Function CCH_flush_ast

src/jrd/cch.cpp:1297–1339

}

void CCH_flush_ast(thread_db* tdbb)
{
/**************************************
 *
 *	C C H _ f l u s h _ a s t
 *
 **************************************
 *
 * Functional description
 *	Flush all buffers coming from database file.
 *	Should be called from AST
 *
 **************************************/
	SET_TDBB(tdbb);

	Database* dbb = tdbb->getDatabase();
	BufferControl* bcb = dbb->dbb_bcb;

	if (bcb->bcb_flags & BCB_exclusive)
		CCH_flush(tdbb, FLUSH_ALL, 0);
	else
	{
		SyncLockGuard bcbSync(&bcb->bcb_syncObject, SYNC_SHARED, FB_FUNCTION);

		// Do some fancy footwork to make sure that pages are
		// not removed from the btc tree at AST level.  Then
		// restore the flag to whatever it was before.
		const bool keep_pages = bcb->bcb_flags & BCB_keep_pages;
		bcb->bcb_flags |= BCB_keep_pages;

		for (auto blk : bcb->bcb_bdbBlocks)
		{
			for (BufferDesc* bdb = blk.m_bdbs; bdb < blk.m_bdbs + blk.m_count; bdb++)
			{
				if (bdb->bdb_flags & (BDB_dirty | BDB_db_dirty))
					down_grade(tdbb, bdb, 1);
			}
		}

		if (!keep_pages)
			bcb->bcb_flags &= ~BCB_keep_pages;
	}
}

bool CCH_free_page(thread_db* tdbb)
{