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Annotation of xinu/sys/signaln.c, revision 1.1.1.1

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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