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Length: 1095 (0x447)
Types: TextFile
Notes: UNIX file
Names: »vmswap.h«
└─⟦26887b7e0⟧ Bits:30009717 Comet 32 harddisk image
└─⟦28c352965⟧ »/a« UNIX Filesystem
└─⟦this⟧ »usr/include/sys/vmswap.h«
/*
* @(#)vmswap.h 1.2 9/2/83
* @(#)Copyright (C) 1983 by National Semiconductor Corp.
*/
#define SWAPSIZE 32 /* maximum pages swapped in one operation */
/* Header for swapping operations (or demand-paged text reads). Each swap
* structure holds a list of all physical pages that want to be read from
* a particular device, or written to a particular device.
*
* WARNING: The first entry in the swap structure MUST be the swap
* buffer sw_buf (assummed by swapint).
*/
struct swap {
struct buf sw_buf; /* buffer for I/O (MUST BE FIRST) */
struct cst *sw_queue; /* list of pages waiting to transfer */
struct cst *sw_active; /* pages actively being transferred */
long sw_inval; /* counter for swapinsert retries */
short sw_count; /* count of pages queued */
short sw_dir; /* direction of I/O */
long sw_pages[SWAPSIZE]; /* page addresses for current I/O */
};
#ifdef KERNEL
extern int nswapbuf; /* number of swapping buffers */
extern struct swap *swapbuf; /* address of swapping buffers */
extern struct swap *swapbufNSWAPBUF; /* end of swapping buffers */
#endif