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Annotation of researchv9/jerq/sgs/inc/sdpsrc/hi/lock.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * static char ID_lckc[] = "@(#) lock.c: 1.1 1/7/82";
                      3:  */
                      4: 
                      5: char *lock(itemid, partnbr, permissions)
                      6: ITEMID itemid;
                      7: int    partnbr, permissions;
                      8: {
                      9: 
                     10:        register int framenbr, spacenbr;
                     11: 
                     12:        spacenbr = XTRCTSP(itemid);
                     13:        if( open_spacenumbers[spacenbr] != YES )
                     14:                return( (char *) fatal("attempt to access unopened address space") );
                     15:        if( XTRCTPN(itemid) > global_frames[spacenbr].maxpage )
                     16:                return( (char *) fatal("attempt to read unallocated page") );
                     17: 
                     18:        LD_lock++;
                     19: #if DEBUG
                     20:        if( dflag > 15 )
                     21:                fprintf( stderr, "  lock %08lx ", itemid );
                     22: #endif
                     23: 
                     24:        if( (framenbr = sojourn((itemid & ~BYTEMASK), partnbr, YES)) < 0 )
                     25:                return( (char *) fatal("unable to obtain frame for item") );
                     26: 
                     27:        if( manager[framenbr].lock_count++ == 0 )
                     28:                if( delist(framenbr) < 0 )
                     29:                        return( (char *) fatal("unable to delist frame for item") );
                     30: 
                     31:        if( permissions == WRTN )
                     32:                manager[framenbr].ref_chng = WRTN;
                     33: 
                     34:        return( (char *) (((int) manager[framenbr].frame_pntr) + XTRCTBY(itemid)) );
                     35: 
                     36: }

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