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ITS#7969 Use __sync_synchronize()

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The rest of 9a80a8a8e8feed56fbccd8851b8a789f7fff9c11
plus commit a937740aa0c47dc7a1a5e9be42dcea2dd3c81683.
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leo@yuriev.ru 2015-07-03 23:01:00 +02:00 committed by Hallvard Furuseth
parent 3f6fa7aece
commit 086bc04cd2
1 changed files with 5 additions and 0 deletions
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5
libraries/liblmdb/mdb.c
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@ -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;