the begginning

utils/multicast/util.h

@@ -0,0 +1,34 @@
+/* Copyright (C) 2014 InfiniDB, Inc.
+
+   This program 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 of
+   the License.
+
+   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. */
+
+#ifndef UTIL_H
+#define UTIL_H
+
+#include <stdlib.h>
+
+#define MALLOC(type) ((type*)calloc(1, sizeof(type)))
+
+/* bitmap manipulation */
+#define BITS_PER_ITEM(map) (sizeof(map[0])*8)
+#define MASK(pos,map) (1 << ((pos) % (BITS_PER_ITEM(map))))
+#define POS(pos,map)  ((pos) / BITS_PER_ITEM(map))
+#define SET_BIT(x, map) (map[POS(x,map)] |= MASK(x,map))
+#define CLR_BIT(x, map) (map[POS(x,map)] &= ~MASK(x,map))
+#define BIT_ISSET(x, map) (map[POS(x,map)] & MASK(x,map))
+
+
+#endif