Initial HINT structure added

server/include/hint.h

@@ -0,0 +1,59 @@
+#ifndef _HINT_H
+#define _ATOMIC_H
+/*
+ * This file is distributed as part of MaxScale.  It is free
+ * software: you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation,
+ * version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Copyright SkySQL Ab 2014
+ */
+
+/**
+ * @file hint.h The generic hint data that may be attached to buffers
+ *
+ * @verbatim
+ * Revision History
+ *
+ * Date		Who		Description
+ * 10/07/14	Mark Riddoch	Initial implementation
+ *
+ * @endverbatim
+ */
+
+/**
+ * The types of hint that are supported by the generic hinting mechanism.
+ */
+typedef enum {
+	HINT_ROUTE_TO_MASTER = 1,
+	HINT_ROUTE_TO_SLAVE,
+	HINT_ROUTE_TO_NAMED_SERVER,
+	HINT_ROUTE_TO_UPTODATE_SERVER
+} HINT_TYPE;
+
+/**
+ * A generic hint.
+ *
+ * A hint has a type associated with it and may optionally have hint
+ * specific data.
+ * Multiple hints may be attached to a single buffer.
+ */
+typedef struct hint {
+	HINT_TYPE	type;	/*< The Type of hint */
+	void		*data;	/*< Type sepecific data */
+	unsigned int	dsize;	/*< Size of the hint data */
+	struct hint	*next;	/*< Another hint for this buffer */
+} HINT;
+
+extern	HINT	*hint_alloc(HINT_TYPE, void *, unsigned int);
+extern	void	hint_free(HINT *);
+#endif