delay.h

GNU Mach 微内核源代码, 基于美国卡内基美隆大学的 Mach 研究项目

#ifndef _I386_DELAY_H
#define _I386_DELAY_H

/*
 * Copyright (C) 1993 Linus Torvalds
 *
 * Delay routines calling functions in arch/i386/lib/delay.c
 */
 
extern void __udelay(unsigned long usecs);
extern void __const_udelay(unsigned long usecs);
extern void __delay(unsigned long loops);

#define udelay(n) (__builtin_constant_p(n) ? \
	__const_udelay((n) * 0x10c6ul) : \
	__udelay(n))

#endif /* defined(_I386_DELAY_H) */