proc.h,v

来自「TCP-IP红宝书源代码」· H,V 代码 · 共 127 行

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date	97.09.21.19.26.19;	author dls;	state Dist;
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date	94.05.10.20.48.46;	author dls;	state Old;
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date	94.04.30.18.42.23;	author dls;	state Dist;
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@/* proc.h - isbadpid */

/* process table declarations and defined constants			*/

#ifndef	NPROC				/* set the number of processes	*/
#define	NPROC		30		/*  allowed if not already done	*/
#endif

#ifndef	_NFILE
#define _NFILE		20		/* # of files allowed */
#endif

#define	FDFREE		-1		/* free file descriptor */

/* process state constants */

#define	PRCURR		'\001'		/* process is currently running	*/
#define	PRFREE		'\002'		/* process slot is free		*/
#define	PRREADY		'\003'		/* process is on ready queue	*/
#define	PRRECV		'\004'		/* process waiting for message	*/
#define	PRSLEEP		'\005'		/* process is sleeping		*/
#define	PRSUSP		'\006'		/* process is suspended		*/
#define	PRWAIT		'\007'		/* process is on semaphore queue*/
#define	PRTRECV		'\010'		/* process is timing a receive	*/

/* miscellaneous process definitions */

#define	PNMLEN		16		/* length of process "name"	*/

#define	NULLPROC	0		/* id of the null process; it	*/
					/*  is always eligible to run	*/
#define	BADPID		-1		/* used when invalid pid needed	*/

#define	isbadpid(x)	(x<=0 || x>=NPROC)

/* process table entry */

struct	pentry	{
	char	pstate;			/* process state: PRCURR, etc.	*/
	int	pprio;			/* process priority		*/
	unsigned long	pesp;		/* saved stack pointer		*/
	STATWORD pirmask;		/* saved interrupt mask		*/
	int	psem;			/* semaphore if process waiting	*/
	WORD	pmsg;			/* message sent to this process	*/
	char	phasmsg;		/* nonzero iff pmsg is valid	*/
	int	pbase;			/* base of run time stack	*/
	int	pstklen;		/* stack length			*/
	WORD	plimit;			/* lowest extent of stack	*/
	char	pname[PNMLEN];		/* process name			*/
	int	pargs;			/* initial number of arguments	*/
	WORD	paddr;			/* initial code address		*/
	WORD	pnxtkin;		/* next-of-kin notified of death*/
	Bool	ptcpumode;		/* proc is in TCP urgent mode	*/
	short	pdevs[2];		/* devices to close upon exit	*/
	int	fildes[_NFILE];		/* file - device translation	*/
};


extern	struct	pentry proctab[];
extern	int	numproc;		/* currently active processes	*/
extern	int	nextproc;		/* search point for free slot	*/
extern	int	currpid;		/* currently executing process	*/
extern	int	lastpid;		/* currently executing process	*/
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	int	pesp;			/* saved stack pointer		*/
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#define	PNREGS		19		/* size of saved register area	*/
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	WORD	pregs[PNREGS];		/* saved registers PC, and PS	*/
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	WORD	pbase;			/* base of run time stack	*/
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