2.9BSD/usr/include/sys/inline.h

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/*
 * Definitions of inline expansions used for speed,
 * and replacements for them if UNFAST is defined.
 */

#ifndef UNFAST

#define	plock(ip) \
{ \
	while ((ip)->i_flag & ILOCK) { \
		(ip)->i_flag |= IWANT; \
		sleep((caddr_t)(ip), PINOD); \
	} \
	(ip)->i_flag |= ILOCK; \
}

#define	prele(ip) \
{ \
	(ip)->i_flag &= ~ILOCK; \
	if ((ip)->i_flag&IWANT) { \
		(ip)->i_flag &= ~IWANT; \
		wakeup((caddr_t)(ip)); \
	} \
}

/*
 * The GETF macro is used in a conditional, e.g.
 *	if (GETF(fp,fd)) {
 *		u.u_error = EBADF;
 *		return;
 *	}
 */
#define	GETF(fp, fd) \
	((unsigned)(fd) >= NOFILE || ((fp) = u.u_ofile[fd]) == NULL)

#ifdef	UCB_FSFIX
#define	IUPDAT(ip, t1, t2, waitfor) { \
	if (ip->i_flag&(IUPD|IACC|ICHG)) \
		iupdat(ip, t1, t2, waitfor); \
}
#else
#define	IUPDAT(ip, t1, t2) { \
	if (ip->i_flag&(IUPD|IACC|ICHG)) \
		iupdat(ip, t1, t2); \
}
#endif	UCB_FSFIX

#ifndef	MENLO_JCL
#define	ISSIG(p)	((p)->p_sig && issig())
#endif	MENLO_JCL

#else	UNFAST

#ifdef	UCB_FSFIX
#define	IUPDAT(ip, t1, t2, waitfor)	iupdat(ip, t1, t2, waitfor)
#else
#define	IUPDAT(ip, t1, t2)	iupdat(ip, t1, t2)
#endif	UCB_FSFIX

#ifndef	MENLO_JCL
#define	ISSIG(p)	issig(p)
#endif

#endif	UNFAST

/*
 *  Other macros that are always used, or replace null routines.
 */

#ifdef	MENLO_JCL
#define	ISSIG(p)	((p)->p_sig && \
	((p)->p_flag&STRC || ((p)->p_sig & ~(p)->p_ignsig)) && issig())
#endif

#ifndef	INTRLVE
#define	dkblock(bp)	((bp)->b_blkno)
#define	dkunit(bp)	((minor((bp)->b_dev) >> 3) & 07)
#endif	INTRLVE