[sr-dev] git:master: tm: AS added needed membar

Module: sip-router Branch: master Commit: f0ab0db3b66fcc7912065ee960aff71615e9ce3e URL: http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=f0ab0db… Author: Andrei Pelinescu-Onciul <andrei(a)iptel.org> Committer: Andrei Pelinescu-Onciul <andrei(a)iptel.org> Date: Mon Jul 20 10:16:10 2009 +0200 tm: AS added needed membar When compiled with -DWITH_AS_SUPPORT build_local_ack() needed a membar_write_atomic_op() before setting the new local ack retr. buf pointer (this will force the local_ack content to be fully written before replacing the pointer and it's need on some non-x86 archs.). --- modules/tm/t_reply.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/modules/tm/t_reply.c b/modules/tm/t_reply.c index ba06cd1..ea5db73 100644 --- a/modules/tm/t_reply.c +++ b/modules/tm/t_reply.c @@ -414,6 +414,10 @@ static char *build_local_ack(struct sip_msg* rpl, struct cell *trans, } /* set the new buffer, but only if not already set (concurrent 2xx) */ + /* a memory write barrier is needed to make sure the local_ack + content is fully written, before we try to add it to the transaction + -- andrei */ + membar_write_atomic_op(); if ((old_lack = (struct retr_buf *)atomic_cmpxchg_long( (void *)&trans->uac[0].local_ack, 0, (long)local_ack))) { /* buffer already set: trash current and use the winning one */