From 7962541a32eff5597bc4207e781cfac8d1bb0d87 Mon Sep 17 00:00:00 2001
Message-Id: <7962541a32eff5597bc4207e781cfac8d1bb0d87.1450888146.git.fweimer@redhat.com>
From: Florian Weimer <fweimer@redhat.com>
Date: Wed, 23 Dec 2015 17:23:33 +0100
Subject: [PATCH] malloc: Update comment for list_lock
To: libc-alpha@sourceware.org
---
ChangeLog | 4 ++++
malloc/arena.c | 7 ++++---
2 files changed, 8 insertions(+), 3 deletions(-)
@@ -1,3 +1,7 @@
+2015-12-23 Florian Weimer <fweimer@redhat.com>
+
+ * malloc/arena.c (list_lock): Update comment.
+
2015-12-22 Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
* sysdeps/powerpc/hwcapinfo.c: Export symbol
@@ -85,9 +85,10 @@ static mstate free_list;
_int_new_arena. This suffers from data races; see the FIXME
comments in _int_new_arena and reused_arena.
- list_lock also prevents concurrent forks. When list_lock is
- acquired, no arena lock must be acquired, but it is permitted to
- acquire arena locks after list_lock. */
+ list_lock also prevents concurrent forks. At the time list_lock is
+ acquired, no arena lock must have been acquired, but it is
+ permitted to acquire arena locks subsequently, while list_lock is
+ acquired. */
static mutex_t list_lock = _LIBC_LOCK_INITIALIZER;
/* Mapped memory in non-main arenas (reliable only for NO_THREADS). */
--
2.4.3