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882f16d036
created to use a small set of filenames, to try and avoid problems in the Linux kernel. mysys/Makefile.am: Added my_bitmap.c mysys/my_init.c: my_bitmap code added mysys/mysys_priv.h: my_bitmap sql/mysql_priv.h: temp pool stuff. sql/mysqld.cc: --temp-pool option added sql/sql_select.cc: temp pool stuff sql/table.h: temp pool
61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA */
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/*
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Handling of uchar arrays as large bitmaps.
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*/
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#include "mysys_priv.h"
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#include <my_bitmap.h>
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pthread_mutex_t LOCK_bitmap;
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void bitmap_set_bit(uchar *bitmap, uint bitmap_size, uint bitmap_bit) {
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if((bitmap_bit != MY_BIT_NONE) && (bitmap_bit < bitmap_size*8)) {
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pthread_mutex_lock(&LOCK_bitmap);
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bitmap[bitmap_bit / 8] |= (1 << bitmap_bit % 8);
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pthread_mutex_unlock(&LOCK_bitmap);
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};
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};
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uint bitmap_set_next(uchar *bitmap, uint bitmap_size) {
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uint bit_found = MY_BIT_NONE;
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int i, b;
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pthread_mutex_lock(&LOCK_bitmap);
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for(i=0; (i<bitmap_size) && (bit_found==MY_BIT_NONE); i++) {
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if(bitmap[i] == 0xff) continue;
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for(b=0; (b<8) && (bit_found==MY_BIT_NONE); b++)
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if((bitmap[i] & 1<<b) == 0) {
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bit_found = (i*8)+b;
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bitmap[i] |= 1<<b;
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};
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};
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pthread_mutex_unlock(&LOCK_bitmap);
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return bit_found;
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};
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void bitmap_clear_bit(uchar *bitmap, uint bitmap_size, uint bitmap_bit) {
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if((bitmap_bit != MY_BIT_NONE) && (bitmap_bit < bitmap_size*8)) {
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pthread_mutex_lock(&LOCK_bitmap);
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bitmap[bitmap_bit / 8] &= ~(1 << bitmap_bit % 8);
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pthread_mutex_unlock(&LOCK_bitmap);
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};
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};
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