ptclear.c

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#include <xinu.h>

void _ptclear(struct ptentry *ptptr, uint16 newstate, int32 (*dispose)(int32))
{
    struct ptnode *walk; /* Pointer to walk message list    */

    /* Place port in limbo state while waiting processes are freed */

    ptptr->ptstate = PT_LIMBO;

    ptptr->ptseq++;       /* Reset accession number */
    walk = ptptr->pthead; /* First item on msg list */

    if (walk != NULL)
    { /* If message list nonempty   */

        /* Walk message list and dispose of each message */

        for (; walk != NULL; walk = walk->ptnext)
        {
            (*dispose)(walk->ptmsg);
        }

        /* Link entire message list into the free list */

        (ptptr->pttail)->ptnext = ptfree;
        ptfree = ptptr->pthead;
    }

    if (newstate == PT_ALLOC)
    {
        ptptr->pttail = ptptr->pthead = NULL;
        semreset(ptptr->ptssem, ptptr->ptmaxcnt);
        semreset(ptptr->ptrsem, 0);
    }
    else
    {
        semdelete(ptptr->ptssem);
        semdelete(ptptr->ptrsem);
    }
    ptptr->ptstate = newstate;
    return;
}