semcount.c

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#include <xinu.h>

syscall semcount(sid32 semid)
{
    intmask mask; /* Saved interrupt mask       */
    int32 count;  /* Current sempahore count    */

    mask = disable();

    if (isbadsem(semid) || semtab[semid].sstate == S_FREE)
    {
        restore(mask);
        return SYSERR;
    }
    count = semtab[semid].scount;
    restore(mask);
    return count;
}