Update the arena thread attachment counters.   */
     mstate replaced_arena = thread_arena;
-    (void) mutex_lock (&free_list_lock);
+    __libc_lock_lock (free_list_lock);
     detach_arena (replaced_arena);
 
     /* We may have picked up an arena on the free list.  We need to
@@ -821,7 +821,7 @@ out:
 
     ++result->attached_threads;
 
-    (void) mutex_unlock (&free_list_lock);
+    __libc_lock_unlock (free_list_lock);
   }
 
   LIBC_PROBE (memory_arena_reuse, 2, result, avoid_arena);
@@ -892,17 +892,17 @@ arena_get_retry (mstate ar_ptr, size_t bytes)
   LIBC_PROBE (memory_arena_retry, 2, bytes, ar_ptr);
   if (ar_ptr != &main_arena)
     {
-      (void) mutex_unlock (&ar_ptr->mutex);
+      __libc_lock_unlock (ar_ptr->mutex);
       /* Don't touch the main arena if it is corrupt.  */
       if (arena_is_corrupt (&main_arena))
 	return NULL;
 
       ar_ptr = &main_arena;
-      (void) mutex_lock (&ar_ptr->mutex);
+      __libc_lock_lock (ar_ptr->mutex);
     }
   else
     {
-      (void) mutex_unlock (&ar_ptr->mutex);
+      __libc_lock_unlock (ar_ptr->mutex);
       ar_ptr = arena_get2 (bytes, ar_ptr);
     }
 
@@ -917,7 +917,7 @@ arena_thread_freeres (void)
 
   if (a != NULL)
     {
-      (void) mutex_lock (&free_list_lock);
+      __libc_lock_lock (free_list_lock);
       /* If this was the last attached thread for this arena, put the
 	 arena on the free list.  */
       assert (a->attached_threads > 0);
@@ -926,7 +926,7 @@ arena_thread_freeres (void)
 	  a->next_free = free_list;
 	  free_list = a;
 	}
-      (void) mutex_unlock (&free_list_lock);
+      __libc_lock_unlock (free_list_lock);
     }
 }
 text_set_element (__libc_thread_subfreeres, arena_thread_freeres);
diff --git a/malloc/hooks.c b/malloc/hooks.c
index caa1e70..0fdcffd 100644
--- a/malloc/hooks.c
+++ b/malloc/hooks.c
@@ -291,9 +291,9 @@ malloc_check (size_t sz, const void *caller)
       return NULL;
     }
 
-  (void) mutex_lock (&main_arena.mutex);
+  __libc_lock_lock (main_arena.mutex);
   victim = (top_check () >= 0) ? _int_malloc (&main_arena, sz + 1) : NULL;
-  (void) mutex_unlock (&main_arena.mutex);
+  __libc_lock_unlock (main_arena.mutex);
   return mem2mem_check (victim, sz);
 }
 
@@ -305,11 +305,11 @@ free_check (void *mem, const void *caller)
   if (!mem)
     return;
 
-  (void) mutex_lock (&main_arena.mutex);
+  __libc_lock_lock (main_arena.mutex);
   p = mem2chunk_check (mem, NULL);
   if (!p)
     {
-      (void) mutex_unlock (&main_arena.mutex);
+      __libc_lock_unlock (main_arena.mutex);
 
       malloc_printerr (check_action, "free(): invalid pointer", mem,
 		       &main_arena);
@@ -317,12 +317,12 @@ free_check (void *mem, const void *caller)
     }
   if (chunk_is_mmapped (p))
     {
-      (void) mutex_unlock (&main_arena.mutex);
+      __libc_lock_unlock (main_arena.mutex);
       munmap_chunk (p);
       return;
     }
   _int_free (&main_arena, p, 1);
-  (void) mutex_unlock (&main_arena.mutex);
+  __libc_lock_unlock (main_arena.mutex);
 }
 
 static void *
@@ -345,9 +345,9 @@ realloc_check (void *oldmem, size_t bytes, const void *caller)
       free_check (oldmem, NULL);
       return NULL;
     }
-  (void) mutex_lock (&main_arena.mutex);
+  __libc_lock_lock (main_arena.mutex);
   const mchunkptr oldp = mem2chunk_check (oldmem, &magic_p);
-  (void) mutex_unlock (&main_arena.mutex);
+  __libc_lock_unlock (main_arena.mutex);
   if (!oldp)
     {
       malloc_printerr (check_action, "realloc(): invalid pointer", oldmem,
@@ -357,7 +357,7 @@ realloc_check (void *oldmem, size_t bytes, const void *caller)
   const INTERNAL_SIZE_T oldsize = chunksize (oldp);
 
   checked_request2size (bytes + 1, nb);
-  (void) mutex_lock (&main_arena.mutex);
+  __libc_lock_lock (main_arena.mutex);
 
   if (chunk_is_mmapped (oldp))
     {
@@ -400,7 +400,7 @@ realloc_check (void *oldmem, size_t bytes, const void *caller)
   if (newmem == NULL)
     *magic_p ^= 0xFF;
 
