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Annotation of xinu/sys/mark.c, revision 1.1.1.1

1.1       root        1: /* mark.c - _mkinit, mark */
                      2: 
                      3: #include <conf.h>
                      4: #include <kernel.h>
                      5: #include <mark.h>
                      6: 
                      7: #ifdef MEMMARK
                      8: int    *marks[MAXMARK];
                      9: int    nmarks;
                     10: int    mkmutex;
                     11: 
                     12: /*------------------------------------------------------------------------
                     13:  *  _mkinit  --  called once at system startup
                     14:  *------------------------------------------------------------------------
                     15:  */
                     16: _mkinit()
                     17: {
                     18:        mkmutex = screate(1);
                     19:        nmarks = 0;
                     20: }
                     21: 
                     22: 
                     23: 
                     24: /*------------------------------------------------------------------------
                     25:  *  mark  --  mark a location if it hasn't been marked
                     26:  *------------------------------------------------------------------------
                     27:  */
                     28: SYSCALL        mark(loc)
                     29: int    *loc;
                     30: {
                     31:        if ( *loc>=0 && *loc<nmarks && marks[*loc]==loc )
                     32:                return(0);
                     33:        if (nmarks>=MAXMARK)
                     34:                return(SYSERR);
                     35:        wait(mkmutex);
                     36:        marks[ (*loc) = nmarks++] = loc;
                     37:        signal(mkmutex);
                     38:        return(OK);
                     39: }
                     40: #endif

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