// must be called under an environment and parent lock
DbRetVal TxnBegin(DB_TXN* parxp, Txn txn, Txn.BeginFlags flags) {
DbRetVal ret;
RuntimeHelpers.PrepareConstrainedRegions();
try { }
finally {
DB_TXN* txp;
DB_ENV* evp = CheckDisposed();
ret = evp->TxnBegin(evp, parxp, out txp, unchecked((UInt32)flags));
if (ret == DbRetVal.SUCCESS) {
txn.Initialize(txp);
transactions.Insert(txn);
}
}
return ret;
}
public Txn CdsGroupBegin() {
Txn txn = new Txn(this);
DbRetVal ret;
lock (rscLock) {
RuntimeHelpers.PrepareConstrainedRegions();
try { }
finally {
DB_TXN* txp;
DB_ENV* evp = CheckDisposed();
ret = evp->CdsGroupBegin(evp, out txp);
if (ret == DbRetVal.SUCCESS) {
txn.Initialize(txp);
transactions.Insert(txn);
}
}
}
Util.CheckRetVal(ret);
return txn;
}
