db/lock/lock_conflict.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996, 1997, 1998
 *  Sleepycat Software.  All rights reserved.
 */

#include "config.h"

#ifndef lint
static const char sccsid[] = "@(#)lock_conflict.c   10.4 (Sleepycat) 11/20/98";
#endif /* not lint */

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#endif

#include "db_int.h"

/*
 * The conflict arrays are set up such that the row is the lock you
 * are holding and the column is the lock that is desired.
 */
const u_int8_t db_rw_conflicts[] = {
    /*      N   R   W */
    /*   N */   0,  0,  0,
    /*   R */   0,  0,  1,
    /*   W */   0,  1,  1
};

const u_int8_t db_riw_conflicts[] = {
    /*      N       S       X   IX      IS  SIX */
    /*   N */   0,  0,  0,  0,  0,  0,
    /*   S */   0,  0,  1,  1,  0,  1,
    /*   X */   1,  1,  1,  1,  1,  1,
    /*  IX */   0,  1,  1,  0,  0,  0,
    /*  IS */   0,  0,  1,  0,  0,  0,
    /* SIX */   0,  1,  1,  0,  0,  0
};