diff --git a/tpc/malloc2.13/arena.h b/tpc/malloc2.13/arena.h
index 2e74cdb05d86..6ac0635364af 100644
--- a/tpc/malloc2.13/arena.h
+++ b/tpc/malloc2.13/arena.h
@@ -782,3 +782,22 @@ static struct malloc_state *arena_get(size_t size)
 		arena = arena_get2(arena, size);
 	return arena;
 }
+
+static inline void arena_lock(struct malloc_state *arena)
+{
+#if THREAD_STATS
+	if(!mutex_trylock(&arena->mutex))
+		++(arena->stat_lock_direct);
+	else {
+		(void)mutex_lock(&arena->mutex);
+		++(arena->stat_lock_wait);
+	}
+#else
+	(void)mutex_lock(&arena->mutex);
+#endif
+}
+
+static inline void arena_unlock(struct malloc_state *arena)
+{
+	(void)mutex_unlock(&arena->mutex);
+}
diff --git a/tpc/malloc2.13/malloc.c b/tpc/malloc2.13/malloc.c
index 078b3eead789..9df824584745 100644
--- a/tpc/malloc2.13/malloc.c
+++ b/tpc/malloc2.13/malloc.c
@@ -3249,19 +3249,19 @@ mremap_chunk(mchunkptr p, size_t new_size)
 
 #endif /* HAVE_MREMAP */
 
-static struct malloc_state *get_backup_arena(struct malloc_state *ar_ptr, size_t bytes)
+static struct malloc_state *get_backup_arena(struct malloc_state *arena, size_t bytes)
 {
-	if (ar_ptr != &main_arena) {
+	if (arena != &main_arena) {
 		/* Maybe the failure is due to running out of mmapped areas. */
-		(void)mutex_unlock(&ar_ptr->mutex);
-		ar_ptr = &main_arena;
-		(void)mutex_lock(&ar_ptr->mutex);
+		arena_unlock(arena);
+		arena = &main_arena;
+		arena_lock(arena);
 	} else {
 		/* ... or sbrk() has failed and there is still a chance to mmap() */
-		ar_ptr = arena_get2(ar_ptr, bytes);
-		(void)mutex_unlock(&main_arena.mutex);
+		arena = arena_get2(arena, bytes);
+		arena_unlock(&main_arena);
 	}
-	return ar_ptr;
+	return arena;
 }
 
 /*------------------------ Public wrappers. --------------------------------*/
@@ -3284,7 +3284,7 @@ Void_t *public_mALLOc(size_t bytes)
 		ar_ptr = get_backup_arena(ar_ptr, bytes);
 		victim = _int_malloc(ar_ptr, bytes);
 	}
-	(void)mutex_unlock(&ar_ptr->mutex);
+	arena_unlock(ar_ptr);
 	assert(!victim || chunk_is_mmapped(mem2chunk(victim)) || ar_ptr == arena_for_chunk(mem2chunk(victim)));
 	return victim;
 }
@@ -3317,18 +3317,9 @@ public_fREe(Void_t* mem)
 #ifdef ATOMIC_FASTBINS
   _int_free(ar_ptr, p, 0);
 #else
-# if THREAD_STATS
-  if(!mutex_trylock(&ar_ptr->mutex))
-    ++(ar_ptr->stat_lock_direct);
-  else {
-    (void)mutex_lock(&ar_ptr->mutex);
-    ++(ar_ptr->stat_lock_wait);
-  }
-# else
-  (void)mutex_lock(&ar_ptr->mutex);
-# endif
+  arena_lock(ar_ptr);
   _int_free(ar_ptr, p);
-  (void)mutex_unlock(&ar_ptr->mutex);
+  arena_unlock(ar_ptr);
 #endif
 }
 
@@ -3389,16 +3380,7 @@ public_rEALLOc(Void_t* oldmem, size_t bytes)
   }
 
   ar_ptr = arena_for_chunk(oldp);
-#if THREAD_STATS
-  if(!mutex_trylock(&ar_ptr->mutex))
-    ++(ar_ptr->stat_lock_direct);
-  else {
-    (void)mutex_lock(&ar_ptr->mutex);
-    ++(ar_ptr->stat_lock_wait);
-  }
-#else
-  (void)mutex_lock(&ar_ptr->mutex);
-#endif
+  arena_lock(ar_ptr);
 
 #if !defined NO_THREADS
   /* As in malloc(), remember this arena for the next allocation. */
@@ -3407,7 +3389,7 @@ public_rEALLOc(Void_t* oldmem, size_t bytes)
 
   newp = _int_realloc(ar_ptr, oldp, oldsize, nb);
 
-  (void)mutex_unlock(&ar_ptr->mutex);
+  arena_unlock(ar_ptr);
   assert(!newp || chunk_is_mmapped(mem2chunk(newp)) ||
 	 ar_ptr == arena_for_chunk(mem2chunk(newp)));
 
