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Annotation of os2sdk/demos/examples/vioreg/access.c, revision 1.1

1.1     ! root        1: /* This routine is started in a DosStartSession call from REGISTER.EXE. */
        !             2: /* It accesses the shared memory allocated in REGISTER, and prints the */
        !             3: /* contents of the counters being incremented by the viosubsystem      */
        !             4: /* replacement routine, REPLACE, found in the VIOROUT dll.             */
        !             5: /*                                                                     */
        !             6: /* Created by Microsoft Corp. 1988                                     */
        !             7: 
        !             8: #define INCL_DOSPROCESS
        !             9: #define INCL_DOSMEMMGR
        !            10: #define INCL_DOSSEMAPHORES
        !            11: 
        !            12: #include <os2def.h>
        !            13: #include <bsedos.h>
        !            14: #include <stdio.h>
        !            15: #include "share.h"      /* Common declarations between processes */
        !            16: 
        !            17: main()
        !            18: {   SEL Selector;                  /* Shared memory selector */
        !            19:     struct ShareRec far *SmemPtr;   /* Shared memory layout, defined in Share.h */
        !            20:     unsigned rc;                   /* Return code */
        !            21:     int calls;
        !            22:     int total;
        !            23: 
        !            24:     /* Access shared memory allocated in REGISTER.EXE */
        !            25:     /* This session is started after the memory has been allocated, so
        !            26:        no need to loop waiting for allocation */
        !            27:     if (rc = DosGetShrSeg(SHRSEGNAME, &Selector)){
        !            28:        printf(" Illegal share segment.\n");
        !            29:        DosExit(EXIT_PROCESS,0);
        !            30:        }
        !            31: 
        !            32:     /* Get far pointer from 16 bit selector */
        !            33:     SmemPtr = (struct ShareRec far *)MAKEP(Selector,0);
        !            34: 
        !            35:     printf("\n");
        !            36:     printf("\n");
        !            37:     printf("%60s\n", "ACCESSING SHARED MEMORY REPLACEMENT ROUTINE IS UPDATING");
        !            38:     printf("\n");
        !            39:     printf(" Type CTRL-C to quit\n");
        !            40:     printf("\n");
        !            41:     printf("\n");
        !            42:     while (1 ) {
        !            43:        /* Interleave with replacement routine, REPLACE */
        !            44:        DosSemWait((HSEM)&(SmemPtr->updated), WAITFOREVER);
        !            45: 
        !            46:        DosSemRequest((HSEM)&(SmemPtr->mutexsem), WAITFOREVER);
        !            47:        /* Access counter contents */
        !            48:        calls = SmemPtr->count;
        !            49:        total = SmemPtr->totalength;
        !            50:        DosSemClear((HSEM)&(SmemPtr->mutexsem));
        !            51: 
        !            52:        DosSemSet((HSEM)&(SmemPtr->updated));
        !            53: 
        !            54:        /* Print counter contents */
        !            55:        printf("%s%d%s%d\r", "Number of calls to VIOWRTTTY = ", calls,
        !            56:               " Total number of bytes written = ", total);
        !            57:        }
        !            58: 
        !            59: }

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