What no native OS2 program?  :-) Are you sure that you have background
execution on?  Compile this little skeleton program which should give you a
visual view of what is happening.  When executed the right way, SLEEPER ON,
it should only use 1 or 2 percent of your CPU.  Fire up half a dozen
copies, (START /WIN SLEEPER ON); highlight them in the tasklist and tile
the windows.  Do other things with your system and you should find them all
still running.  Replace one of the dummy functions with your clock check
and file I/O.  When it is all working then port it back to your original
program.

/* Sleeper.c   a gee wiz test by Lynn Nash */ #include 
#include  #include  #include 
#define BOOL(x) (!(!(x))) void (*kbloop1)(void) = NULL;    /* generic
function pointer */ void (*kbloop2)(short *) = NULL; /* generic function
pointer */ short count = 0;                 /* counter variable         */

void sleeper(void) {
    union REGS regs;             /* temporary DOS interrupt register */

    regs.x.ax = 0x1680;          /* time slice release flag          */
    int86(0x2f, ®s, ®s);   /* give up remainder of timeslice   */ }

short looper(short itoggle) {    /* a typical DOS stealth polling loop */
    short i;

    for (;;) {
       if (kbhit()) {
           i =  getch();
           if (i)
              return i;                       /* a regular key */
           else
             return (short) (getch() + 256); /* a function key  */
       }

       if (kbloop1 != NULL)        /* pointer to spin function 1 */
          (*kbloop1)();

       if (!itoggle)
           sleeper();              /* return to OS2              */

       if (kbloop2 != NULL)        /* pointer to spin function 2 */
          (*kbloop2)(&count);

       if (!itoggle)
           sleeper();              /* return to OS2              */
    }
}

void DoNothing1(void) {
    fprintf(stdout, "Count is now %d +0+\r", count++); }

void DoNothing2(short *acount) {
    fprintf(stdout,"Count is now %d *o*\r", (*acount)--); }

#define HLP_MSG \
"\nThis routine tests the OS/2 time slice release function.\n" \
"Usage: SLEEPER OFF\n" \ "Will run the routine saturating
the time slice\n" \ "Usage: SLEEPER ON\n" \ "Will run
the routine releasing each time slice\n" \ "Enjoy --Lynn \n"

int main(int argc, char *argv[]) {
    if (argc < 2) {
       fprintf(stdout, "%s", HLP_MSG);
       return -1;
    }
    if ((stricmp("ON", argv[1]) != 0) &&
             (stricmp("OFF", argv[1]) != 0)) {
       fprintf(stdout, "%s", HLP_MSG);
       return -1;
    }
    kbloop1 = DoNothing1;        /* Attach a function to spinner    */
    kbloop2 = DoNothing2;        /* Attach a function to spinner    */
    fprintf(stdout, "\n");
    /* Go spin around until a keypress */
    return looper(BOOL(stricmp("ON", argv[1]))); }
/*-------------------------End of Line-------------------------------*/

--Lynn

 * SLMR 2.1a * W.A.R.P.: We Appreciate Real Programming

--- DB 1.39/004485