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-rw-r--r--malloc/arena.c3
-rw-r--r--malloc/thread-m.h13
2 files changed, 15 insertions, 1 deletions
diff --git a/malloc/arena.c b/malloc/arena.c
index e47d3d0..fb7b92f 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -1,5 +1,5 @@
/* Malloc implementation for multiple threads without lock contention.
- Copyright (C) 2001, 2002 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Wolfram Gloger <wg@malloc.de>, 2001.
@@ -758,6 +758,7 @@ arena_get2(a_tsd, size) mstate a_tsd; size_t size;
/* Add the new arena to the global list. */
(void)mutex_lock(&list_lock);
a->next = main_arena.next;
+ atomic_write_barrier ();
main_arena.next = a;
(void)mutex_unlock(&list_lock);
diff --git a/malloc/thread-m.h b/malloc/thread-m.h
index da8bbf3..1dcaed0 100644
--- a/malloc/thread-m.h
+++ b/malloc/thread-m.h
@@ -31,6 +31,7 @@
#if defined(_LIBC) /* The GNU C library, a special case of Posix threads */
+#include <atomic.h>
#include <bits/libc-lock.h>
#ifdef PTHREAD_MUTEX_INITIALIZER
@@ -306,4 +307,16 @@ typedef void *tsd_key_t;
#endif /* defined(NO_THREADS) */
+#ifndef atomic_full_barrier
+# define atomic_full_barrier() __asm ("" ::: "memory")
+#endif
+
+#ifndef atomic_read_barrier
+# define atomic_read_barrier() atomic_full_barrier ()
+#endif
+
+#ifndef atomic_write_barrier
+# define atomic_write_barrier() atomic_full_barrier ()
+#endif
+
#endif /* !defined(_THREAD_M_H) */