Return to asyncio.c CVS log

Up to [OS/2 SDKs] / os2sdk / demos / examples / asyncio

Annotation of os2sdk/demos/examples/asyncio/asyncio.c, revision 1.1.1.2

1.1       root        1: /*
1.1.1.2 ! root        2:  * Example of DosWriteAsync. (DosReadAsync is not demonstrated,
1.1       root        3:  * but has identical usage).
                      4:  *
1.1.1.2 ! root        5:  * In this example, the program uses DosWriteAsync to write a
1.1       root        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:  *
1.1.1.2 ! root       11:  * Created by Microsoft Corp. 1986
1.1       root       12:  */
                     13: 
1.1.1.2 ! root       14: #define INCL_DOSPROCESS
        !            15: #define INCL_DOSFILEMGR
        !            16: #define INCL_DOSSEMAPHORES
        !            17: 
        !            18: #include <os2def.h>
        !            19: #include <bsedos.h>
1.1       root       20: 
                     21: #define FREQ 440
                     22: #define DURATION 500L
                     23: 
                     24: char cbuf[10 * 1024];          /* buffer to write from */
                     25: long sem;                      /* ram semaphore */
                     26: 
                     27: main()
                     28: {
                     29:        int i;
                     30:        unsigned rc;            /* return code */
                     31:        unsigned bytecount;     /* bytes written */
                     32: 
                     33:        for(i = 0; i < sizeof(cbuf); i++)       /* init buffer */
                     34:                cbuf[i] = 'x';
                     35: 
                     36:        sem = 0;
1.1.1.2 ! root       37:        DosSemSet((HSEM)&sem);         /* set semaphore */
        !            38:        DosWriteAsync(1,&sem,&rc,cbuf,sizeof(cbuf),&bytecount);
1.1       root       39: 
                     40:        for(i = 0; i < 10; i++) {
1.1.1.2 ! root       41:                DosBeep(FREQ, DURATION);
        !            42:                DosSleep(DURATION);
1.1       root       43:        }
                     44: 
1.1.1.2 ! root       45:        DosSemWait((HSEM)&sem, -1L);
1.1       root       46:        printf("return code = %d, bytes written = %d\n", rc, bytecount);
                     47: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.