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New WiredTigerSessionCache::waitUntilPreparedUnitOfWorkCommitsOrAborts and WiredTigerSessionCache::notifyPreparedUnitOfWorkHasCommittedOrAborted methods:
/**
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* Block until any prepared transaction has either committed or aborted.
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* Can be interrupted.
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*/
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WiredTigerSessionCache::waitUntilUnpreparedUnitOfWorkCommitsOrAborts(OperationContext* opCtx);
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/**
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* Notify that a prepared transaction has either committed or aborted.
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*/
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WiredTigerSessionCache::notifyPreparedUnitOfWorkHasCommittedOrAborted(OperationContext* opCtx);
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These use a condvar/mutex and OperationContext::waitForConditionOrInterrupt, so the wait is interruptible.
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