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

1.1     ! root        1: /* sreset.c - sreset */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <proc.h>
        !             6: #include <q.h>
        !             7: #include <sem.h>
        !             8: 
        !             9: /*------------------------------------------------------------------------
        !            10:  *  sreset  --  reset the count and queue of a semaphore
        !            11:  *------------------------------------------------------------------------
        !            12:  */
        !            13: SYSCALL sreset(sem,count)
        !            14:        int     sem;
        !            15:        int     count;
        !            16: {
        !            17:        struct  sentry  *sptr;
        !            18:        PStype  ps;
        !            19:        int     pid;
        !            20:        int     slist;
        !            21: 
        !            22:        disable(ps);
        !            23:        if (isbadsem(sem) || count<0 || semaph[sem].sstate==SFREE) {
        !            24:                restore(ps);
        !            25:                return(SYSERR);
        !            26:        }
        !            27:        sptr = &semaph[sem];
        !            28:        slist = sptr->sqhead;
        !            29:        while ((pid=getfirst(slist)) != EMPTY)
        !            30:                ready(pid,RESCHNO);
        !            31:        sptr->semcnt = count;
        !            32:        resched();
        !            33:        restore(ps);
        !            34:        return(OK);
        !            35: }

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