1 files changed, 89 insertions, 0 deletions
diff --git a/ndb/include/kernel/NodeBitmask.hpp b/ndb/include/kernel/NodeBitmask.hpp
new file mode 100644
index 00000000000..423c01cd841
--- /dev/null
+++ b/ndb/include/kernel/NodeBitmask.hpp
@@ -0,0 +1,89 @@
+/* Copyright (C) 2003 MySQL AB
+
+   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; either version 2 of the License, or
+   (at your option) any later version.
+
+   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#ifndef NODE_BITMASK_HPP
+#define NODE_BITMASK_HPP
+
+#include <ndb_limits.h>
+#include <kernel_types.h>
+#include <Bitmask.hpp>
+
+/**
+ * No of 32 bits words needed to store a node bitmask
+ *   containing all the nodes in the system
+ *   Both NDB nodes and API, MGM... nodes
+ *
+ * Note that this is used in a lot of signals
+ */
+#define _NODE_BITMASK_SIZE 2
+
+/**
+ * No of 32 bits words needed to store a node bitmask
+ *   containing all the ndb nodes in the system
+ *
+ * Note that this is used in a lot of signals
+ */
+#define _NDB_NODE_BITMASK_SIZE 2
+
+/**
+ * No of 32 bits word needed to store B bits for N nodes
+ */
+#define NODE_ARRAY_SIZE(N, B) (((N)*(B)+31) >> 5)
+
+typedef Bitmask<(unsigned int)_NODE_BITMASK_SIZE> NodeBitmask;
+
+typedef Bitmask<(unsigned int)_NDB_NODE_BITMASK_SIZE> NdbNodeBitmask;
+
+#define __NBM_SZ  ((MAX_NODES >> 5) + ((MAX_NODES & 31) != 0))
+#define __NNBM_SZ ((MAX_NDB_NODES >> 5) + ((MAX_NDB_NODES & 31) != 0))
+
+#if ( __NBM_SZ > _NODE_BITMASK_SIZE)
+#error "MAX_NODES can not fit into NODE_BITMASK_SIZE"
+#endif
+
+#if ( __NNBM_SZ > _NDB_NODE_BITMASK_SIZE)
+#error "MAX_NDB_NODES can not fit into NDB_NODE_BITMASK_SIZE"
+#endif
+
+/**
+ * General B Bits operations
+ *
+ * Get(x, A[], B)
+ *   w = x >> S1
+ *   s = (x & S2) << S3
+ *   return (A[w] >> s) & S4
+ *
+ * Set(x, A[], v, B)
+ *   w    = x >> S1
+ *   s    = (x & S2) << S3
+ *   m    = ~(S4 << s)
+ *   t    = A[w] & m;
+ *   A[w] = t | ((v & S4) << s)
+ *
+ * B(Bits)    S1    S2    S3     S4
+ *    1        5    31     0      1
+ *    2        4    15     1      3
+ *    4        3     7     2     15
+ *    8        2     3     3    255
+ *   16        1     1     4  65535
+ *
+ * S1 = 5 - 2log(B)
+ * S2 = 2^S1 - 1
+ * S3 = 2log(B)
+ * S4 = 2^B - 1
+ */
+
+#endif