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Annotation of xinu/sys/chprio.c, revision 1.1.1.2

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: 
1.1.1.2 ! root       18:        disable();
1.1       root       19:        if (isbadpid(pid) || newprio<=0 ||
                     20:            (pptr = &proctab[pid])->pstate == PRFREE) {
1.1.1.2 ! root       21:                restore();
1.1       root       22:                return(SYSERR);
                     23:        }
                     24:        oldprio = pptr->pprio;
                     25:        pptr->pprio = newprio;
1.1.1.2 ! root       26:        if (pptr->pstate == PRREADY) {
        !            27:                dequeue(pid);
        !            28:                insert(pid, rdyhead, newprio);
        !            29:        } 
        !            30:        restore();
1.1       root       31:        return(oldprio);
                     32: }

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