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13a57d19d1
Fixed crash in SELECT DISTINCT SUM(...) Fix return value of mysortncmp() for innobase Fix join_crash bug Docs/manual.texi: Changelog include/my_pthread.h: Added defines for fast mutex in glibc 2.2 mysql-test/t/join_crash.test: Changed table names to t1,t2... mysys/my_bitmap.c: Use fast mutex mysys/my_open.c: Use fast mutex mysys/my_pthread.c: Use fast mutex mysys/my_thr_init.c: Use fast mutex mysys/my_winthread.c: Use fast mutex mysys/thr_mutex.c: Use new mutexattr with error checking sql/ha_innobase.cc: Fix return value of mysortncmp() for innobase sql/sql_select.cc: Fix join_crash bug BitKeeper/etc/logging_ok: Logging to logging@openlogging.org accepted
105 lines
2.6 KiB
C
105 lines
2.6 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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We assume that the size of the used bitmap is less than ~(uint) 0
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TODO:
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Make assembler THREAD safe versions of these using test-and-set instructions
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*/
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#include "mysys_priv.h"
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#include <my_bitmap.h>
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#include <assert.h>
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my_bool bitmap_init(MY_BITMAP *map, uint bitmap_size)
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{
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if (!(map->bitmap=(uchar*) my_malloc((bitmap_size+7)/8,
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MYF(MY_WME | MY_ZEROFILL))))
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return 1;
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dbug_assert(bitmap_size != ~(uint) 0);
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#ifdef THREAD
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pthread_mutex_init(&map->mutex, MY_MUTEX_INIT_FAST);
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#endif
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map->bitmap_size=bitmap_size;
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return 0;
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}
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void bitmap_free(MY_BITMAP *map)
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{
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if (map->bitmap)
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{
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my_free((char*) map->bitmap, MYF(0));
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map->bitmap=0;
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#ifdef THREAD
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pthread_mutex_destroy(&map->mutex);
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#endif
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}
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}
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void bitmap_set_bit(MY_BITMAP *map, uint bitmap_bit)
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{
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if (bitmap_bit < map->bitmap_size)
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{
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pthread_mutex_lock(&map->mutex);
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map->bitmap[bitmap_bit / 8] |= (1 << (bitmap_bit & 7));
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pthread_mutex_unlock(&map->mutex);
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}
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}
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uint bitmap_set_next(MY_BITMAP *map)
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{
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uchar *bitmap=map->bitmap;
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uint bit_found = MY_BIT_NONE;
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uint bitmap_size=map->bitmap_size;
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uint i;
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pthread_mutex_lock(&map->mutex);
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for (i=0; i < bitmap_size ; i++, bitmap++)
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{
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if (*bitmap != 0xff)
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{ /* Found slot with free bit */
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uint b;
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for (b=0; ; b++)
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{
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if (!(*bitmap & (1 << b)))
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{
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*bitmap |= 1<<b;
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bit_found = (i*8)+b;
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break;
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}
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}
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break; /* Found bit */
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}
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}
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pthread_mutex_unlock(&map->mutex);
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return bit_found;
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}
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void bitmap_clear_bit(MY_BITMAP *map, uint bitmap_bit)
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{
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if (bitmap_bit < map->bitmap_size)
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{
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pthread_mutex_lock(&map->mutex);
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map->bitmap[bitmap_bit / 8] &= ~ (1 << (bitmap_bit & 7));
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pthread_mutex_unlock(&map->mutex);
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}
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}
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