Return to cmap.h CVS log

Up to [Research Unix] / researchv9 / sys.vax / h

Annotation of researchv9/sys.vax/h/cmap.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * core map entry
                      3:  */
                      4: struct cmap
                      5: {
                      6: unsigned int   c_next:13,      /* index of next free list entry */
                      7:                c_prev:13,      /* index of previous (6700 for 8Mb) */
                      8:                c_lock:1,       /* locked for raw i/o or pagein */
                      9:                c_want:1,       /* wanted */
                     10:                c_page:16,      /* virtual page number in segment */
                     11:                c_hlink:13,     /* hash link for <blkno,mdev> */
                     12:                c_intrans:1,    /* intransit bit */
                     13:                c_free:1,       /* on the free list */
                     14:                c_gone:1,       /* associated page has been released */
                     15:                c_type:2,       /* type CSYS or CTEXT or CSTACK or CDATA */
                     16:                c_blkno:20,     /* disk block this is a copy of */
                     17:                c_ndx:10,       /* index of owner proc or text */
                     18:                c_mdev:6;       /* which mounted dev this is from (NMOUNT) */
                     19: };
                     20: 
                     21: #define        CMHEAD  0
                     22: 
                     23: /*
                     24:  * Shared text pages are not totally abandoned when a process
                     25:  * exits, but are remembered while in the free list hashed by <mdev,blkno>
                     26:  * off the cmhash structure so that they can be reattached
                     27:  * if another instance of the program runs again soon.
                     28:  */
                     29: #define        CMHSIZ  512             /* SHOULD BE DYNAMIC */
                     30: #define        CMHASH(bn)      ((bn)&(CMHSIZ-1))
                     31: 
                     32: #ifdef KERNEL
                     33: struct cmap *cmap;
                     34: struct cmap *ecmap;
                     35: int    ncmap;
                     36: struct cmap *mfind();
                     37: int    firstfree, maxfree;
                     38: int    ecmx;                   /* cmap index of ecmap */
                     39: short  cmhash[CMHSIZ];
                     40: #endif
                     41: 
                     42: /* bits defined in c_type */
                     43: 
                     44: #define        CSYS            0               /* none of below */
                     45: #define        CTEXT           1               /* belongs to shared text segment */
                     46: #define        CDATA           2               /* belongs to data segment */
                     47: #define        CSTACK          3               /* belongs to stack segment */
                     48: 
                     49: #define        pgtocm(x)       ((((x)-firstfree) / CLSIZE) + 1)
                     50: #define        cmtopg(x)       ((((x)-1) * CLSIZE) + firstfree)

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.