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mdbx: avoid tsan-trap in mdb_txn_renew0() by me_live_reader.

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Change-Id: I70f173d3e77c9cc84881c86e8fc64ae2a4906f0b
This commit is contained in:
Leo Yuriev 2015-12-07 19:37:00 +03:00
parent f38bb9621f
commit 24449c2a07
1 changed files with 10 additions and 7 deletions
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17
mdb.c
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@ -2773,16 +2773,19 @@ mdb_txn_renew0(MDB_txn *txn, unsigned flags)
pthread_t tid = pthread_self();
pthread_mutex_t *rmutex = MDB_MUTEX(env, r);
if (unlikely(!env->me_live_reader)) {
rc = mdb_reader_pid(env, F_SETLK, pid);
if (unlikely(rc != MDB_SUCCESS))
return rc;
env->me_live_reader = 1;
}
rc = mdb_mutex_lock(env, rmutex);
if (unlikely(rc != MDB_SUCCESS))
return rc;
if (unlikely(!env->me_live_reader)) {
rc = mdb_reader_pid(env, F_SETLK, pid);
if (unlikely(rc != MDB_SUCCESS)) {
mdb_mutex_unlock(env, rmutex);
return rc;
}
env->me_live_reader = 1;
}
nr = env->me_txns->mti_numreaders;
for (i=0; i<nr; i++)
if (env->me_txns->mti_readers[i].mr_pid == 0)