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INSQUE.C
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C/C++ Source or Header
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1992-03-02
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2KB
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49 lines
/* This is file INSQUE.C */
/* This file may have been modified by DJ Delorie (Jan 1991). If so,
** these modifications are Coyright (C) 1991 DJ Delorie, 24 Kirsten Ave,
** Rochester NH, 03867-2954, USA.
*/
/*
* Copyright (c) 1987 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that: (1) source distributions retain this entire copyright
* notice and comment, and (2) distributions including binaries display
* the following acknowledgement: ``This product includes software
* developed by the University of California, Berkeley and its contributors''
* in the documentation or other materials provided with the distribution
* and in all advertising materials mentioning features or use of this
* software. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)insque.c 5.3 (Berkeley) 6/1/90";
#endif /* LIBC_SCCS and not lint */
/*
* insque -- vax insque instruction
*
* NOTE: this implementation is non-atomic!!
*/
struct vaxque { /* queue format expected by VAX queue instructions */
struct vaxque *vq_next;
struct vaxque *vq_prev;
};
insque(e, prev)
register struct vaxque *e, *prev;
{
e->vq_prev = prev;
e->vq_next = prev->vq_next;
prev->vq_next->vq_prev = e;
prev->vq_next = e;
}