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Annotation of researchv10no/ipc/mgrs/ndkmgr/dkwindow.h, revision 1.1

1.1     ! root        1: /*  URP window-size negotiation.
        !             2:  *
        !             3:  *  The 16 bits of the window-size argument are defined as:
        !             4:  *
        !             5:  *  -----------------------------------------------------------------
        !             6:  *  |valid|   spare   |   originator   |   destination  |   traffic |
        !             7:  *  |     |           |   window size  |   window size  |           |
        !             8:  *  -----------------------------------------------------------------
        !             9:  *     1        3              4                4              4
        !            10:  *
        !            11:  *  The "valid" bit equals 1 to indicate that the window size values
        !            12:  *  are specified.  Zero means they should be ignored and that default
        !            13:  *  values must be used instead.  Old controllers that do not have
        !            14:  *  window size negotiation happen to set this bit to zero, fortunately.
        !            15:  *
        !            16:  *  The actual window size is computed from the 4-bit window size 
        !            17:  *  parameter (n) as 2**(n+4).  Thus, window sizes range from 16 to
        !            18:  *  512K bytes.
        !            19:  *
        !            20:  *  The originator of a call sets his "originator window size" to be
        !            21:  *  less than or equal to the size of his receive buffer, and he
        !            22:  *  requests through the "destination window size" the size of the
        !            23:  *  buffer that he would like to use for transmission.  As the call
        !            24:  *  is being set up, trunk processes and the destination line process
        !            25:  *  may lower either or both window sizes.  The resulting window sizes
        !            26:  *  are returned to the originator in the call ANSWER message.
        !            27:  */
        !            28: 
        !            29: #ifndef MIN
        !            30: #define MIN(x,y)  (x < y ? x : y)
        !            31: #endif
        !            32: /* Format originator, destination, and traffic values */
        !            33: #define WINDOW(o,d,t)  ((o<<8) | (d<<4) | t | 0100000)
        !            34: 
        !            35: #define W_VALID(x)  (x & 0100000)
        !            36: 
        !            37: #define W_ORIG(x)  ((x>>8) & 017)
        !            38: 
        !            39: #define W_DEST(x)  ((x>>4) & 017)
        !            40: 
        !            41: #define W_TRAF(x)  (x & 017)
        !            42: 
        !            43: #define W_DESTMAX(x,y)  (WINDOW(W_ORIG(x),MIN(W_DEST(x),y),W_TRAF(x)))
        !            44: 
        !            45: #define W_LIMIT(x,y)  (WINDOW(MIN(W_ORIG(x),y),MIN(W_DEST(x),y),W_TRAF(x)))
        !            46: 
        !            47: #define        W_VALUE(x)      (1<<(x+4))
        !            48: 
        !            49: 
        !            50: #define WS_16  0
        !            51: #define WS_32  1
        !            52: #define WS_64  2
        !            53: #define WS_128 3
        !            54: #define WS_256 4
        !            55: #define WS_512 5
        !            56: #define WS_1K  6
        !            57: #define WS_2K  7
        !            58: #define WS_4K  8
        !            59: #define WS_8K  9
        !            60: #define WS_16K 10
        !            61: #define WS_32K 11
        !            62: #define WS_64K 12
        !            63: #define WS_128K        13
        !            64: #define WS_256K        14
        !            65: #define WS_512K        15

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