@@ -3421,18 +3403,9 @@ public_rEALLOc(Void_t* oldmem, size_t bytes)
 #ifdef ATOMIC_FASTBINS
 	  _int_free(ar_ptr, oldp, 0);
 #else
-# if THREAD_STATS
-	  if(!mutex_trylock(&ar_ptr->mutex))
-	    ++(ar_ptr->stat_lock_direct);
-	  else {
-	    (void)mutex_lock(&ar_ptr->mutex);
-	    ++(ar_ptr->stat_lock_wait);
-	  }
-# else
-	  (void)mutex_lock(&ar_ptr->mutex);
-# endif
+	  arena_lock(ar_ptr);
 	  _int_free(ar_ptr, oldp);
-	  (void)mutex_unlock(&ar_ptr->mutex);
+	  arena_unlock(ar_ptr);
 #endif
 	}
     }
@@ -3465,7 +3438,7 @@ Void_t *public_mEMALIGn(size_t alignment, size_t bytes)
 		ar_ptr = get_backup_arena(ar_ptr, bytes);
 		p = _int_memalign(ar_ptr, alignment, bytes);
 	}
-	(void)mutex_unlock(&ar_ptr->mutex);
+	arena_unlock(ar_ptr);
 	assert(!p || chunk_is_mmapped(mem2chunk(p)) || ar_ptr == arena_for_chunk(mem2chunk(p)));
 	return p;
 }
@@ -3488,12 +3461,12 @@ Void_t *public_vALLOc(size_t bytes)
 	if (!ar_ptr)
 		return 0;
 	p = _int_valloc(ar_ptr, bytes);
-	(void)mutex_unlock(&ar_ptr->mutex);
+	arena_unlock(ar_ptr);
 	if (!p) {
 		ar_ptr = get_backup_arena(ar_ptr, bytes);
 		p = _int_memalign(ar_ptr, pagesz, bytes);
 	}
-	(void)mutex_unlock(&ar_ptr->mutex);
+	arena_unlock(ar_ptr);
 	assert(!p || chunk_is_mmapped(mem2chunk(p)) || ar_ptr == arena_for_chunk(mem2chunk(p)));
 
 	return p;
@@ -3517,12 +3490,11 @@ Void_t *public_pVALLOc(size_t bytes)
 
 	ar_ptr = arena_get(bytes + 2 * pagesz + MINSIZE);
 	p = _int_pvalloc(ar_ptr, bytes);
-	(void)mutex_unlock(&ar_ptr->mutex);
 	if (!p) {
 		ar_ptr = get_backup_arena(ar_ptr, bytes);
 		p = _int_memalign(ar_ptr, pagesz, rounded_bytes);
 	}
-	(void)mutex_unlock(&ar_ptr->mutex);
+	arena_unlock(ar_ptr);
 	assert(!p || chunk_is_mmapped(mem2chunk(p)) || ar_ptr == arena_for_chunk(mem2chunk(p)));
 
 	return p;
@@ -3591,7 +3563,7 @@ Void_t *public_cALLOc(size_t n, size_t elem_size)
 		av = get_backup_arena(av, bytes);
 		mem = _int_malloc(&main_arena, sz);
 	}
-	(void)mutex_unlock(&av->mutex);
+	arena_unlock(av);
 
 	assert(!mem || chunk_is_mmapped(mem2chunk(mem)) || av == arena_for_chunk(mem2chunk(mem)));
 	if (mem == 0)
@@ -3658,7 +3630,7 @@ public_iCALLOc(size_t n, size_t elem_size, Void_t** chunks)
     return 0;
 
   m = _int_icalloc(ar_ptr, n, elem_size, chunks);
-  (void)mutex_unlock(&ar_ptr->mutex);
+  arena_unlock(ar_ptr);
   return m;
 }
 
@@ -3673,7 +3645,7 @@ public_iCOMALLOc(size_t n, size_t sizes[], Void_t** chunks)
     return 0;
 
   m = _int_icomalloc(ar_ptr, n, sizes, chunks);
-  (void)mutex_unlock(&ar_ptr->mutex);
+  arena_unlock(ar_ptr);
   return m;
 }
 
