Library Version 18.1.40

Exclusive Database Handles
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## Exclusive Database Handles

Database handles can now be configured to allow exclusive access to the database. To enable exclusive access, call DB->set_lk_exclusive() before calling DB->open(). Set nowait_onoff to non-zero to have DB->open() return immediately, with the error `DB_LOCK_NOTGRANTED` if it cannot immediately get exclusive access to the database, and to 0 to have DB->open() block until it can gain exclusive access.

### New Functions

- DB->set_lk_exclusive()
- DB->get_lk_exclusive()

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