-  (void) mutex_unlock (&main_arena.mutex);
+  __libc_lock_unlock (main_arena.mutex);
 
   return mem2mem_check (newmem, bytes);
 }
@@ -440,10 +440,10 @@ memalign_check (size_t alignment, size_t bytes, const void *caller)
       alignment = a;
     }
 
-  (void) mutex_lock (&main_arena.mutex);
+  __libc_lock_lock (main_arena.mutex);
   mem = (top_check () >= 0) ? _int_memalign (&main_arena, alignment, bytes + 1) :
         NULL;
-  (void) mutex_unlock (&main_arena.mutex);
+  __libc_lock_unlock (main_arena.mutex);
   return mem2mem_check (mem, bytes);
 }
 
@@ -503,7 +503,7 @@ __malloc_get_state (void)
   if (!ms)
     return 0;
 
-  (void) mutex_lock (&main_arena.mutex);
+  __libc_lock_lock (main_arena.mutex);
   malloc_consolidate (&main_arena);
   ms->magic = MALLOC_STATE_MAGIC;
   ms->version = MALLOC_STATE_VERSION;
@@ -540,7 +540,7 @@ __malloc_get_state (void)
   ms->arena_test = mp_.arena_test;
   ms->arena_max = mp_.arena_max;
   ms->narenas = narenas;
-  (void) mutex_unlock (&main_arena.mutex);
+  __libc_lock_unlock (main_arena.mutex);
   return (void *) ms;
 }
 
diff --git a/malloc/malloc.c b/malloc/malloc.c
index bb52b3e..20acb73 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -2870,7 +2870,7 @@ __libc_malloc (size_t bytes)
     }
 
   if (ar_ptr != NULL)
-    (void) mutex_unlock (&ar_ptr->mutex);
+    __libc_lock_unlock (ar_ptr->mutex);
 
   assert (!victim || chunk_is_mmapped (mem2chunk (victim)) ||
           ar_ptr == arena_for_chunk (mem2chunk (victim)));
@@ -3012,11 +3012,11 @@ __libc_realloc (void *oldmem, size_t bytes)
       return newmem;
     }
 
-  (void) mutex_lock (&ar_ptr->mutex);
+  __libc_lock_lock (ar_ptr->mutex);
 
   newp = _int_realloc (ar_ptr, oldp, oldsize, nb);
 
-  (void) mutex_unlock (&ar_ptr->mutex);
+  __libc_lock_unlock (ar_ptr->mutex);
   assert (!newp || chunk_is_mmapped (mem2chunk (newp)) ||
           ar_ptr == arena_for_chunk (mem2chunk (newp)));
 
@@ -3098,7 +3098,7 @@ _mid_memalign (size_t alignment, size_t bytes, void *address)
     }
 
   if (ar_ptr != NULL)
-    (void) mutex_unlock (&ar_ptr->mutex);
+    __libc_lock_unlock (ar_ptr->mutex);
 
   assert (!p || chunk_is_mmapped (mem2chunk (p)) ||
           ar_ptr == arena_for_chunk (mem2chunk (p)));
@@ -3219,7 +3219,7 @@ __libc_calloc (size_t n, size_t elem_size)
     }
 
   if (av != NULL)
-    (void) mutex_unlock (&av->mutex);
+    __libc_lock_unlock (av->mutex);
 
