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

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

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