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

1.1       root        1: /* ptclear.c - _ptclear */
                      2: 
                      3: #include <conf.h>
                      4: #include <kernel.h>
                      5: #include <mark.h>
                      6: #include <ports.h>
                      7: 
                      8: /*------------------------------------------------------------------------
                      9:  *  _ptclear  --  used by pdelete and preset to clear a port
                     10:  *------------------------------------------------------------------------
                     11:  */
                     12: _ptclear(ptptr, newstate, dispose)
                     13:        struct  pt      *ptptr;
                     14:        int     newstate;
                     15:        int     (*dispose)();
                     16: {
                     17:        struct  ptnode  *p;
                     18: 
                     19: 
                     20:        /* put port in limbo until done freeing processes */
                     21: 
                     22:        ptptr->ptstate = PTLIMBO;
                     23:        ptptr->ptseq++;
                     24:        if ( (p=ptptr->pthead) != (struct ptnode *)NULL ) {
                     25:                for(; p != (struct ptnode *)NULL ; p=p->ptnext)
                     26:                        (*dispose)( p->ptmsg );
                     27:                (ptptr->pttail)->ptnext = ptfree;
                     28:                ptfree = ptptr->pthead;
                     29:        }
                     30:        if (newstate == PTALLOC) {
                     31:                ptptr->pttail = ptptr->pthead = (struct ptnode *)NULL;
                     32:                sreset(ptptr->ptssem, ptptr->ptmaxcnt);
                     33:                sreset(ptptr->ptrsem, 0);
                     34:        } else {
                     35:                sdelete(ptptr->ptssem);
                     36:                sdelete(ptptr->ptrsem);
                     37:        }
                     38:        ptptr->ptstate = newstate;
                     39: }

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