@@ -3695,9 +3667,9 @@ public_mTRIm(size_t s)
   struct malloc_state * ar_ptr = &main_arena;
   do
     {
-      (void) mutex_lock (&ar_ptr->mutex);
+      arena_lock(ar_ptr);
       result |= mTRIm (ar_ptr, s);
-      (void) mutex_unlock (&ar_ptr->mutex);
+      arena_unlock(ar_ptr);
 
       ar_ptr = ar_ptr->next;
     }
@@ -3728,9 +3700,9 @@ struct mallinfo public_mALLINFo()
 
   if(__malloc_initialized < 0)
     ptmalloc_init ();
-  (void)mutex_lock(&main_arena.mutex);
+  arena_lock(&main_arena);
   m = mALLINFo(&main_arena);
-  (void)mutex_unlock(&main_arena.mutex);
+  arena_unlock(&main_arena);
   ret.arena = (int)m.arena;
   ret.ordblks = (int)m.ordblks;
   ret.smblks = (int)m.smblks;
@@ -4302,7 +4274,7 @@ _int_free(struct malloc_state * av, mchunkptr p)
     errout:
 #ifdef ATOMIC_FASTBINS
       if (! have_lock && locked)
-	(void)mutex_unlock(&av->mutex);
+	arena_unlock(av);
 #endif
       malloc_printerr (check_action, errstr, chunk2mem(p));
       return;
@@ -4342,7 +4314,7 @@ _int_free(struct malloc_state * av, mchunkptr p)
 	   after getting the lock.  */
 	if (have_lock
 	    || ({ assert (locked == 0);
-		  mutex_lock(&av->mutex);
+		  arena_lock*av);
 		  locked = 1;
 		  chunk_at_offset (p, size)->size <= 2 * SIZE_SZ
 		    || chunksize (chunk_at_offset (p, size)) >= av->system_mem;
@@ -4355,7 +4327,7 @@ _int_free(struct malloc_state * av, mchunkptr p)
 #ifdef ATOMIC_FASTBINS
 	if (! have_lock)
 	  {
-	    (void)mutex_unlock(&av->mutex);
+	    arena_unlock(av);
 	    locked = 0;
 	  }
 #endif
@@ -4419,16 +4391,7 @@ _int_free(struct malloc_state * av, mchunkptr p)
   else if (!chunk_is_mmapped(p)) {
 #ifdef ATOMIC_FASTBINS
     if (! have_lock) {
-# if THREAD_STATS
-      if(!mutex_trylock(&av->mutex))
-	++(av->stat_lock_direct);
-      else {
-	(void)mutex_lock(&av->mutex);
-	++(av->stat_lock_wait);
-      }
-# else
-      (void)mutex_lock(&av->mutex);
-# endif
+      arena_lock(av);
       locked = 1;
     }
 #endif
@@ -4564,7 +4527,7 @@ _int_free(struct malloc_state * av, mchunkptr p)
 #ifdef ATOMIC_FASTBINS
     if (! have_lock) {
       assert (locked);
-      (void)mutex_unlock(&av->mutex);
+      arena_unlock(av);
     }
 #endif
   }
@@ -5388,7 +5351,7 @@ void mSTATs()
   if(__malloc_initialized < 0)
     ptmalloc_init ();
   for (i=0, ar_ptr = &main_arena;; i++) {
-    (void)mutex_lock(&ar_ptr->mutex);
+    arena_lock(ar_ptr);
     mi = mALLINFo(ar_ptr);
     fprintf(stderr, "Arena %d:\n", i);
     fprintf(stderr, "system bytes     = %14lu\n", mi.arena);
@@ -5404,7 +5367,7 @@ void mSTATs()
     stat_lock_loop += ar_ptr->stat_lock_loop;
     stat_lock_wait += ar_ptr->stat_lock_wait;
 #endif
-    (void)mutex_unlock(&ar_ptr->mutex);
+    arena_unlock(ar_ptr);
     ar_ptr = ar_ptr->next;
     if(ar_ptr == &main_arena) break;
   }
@@ -5439,7 +5402,7 @@ int mALLOPt(int param_number, int value)
 
   if(__malloc_initialized < 0)
     ptmalloc_init ();
-  (void)mutex_lock(&av->mutex);
+  arena_lock(av);
   /* Ensure initialization/consolidation */
   malloc_consolidate(av);
 
@@ -5481,7 +5444,7 @@ int mALLOPt(int param_number, int value)
     break;
 
   }
-  (void)mutex_unlock(&av->mutex);
+  arena_unlock(av);
   return res;
 }
 
@@ -5736,7 +5699,7 @@ dlmalloc_info (int options, FILE *fp)
     } sizes[NFASTBINS + NBINS - 1];
 #define nsizes (sizeof (sizes) / sizeof (sizes[0]))
 
-    mutex_lock (&ar_ptr->mutex);
+    arena_lock(ar_ptr);
 
     for (size_t i = 0; i < NFASTBINS; ++i)
       {
@@ -5807,7 +5770,7 @@ dlmalloc_info (int options, FILE *fp)
 	avail += sizes[NFASTBINS - 1 + i].total;
       }
 
-    mutex_unlock (&ar_ptr->mutex);
+    arena_unlock(ar_ptr);
 
     total_nfastblocks += nfastblocks;
     total_fastavail += fastavail;
