Library Version 12.1.6.2

Failchk Broadcast Notifications
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## Failchk Broadcast Notifications

The DB_ENV->failchk() method now has a new option to notify environment processes of an application failure as soon as possible. This option causes any thread waiting on a mutex owned by a crashed process to return DB_RUNRECOVERY instead of hanging.

This option is enabled at compile time with the new configure option --enable-failchk_broadcast. When enabled, this option provides a new timeout. It also provides new events that notify the application when a thread is about to return DB_RUNRECOVERY.

### New Parameter Value

- DB_SET_MUTEX_FAILCHK_TIMEOUT — A new `timeout` parameter value for the DB_ENV->set_timeout() method to indicate how long a thread will wait for a mutex lock before checking whether DB_ENV->failchk() has marked the mutex as failed.

### New Events

- DB_EVENT_FAILCHK_PANIC
- DB_EVENT_MUTEX_DIED

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