lmdb: is read operation permitted inside the write transaction?

Hello,

this might be a trivial question for you but I didn't find anything in the documentation nor any mention in the examples.

Basically I need to have an opportunity to call mdb_get while in write transaction. The sequence is smth like: - txn = mdb_txn_begin(flags=0) for i in 0..x: - v = mdb_get(txn, i) - mdb_put(txn, x+i, v) - mdb_put(txn, i, v+1) - mdb_txn_commit(txn)

Will it be always valid data? I'm running a stress test and didn't spot any issues so far. Though I might be extremely lucky today.

The DB is used in multi-threaded environment but the code illustrated above is protected with a mutex.

I tried to dig a bit into the lmdb internals but unfortunately didn't get any glue.

Thanks for your help, Dmytro