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

1.1     ! root        1: /* signal.c - signal */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <proc.h>
        !             6: #include <q.h>
        !             7: #include <sem.h>
        !             8: 
        !             9: /*------------------------------------------------------------------------
        !            10:  * signal  --  signal a semaphore, releasing one waiting process
        !            11:  *------------------------------------------------------------------------
        !            12:  */
        !            13: SYSCALL signal(sem)
        !            14: register int   sem;
        !            15: {
        !            16:        register struct sentry  *sptr;
        !            17:        PStype  ps;
        !            18: 
        !            19:        disable(ps);
        !            20:        if (isbadsem(sem) || (sptr= &semaph[sem])->sstate==SFREE) {
        !            21:                restore(ps);
        !            22:                return(SYSERR);
        !            23:        }
        !            24:        if ((sptr->semcnt++) < 0)
        !            25:                ready(getfirst(sptr->sqhead), RESCHYES);
        !            26:        restore(ps);
        !            27:        return(OK);
        !            28: }

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