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Annotation of xinu/sys/chprio.c, revision 1.1

1.1     ! root        1: /* chprio.c - chprio */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <proc.h>
        !             6: 
        !             7: /*------------------------------------------------------------------------
        !             8:  * chprio  --  change the scheduling priority of a process
        !             9:  *------------------------------------------------------------------------
        !            10:  */
        !            11: SYSCALL chprio(pid,newprio)
        !            12:        int     pid;
        !            13:        int     newprio;                /* newprio > 0                  */
        !            14: {
        !            15:        int     oldprio;
        !            16:        struct  pentry  *pptr;
        !            17:         PStype  ps;
        !            18: 
        !            19:        disable(ps);
        !            20:        if (isbadpid(pid) || newprio<=0 ||
        !            21:            (pptr = &proctab[pid])->pstate == PRFREE) {
        !            22:                restore(ps);
        !            23:                return(SYSERR);
        !            24:        }
        !            25:        oldprio = pptr->pprio;
        !            26:        pptr->pprio = newprio;
        !            27:        switch (pptr->pstate) {
        !            28:        case PRREADY:
        !            29:                insert( dequeue(pid), rdyhead, newprio);
        !            30:        case PRCURR:
        !            31:                resched();
        !            32:        default:
        !            33:                break;
        !            34:        }
        !            35:        restore(ps);
        !            36:        return(oldprio);
        !            37: }

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