61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
#pragma once
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/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl.
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*
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* Change Date: 2019-07-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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/**
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* @file gwbitmask.h An implementation of an arbitrarily long bitmask
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 28/06/13 Mark Riddoch Initial implementation
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* 17/10/15 Martin Brampton Add bitmask_render_readable
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*
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* @endverbatim
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*/
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#include <maxscale/cdefs.h>
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#include <maxscale/spinlock.h>
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#include <maxscale/limits.h>
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MXS_BEGIN_DECLS
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/* This number MUST an be exact multiple of 8 */
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#define MXS_BITMASK_LENGTH (MXS_MAX_THREADS + 1) /**< Number of bits in the bitmask */
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#define MXS_BITMASK_SIZE (MXS_BITMASK_LENGTH / 8) /**< Number of bytes in the bitmask */
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/**
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* The bitmask structure used to store a fixed size bitmask
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*/
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typedef struct
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{
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SPINLOCK lock; /**< Lock to protect the bitmask */
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unsigned char bits[MXS_BITMASK_SIZE]; /**< The bits themselves */
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} GWBITMASK;
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#define GWBITMASK_INIT {SPINLOCK_INIT}
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extern void bitmask_init(GWBITMASK *);
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extern void bitmask_free(GWBITMASK *);
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extern int bitmask_set(GWBITMASK *, int);
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extern int bitmask_clear(GWBITMASK *, int);
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extern int bitmask_clear_without_spinlock(GWBITMASK *, int);
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extern int bitmask_isset(GWBITMASK *, int);
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extern int bitmask_isallclear(GWBITMASK *);
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extern void bitmask_copy(GWBITMASK *, GWBITMASK *);
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extern char *bitmask_render_readable(GWBITMASK *);
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MXS_END_DECLS
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