Library Version 18.1.40

Minor Change in Behavior of DB_MPOOLFILE->get
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## Minor Change in Behavior of DB_MPOOLFILE->get

DB 4.8 introduces some performance enhancements, based on the use of shared/exclusive latches instead of locks in some areas of the internal buffer management code. This change will affect how the `DB_MPOOL` interface handles dirty buffers.

Because of these changes, `DB_MPOOLFILE->get` will now acquire an exclusive latch on the buffer if the `DB_MPOOL_DIRTY` or `DB_MPOOL_EDIT` flags are specified. This could lead to an application deadlock if the application tries to fetch the buffer again, without an intervening `DB_MPOOLFILE->put` call.

If your application uses the `DB_MPOOL` interface, and especially the `DB_MPOOL_DIRTY` and `DB_MPOOL_EDIT` flags, you should review your code to ensure that this behavior change does not cause your application to deadlock.

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