text.h

著名的AT&T UNIX v6 源码

/*
 * Text structure.
 * One allocated per pure
 * procedure on swap device.
 * Manipulated by text.c
 */
struct text
{
	short	x_daddr;	/* disk address of segment (relative to swplo) */
	short	x_size;		/* size (clicks) */
	struct proc *x_caddr;	/* ptr to linked proc, if loaded */
	struct inode *x_iptr;	/* inode of prototype */
	char	x_count;	/* reference count */
	char	x_ccount;	/* number of loaded references */
	char	x_flag;		/* traced, written flags */
};

extern struct text text[];

#define	XTRC	01		/* Text may be written, exclusive use */
#define	XWRIT	02		/* Text written into, must swap out */
#define	XLOAD	04		/* Currently being read from file */
#define	XLOCK	010		/* Being swapped in or out */
#define	XWANT	020		/* Wanted for swapping */