   /* Allocation failed even after a retry.  */
   if (mem == 0)
@@ -3835,7 +3835,7 @@ _int_free (mstate av, mchunkptr p, int have_lock)
       errstr = "free(): invalid pointer";
     errout:
       if (!have_lock && locked)
-        (void) mutex_unlock (&av->mutex);
+        __libc_lock_unlock (av->mutex);
       malloc_printerr (check_action, errstr, chunk2mem (p), av);
       return;
     }
@@ -3874,7 +3874,7 @@ _int_free (mstate av, mchunkptr p, int have_lock)
 	   after getting the lock.  */
 	if (have_lock
 	    || ({ assert (locked == 0);
-		  mutex_lock(&av->mutex);
+		  __libc_lock_lock (av->mutex);
 		  locked = 1;
 		  chunk_at_offset (p, size)->size <= 2 * SIZE_SZ
 		    || chunksize (chunk_at_offset (p, size)) >= av->system_mem;
@@ -3885,7 +3885,7 @@ _int_free (mstate av, mchunkptr p, int have_lock)
 	  }
 	if (! have_lock)
 	  {
-	    (void)mutex_unlock(&av->mutex);
+	    __libc_lock_unlock (av->mutex);
 	    locked = 0;
 	  }
       }
@@ -3931,7 +3931,7 @@ _int_free (mstate av, mchunkptr p, int have_lock)
 
   else if (!chunk_is_mmapped(p)) {
     if (! have_lock) {
-      (void)mutex_lock(&av->mutex);
+      __libc_lock_lock (av->mutex);
       locked = 1;
     }
 
@@ -4064,7 +4064,7 @@ _int_free (mstate av, mchunkptr p, int have_lock)
 
     if (! have_lock) {
       assert (locked);
-      (void)mutex_unlock(&av->mutex);
+      __libc_lock_unlock (av->mutex);
     }
   }
   /*
@@ -4531,9 +4531,9 @@ __malloc_trim (size_t s)
   mstate ar_ptr = &main_arena;
   do
     {
-      (void) mutex_lock (&ar_ptr->mutex);
+      __libc_lock_lock (ar_ptr->mutex);
       result |= mtrim (ar_ptr, s);
-      (void) mutex_unlock (&ar_ptr->mutex);
+      __libc_lock_unlock (ar_ptr->mutex);
 
       ar_ptr = ar_ptr->next;
     }
@@ -4662,9 +4662,9 @@ __libc_mallinfo (void)
   ar_ptr = &main_arena;
   do
     {
-      (void) mutex_lock (&ar_ptr->mutex);
+      __libc_lock_lock (ar_ptr->mutex);
       int_mallinfo (ar_ptr, &m);
-      (void) mutex_unlock (&ar_ptr->mutex);
+      __libc_lock_unlock (ar_ptr->mutex);
 
       ar_ptr = ar_ptr->next;
     }
@@ -4694,7 +4694,7 @@ __malloc_stats (void)
       struct mallinfo mi;
 
       memset (&mi, 0, sizeof (mi));
-      (void) mutex_lock (&ar_ptr->mutex);
+      __libc_lock_lock (ar_ptr->mutex);
       int_mallinfo (ar_ptr, &mi);
       fprintf (stderr, "Arena %d:\n", i);
       fprintf (stderr, "system bytes     = %10u\n", (unsigned int) mi.arena);
@@ -4705,7 +4705,7 @@ __malloc_stats (void)
 #endif
       system_b += mi.arena;
       in_use_b += mi.uordblks;
-      (void) mutex_unlock (&ar_ptr->mutex);
+      __libc_lock_unlock (ar_ptr->mutex);
       ar_ptr = ar_ptr->next;
       if (ar_ptr == &main_arena)
         break;
@@ -4733,7 +4733,7 @@ __libc_mallopt (int param_number, int value)
 
   if (__malloc_initialized < 0)
     ptmalloc_init ();
-  (void) mutex_lock (&av->mutex);
+  __libc_lock_lock (av->mutex);
   /* Ensure initialization/consolidation */
   malloc_consolidate (av);
 
@@ -4811,7 +4811,7 @@ __libc_mallopt (int param_number, int value)
         }
       break;
     }
-  (void) mutex_unlock (&av->mutex);
+  __libc_lock_unlock (av->mutex);
   return res;
 }
 libc_hidden_def (__libc_mallopt)
@@ -5058,7 +5058,7 @@ __malloc_info (int options, FILE *fp)
       } sizes[NFASTBINS + NBINS - 1];
 #define nsizes (sizeof (sizes) / sizeof (sizes[0]))
 
-      mutex_lock (&ar_ptr->mutex);
+      __libc_lock_lock (ar_ptr->mutex);
 
       for (size_t i = 0; i < NFASTBINS; ++i)
 	{
@@ -5117,7 +5117,7 @@ __malloc_info (int options, FILE *fp)
 	  avail += sizes[NFASTBINS - 1 + i].total;
 	}
 
-      mutex_unlock (&ar_ptr->mutex);
+      __libc_lock_unlock (ar_ptr->mutex);
 
       total_nfastblocks += nfastblocks;
       total_fastavail += fastavail;
