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Annotation of os2sdk/demos/examples/asyncio/asyncio.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Example of DOSWRITEASYNC. (DOSREADASYNC is not demonstrated,
        !             3:  * but has identical usage).
        !             4:  *
        !             5:  * In this example, the program uses DOSWRITEASYNC to write a
        !             6:  * large block of data to the screen asynchronously, while the
        !             7:  * main program sits in a loop beeping.
        !             8:  *
        !             9:  * Compile as: cl -AL -G2 -Lp async.c
        !            10:  *
        !            11:  * Copyright (C) Microsoft Corp. 1986
        !            12:  */
        !            13: 
        !            14: #include <doscalls.h>
        !            15: 
        !            16: #define FREQ 440
        !            17: #define DURATION 500L
        !            18: 
        !            19: char cbuf[10 * 1024];          /* buffer to write from */
        !            20: long sem;                      /* ram semaphore */
        !            21: 
        !            22: main()
        !            23: {
        !            24:        int i;
        !            25:        unsigned rc;            /* return code */
        !            26:        unsigned bytecount;     /* bytes written */
        !            27: 
        !            28:        for(i = 0; i < sizeof(cbuf); i++)       /* init buffer */
        !            29:                cbuf[i] = 'x';
        !            30: 
        !            31:        sem = 0;
        !            32:        DOSSEMSET((unsigned long)&sem);         /* set semaphore */
        !            33:        DOSWRITEASYNC(1,&sem,&rc,cbuf,sizeof(cbuf),&bytecount);
        !            34: 
        !            35:        for(i = 0; i < 10; i++) {
        !            36:                DOSBEEP(FREQ, DURATION);
        !            37:                DOSSLEEP(DURATION);
        !            38:        }
        !            39: 
        !            40:        DOSSEMWAIT((unsigned long)&sem, -1L);
        !            41:        printf("return code = %d, bytes written = %d\n", rc, bytecount);
        !            42: }

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