timer.h

来自「用于嵌入式系统的TCP/IP协议栈及若干服务」· C头文件 代码 · 共 90 行

/*
*            Copyright (c) 1998-2001 by NETsilicon Inc.
*
*  This software is copyrighted by and is the sole property of
*  NETsilicon.  All rights, title, ownership, or other interests
*  in the software remain the property of NETsilicon.  This
*  software may only be used in accordance with the corresponding
*  license agreement.  Any unauthorized use, duplication, transmission,
*  distribution, or disclosure of this software is expressly forbidden.
*
*  This Copyright notice may not be removed or modified without prior
*  written consent of NETsilicon.
*
*  NETsilicon, reserves the right to modify this software
*  without notice.
*
*  NETsilicon
*  411 Waverley Oaks Road                  USA 781.647.1234
*  Suite 227                               http://www.netsilicon.com
*  Waltham, MA 02452                       [e-mail]
*
*************************************************************************
*  $Name: Fusion 6.52 Fusion 6.51 $
*  $Date: 2001/09/20 10:19:25 $
*  $Source: M:/psisrc/stack/incl/rcs/timer.h $
*  $Revision: 1.12 $
**************************************************************************
*  File Description:  Definitions and macros for dealing with the kernel
*                     `tcb' structure
**************************************************************************/

#ifndef _TIMER_
#define _TIMER_

#include "config.h"
#include "ccdep.h"
#include "q.h"
#include "std.h"

/* timer control block (TCB) structure */
typedef struct tcb {
	q       tc_q;           /* linkage to siblings */
	u16     tc_flags;       /* see below */
	int     (*tc_pfi)(void * tc_arg);   /* function to call-out */
	void    * tc_arg;         /* argument passed to 'tc_pfi' */
	u32     tc_period;      /* regular firing interval */
	i32     tc_interval;    /* next firing interval */
	u32     tc_elapsed;     /* time passed against 'tc_interval' */
} tcb;

/* flags for tc.tc_flags */
#define F_T_ONESHOT     (u16)0x0001          /* pfi to be called once only */
#define F_T_ALLOCATED   (u16)0x0002          /* this tcb was heap allocated */
#define F_T_CRITICAL    (u16)0x0004          /* call-out in critical section */
#define F_T_STOPPED     (u16)0x0008          /* don't call the timeout routine */
#define F_T_FIRING      (u16)0x0010          /* being done right now */
#define F_T_ZAPPED      (u16)0x0020          /* needs deletion when done firing */


/* Timer Constants default values */


/* Used in ncdid.c */
/* ARP Timer constants */

#define ARP_ENTRY_TTL           (u32)15     /* ARP Cache Entry TTL (in minutes)*/
#define ARP_ASK_INTERVAL        (u32)250    /* ARP ASK timeout interval */

/*  Router Timer constants */

#define ROUTER_ASK_INTERVAL     (u32)1000 /* router ASK timeout interval */
/* interval at which reference counts will be halved */
#define AGING_INTERVAL  ((u32)30000)

/* declarations (imports from "sock/timer.c") */

/* macros */
#define t_elapsed(tcbp) ((tcbp)->tc_elapsed)
#define t_firing(tcbp)  ((boolean)((tcbp)->tc_flags & F_T_FIRING))
#define t_flags(tcbp)   ((tcbp)->tc_flags)
#define t_period(tcbp)  ((tcbp)->tc_period)
#define t_remaining(tcbp)       (t_period(tcbp) - t_elapsed(tcbp))
#define t_stopped(tcbp) ((boolean)((tcbp)->tc_flags & F_T_STOPPED))

/* visible data structures */
import  u32     t_clicks;       /* # of MS_PER_TICK-clicks since initialization */
import  u32     t_time;         /* # of milliseconds since midnight GMT */

#endif  /*_TIMER_*/