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Annotation of os2sdk/demos/examples/share/share.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * This is a common include file used by examples share.c and shrchild.c.
                      3:  * It contains the declaration of the shared memory segment.
                      4:  */
                      5: 
                      6: /* Convert an unsigned selector and an unsigned offset into a far pointer */
                      7: 
                      8: #define GETSEGPTR(seg, off)    ((char far *) (((long) seg << 16) + off))
                      9: 
                     10: /* size of shared memory segment */
                     11: #define        SHRSEGSIZE      sizeof(struct ShareRec) 
                     12: 
                     13: #define SHRSEGNAME     "\\SHAREMEM\\SHARESEG.DAT"        /* shared seg name */
                     14: #define        CIRCBUFSIZE     20              /* size of circular buffer */
                     15: #define        TRUE            1
                     16: #define FALSE          0
                     17: #define WAITFOREVER    -1L             /* no timeout if semaphore is owned */
                     18: 
                     19: struct ShareRec {
                     20:        unsigned long   fullsem;        /* buffer access semaphore */
                     21:        unsigned long   emptysem;       /* buffer access semaphore */
                     22:        unsigned long   mutexsem;       /* buffer access semaphore */
                     23:        int             head;           /* buffer write pointer */
                     24:        int             tail;           /* buffer read pointer */
                     25:        char            CircBuffer[CIRCBUFSIZE];        /* circular buffer */
                     26: };
                     27: 
                     28: /* definition of buffer full condition */
                     29: #define BUFFUL(p) ((p->head==p->tail-1)||((p->tail==0)&&(p->head==CIRCBUFSIZE-1)))

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