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89 lines
2.4 KiB
C++
89 lines
2.4 KiB
C++
/* Copyright (C) 2003 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifndef NODE_BITMASK_HPP
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#define NODE_BITMASK_HPP
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#include <ndb_limits.h>
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#include <kernel_types.h>
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#include <Bitmask.hpp>
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/**
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* No of 32 bits words needed to store a node bitmask
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* containing all the nodes in the system
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* Both NDB nodes and API, MGM... nodes
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*
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* Note that this is used in a lot of signals
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*/
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#define _NODE_BITMASK_SIZE 2
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/**
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* No of 32 bits words needed to store a node bitmask
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* containing all the ndb nodes in the system
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*
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* Note that this is used in a lot of signals
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*/
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#define _NDB_NODE_BITMASK_SIZE 2
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/**
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* No of 32 bits word needed to store B bits for N nodes
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*/
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#define NODE_ARRAY_SIZE(N, B) (((N)*(B)+31) >> 5)
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typedef Bitmask<(unsigned int)_NODE_BITMASK_SIZE> NodeBitmask;
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typedef Bitmask<(unsigned int)_NDB_NODE_BITMASK_SIZE> NdbNodeBitmask;
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#define __NBM_SZ ((MAX_NODES >> 5) + ((MAX_NODES & 31) != 0))
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#define __NNBM_SZ ((MAX_NDB_NODES >> 5) + ((MAX_NDB_NODES & 31) != 0))
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#if ( __NBM_SZ > _NODE_BITMASK_SIZE)
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#error "MAX_NODES can not fit into NODE_BITMASK_SIZE"
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#endif
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#if ( __NNBM_SZ > _NDB_NODE_BITMASK_SIZE)
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#error "MAX_NDB_NODES can not fit into NDB_NODE_BITMASK_SIZE"
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#endif
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/**
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* General B Bits operations
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*
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* Get(x, A[], B)
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* w = x >> S1
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* s = (x & S2) << S3
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* return (A[w] >> s) & S4
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*
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* Set(x, A[], v, B)
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* w = x >> S1
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* s = (x & S2) << S3
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* m = ~(S4 << s)
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* t = A[w] & m;
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* A[w] = t | ((v & S4) << s)
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*
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* B(Bits) S1 S2 S3 S4
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* 1 5 31 0 1
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* 2 4 15 1 3
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* 4 3 7 2 15
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* 8 2 3 3 255
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* 16 1 1 4 65535
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*
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* S1 = 5 - 2log(B)
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* S2 = 2^S1 - 1
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* S3 = 2log(B)
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* S4 = 2^B - 1
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*/
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#endif
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