Function tikv::storage::txn::actions::prewrite::async_commit_timestamps

fn async_commit_timestamps(
    key: &Key, 
    lock: &mut Lock, 
    start_ts: TimeStamp, 
    for_update_ts: TimeStamp, 
    max_commit_ts: TimeStamp, 
    txn: &mut MvccTxn
) -> Result<TimeStamp>