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