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

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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