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

1.1       root        1: /* pcreate.c - pcreate */
                      2: 
                      3: #include <conf.h>
                      4: #include <kernel.h>
                      5: #include <mark.h>
                      6: #include <ports.h>
                      7: 
                      8: /*------------------------------------------------------------------------
                      9:  *  pcreate  --  create a port that allows "count" outstanding messages
                     10:  *------------------------------------------------------------------------
                     11:  */
                     12: SYSCALL        pcreate(count)
                     13: int    count;
                     14: {
                     15:        PStype  ps;
                     16:        int     i, p;
                     17:        struct  pt      *ptptr;
                     18: 
                     19:        if (count < 0)
                     20:                return(SYSERR);
                     21:        disable(ps);
                     22: #ifdef MEMMARK
                     23:        if (mark(ptmark) == OK)
                     24:                pinit(MAXMSGS);
                     25: #endif
                     26:        for (i=0 ; i<NPORTS ; i++) {
                     27:                if ( (p=ptnextp--) <= 0)
                     28:                        ptnextp = NPORTS - 1;
                     29:                if ( (ptptr= &ports[p])->ptstate == PTFREE) {
                     30:                        ptptr->ptstate = PTALLOC;
                     31:                        ptptr->ptssem = screate(count);
                     32:                        ptptr->ptrsem = screate(0);
                     33:                        ptptr->pthead = ptptr->pttail
                     34:                                = (struct ptnode *)NULL;
                     35:                        ptptr->ptseq++;
                     36:                        ptptr->ptmaxcnt = count;
                     37:                        restore(ps);
                     38:                        return(p);
                     39:                }
                     40:        }
                     41:        restore(ps);
                     42:        return(SYSERR);
                     43: }

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