64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/*
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* Copyright (c) 2020 Huawei Technologies Co.,Ltd.
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*
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* openGauss is licensed under Mulan PSL v2.
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* You can use this software according to the terms and conditions of the Mulan PSL v2.
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* You may obtain a copy of Mulan PSL v2 at:
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*
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* http://license.coscl.org.cn/MulanPSL2
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*
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PSL v2 for more details.
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* ---------------------------------------------------------------------------------------
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*
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* gs_bitmap.h
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* about null bitmap set/query actions
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* 1. bitmap_size
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* 2. bitmap_been_set
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* 3. bitmap_set
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*
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*
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* IDENTIFICATION
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* src/include/utils/gs_bitmap.h
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*
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* ---------------------------------------------------------------------------------------
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*/
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#ifndef CODE_SRC_INCLUDE_NULL_BITMAP_H
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#define CODE_SRC_INCLUDE_NULL_BITMAP_H
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/*
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* bitmap_size
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* Return the bitmap byte-size of x number.
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*/
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#define bitmap_size(x) (((x) + 7) / 8)
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/*
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* @Description: query the value is null or not.
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* @IN bitmap: null bitmap
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* @IN which: which bit
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* @Return: true, if this bit is set to 1;
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* false, if this bit is set to 0;
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* @See also: BitmapSize()
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*/
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static inline bool bitmap_been_set(char* bitmap, int which)
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{
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return (bitmap[which / 8] & (1 << (which % 8)));
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}
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/*
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* @Description: set NULL bit in bitmap.
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* caller must reset the whole bitmap to 0 first.
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* @IN/OUT bitmap: NULL bitmap
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* @IN which: which value is null
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* @See also:
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*/
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static inline void bitmap_set(char* bitmap, int which)
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{
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bitmap[which / 8] |= (1 << (which % 8));
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}
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#endif /* CODE_SRC_INCLUDE_NULL_BITMAP_H */
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