usr/src/lib/libcompat/4.3/remque.c

/*
 * Copyright (c) 1987 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not 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 MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)remque.c    5.2 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

/*
 * remque -- vax remque instruction
 *
 * NOTE: this implementation is non-atomic!!
 */

struct vaxque {         /* queue format expected by VAX queue instructions */
        struct vaxque   *vq_next;
        struct vaxque   *vq_prev;
};

remque(e)
        register struct vaxque *e;
{
        e->vq_prev->vq_next = e->vq_next;
        e->vq_next->vq_prev = e->vq_prev;
}