From: leo@yuriev.ru <leo@yuriev.ru>
Date: Fri, 3 Jul 2015 21:01:00 +0000 (+0200)
Subject: ITS#7969 Use __sync_synchronize()
X-Git-Tag: LMDB_0.9.17~83
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=086bc04cd2852753cc20eb812b9054eb545e3088;p=openldap

ITS#7969 Use __sync_synchronize()

The rest of 9a80a8a8e8feed56fbccd8851b8a789f7fff9c11
plus commit a937740aa0c47dc7a1a5e9be42dcea2dd3c81683.
---

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 797c67b32e..2ee0b6a149 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -3643,6 +3643,11 @@ mdb_env_write_meta(MDB_txn *txn)
 		mp->mm_dbs[0] = txn->mt_dbs[0];
 		mp->mm_dbs[1] = txn->mt_dbs[1];
 		mp->mm_last_pg = txn->mt_next_pgno - 1;
+#if (__GNUC__ * 100 + __GNUC_MINOR__ >= 404) && /* TODO: portability */	\
+	!(defined(__i386__) || defined(__x86_64__))
+		/* LY: issue a memory barrier, if not x86. ITS#7969 */
+		__sync_synchronize();
+#endif
 		mp->mm_txnid = txn->mt_txnid;
 		if (!(flags & (MDB_NOMETASYNC|MDB_NOSYNC))) {
 			unsigned meta_size = env->me_psize;