ITS#7238 doc clarification

diff --git a/libraries/libmdb/mdb.c b/libraries/libmdb/mdb.c
index 724fdf1b2c6e6e2b452e6e33cc0a592a4d201160..46fd2683d7658e01f80a3aac1d533f1609dbad77 100644 (file)
--- a/libraries/libmdb/mdb.c
+++ b/libraries/libmdb/mdb.c
@@ -6277,6 +6277,9 @@ int mdb_drop(MDB_txn *txn, MDB_dbi dbi, int del)
        if (!txn || !dbi || dbi >= txn->mt_numdbs)
                return EINVAL;
 
+       if (F_ISSET(txn->mt_flags, MDB_TXN_RDONLY))
+               return EACCES;
+
        rc = mdb_cursor_open(txn, dbi, &mc);
        if (rc)
                return rc;

diff --git a/libraries/libmdb/mdb.h b/libraries/libmdb/mdb.h
index 6017ef58fa4468914e8724170cec82745199dd0d..fa6daf672b69129d18573aa53e098c26ce774fe8 100644 (file)
--- a/libraries/libmdb/mdb.h
+++ b/libraries/libmdb/mdb.h
@@ -490,8 +490,8 @@ int  mdb_env_set_maxdbs(MDB_env *env, MDB_dbi dbs);
        /** @brief Create a transaction for use with the environment.
         *
         * The transaction handle may be discarded using #mdb_txn_abort() or #mdb_txn_commit().
-        * @note Transactions may not span threads, a transaction must only be used by a
-        * single thread.
+        * @note Transactions may not span threads; a transaction must only be used by a
+        * single thread. Also, a thread may only have a single transaction.
         * @note Cursors may not span transactions; each cursor must be opened and closed
         * within a single transaction.
         * @param[in] env An environment handle returned by #mdb_env_create()
@@ -579,7 +579,7 @@ int  mdb_txn_renew(MDB_txn *txn);
        /** @brief Open a database in the environment.
         *
         * The database handle may be discarded by calling #mdb_close(). Only
-        * one thread should call this function; it is not mutex-protected in
+        * one thread at a time may call this function; it is not mutex-protected in
         * a read-only transaction.
         * @param[in] txn A transaction handle returned by #mdb_txn_begin()
         * @param[in] name The name of the database to open. If only a single