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Annotation of os2sdk/demos/examples/share/share.h, revision 1.1.1.2

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: 
                      9: /* size of shared memory segment */
                     10: #define        SHRSEGSIZE      sizeof(struct ShareRec) 
                     11: 
                     12: #define SHRSEGNAME     "\\SHAREMEM\\SHARESEG.DAT"        /* shared seg name */
                     13: #define        CIRCBUFSIZE     20              /* size of circular buffer */
                     14: #define WAITFOREVER    -1L             /* no timeout if semaphore is owned */
                     15: 
                     16: struct ShareRec {
1.1.1.2 ! root       17:        ULONG           fullsem;        /* buffer access semaphore */
        !            18:        ULONG           emptysem;       /* buffer access semaphore */
        !            19:        ULONG           mutexsem;       /* buffer access semaphore */
1.1       root       20:        int             head;           /* buffer write pointer */
                     21:        int             tail;           /* buffer read pointer */
                     22:        char            CircBuffer[CIRCBUFSIZE];        /* circular buffer */
                     23: };
                     24: 
                     25: /* definition of buffer full condition */
                     26: #define BUFFUL(p) ((p->head==p->tail-1)||((p->tail==0)&&(p->head==CIRCBUFSIZE-1)))

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