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Annotation of xinu/h/ports.h, revision 1.1.1.2

1.1       root        1: /* ports.h - isbadport */
                      2: 
1.1.1.2 ! root        3: #define        NPORTS          30              /* maximum number of ports      */
1.1       root        4: #define        MAXMSGS         100             /* maximum messages on all ports*/
                      5: #define        PTFREE          '\01'           /* port is Free                 */
                      6: #define        PTLIMBO         '\02'           /* port is being deleted/reset  */
                      7: #define        PTALLOC         '\03'           /* port is allocated            */
                      8: #define        PTEMPTY         -1              /* initial semaphore entries    */
                      9: 
                     10: struct ptnode  {                       /* node on list of message ptrs */
1.1.1.2 ! root       11:        WORD    ptmsg;                  /* a one-word message           */
1.1       root       12:        struct  ptnode  *ptnext;        /* address of next node on list */
                     13: };
                     14: 
                     15: struct pt      {                       /* entry in the port table      */
                     16:        char    ptstate;                /* port state (FREE/LIMBO/ALLOC)*/
                     17:        int     ptssem;                 /* sender semaphore             */
                     18:        int     ptrsem;                 /* receiver semaphore           */
                     19:        int     ptmaxcnt;               /* max messages to be queued    */
                     20:        int     ptseq;                  /* sequence changed at creation */
                     21:        struct  ptnode  *pthead;        /* list of message pointers     */
                     22:        struct  ptnode  *pttail;        /* tail of message list         */
                     23: };
                     24: 
                     25: extern struct  ptnode  *ptfree;        /* list of free nodes           */
                     26: extern struct  pt      ports[];        /* port table                   */
                     27: extern int     ptnextp;                /* next port to examine when    */
                     28:                                        /*   looking for a free one     */
                     29: #ifdef MEMMARK
                     30: extern MARKER  ptmark;
                     31: #endif
                     32: 
1.1.1.2 ! root       33: #define        isbadport(pid)  ( (pid)<0 || (pid)>=NPORTS )

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