Mailbox::dismissDeletedUidMessages

public function dismissDeletedUidMessages()
{
	global $DB;

	$startTime = time();

	if (time() - $this->mailbox['SYNC_LOCK'] < static::getTimeout())
	{
		return false;
	}

	if ($this->isTimeQuotaExceeded())
	{
		return false;
	}

	$syncUnlock = $this->mailbox['SYNC_LOCK'];

	$lockSql = sprintf(
		'UPDATE b_mail_mailbox SET SYNC_LOCK = %u WHERE ID = %u AND (SYNC_LOCK IS NULL OR SYNC_LOCK < %u)',
		$startTime, $this->mailbox['ID'], $startTime - static::getTimeout()
	);
	if ($DB->query($lockSql)->affectedRowsCount())
	{
		$this->mailbox['SYNC_LOCK'] = $startTime;
	}
	else
	{
		return false;
	}

	$minSyncTime = MailMailboxDirectory::getMinSyncTime($this->mailbox['ID']);

	MailMailMessageUidTable::deleteList(
		[
			'=MAILBOX_ID'  => $this->mailbox['ID'],
			'>DELETE_TIME' => 0,
			/*The values in the tables are still used to delete related items (example: attachments):*/
			' $minSyncTime,
		],
		[],
		static::MESSAGE_DELETION_LIMIT_AT_A_TIME
	);

	$unlockSql = sprintf(
		"UPDATE b_mail_mailbox SET SYNC_LOCK = %d WHERE ID = %u AND SYNC_LOCK = %u",
		$syncUnlock, $this->mailbox['ID'], $this->mailbox['SYNC_LOCK']
	);
	if ($DB->query($unlockSql)->affectedRowsCount())
	{
		$this->mailbox['SYNC_LOCK'] = $syncUnlock;
	}

	return true;
}