Where is the function 'appMain'?

In the file /dvsdk_2_00_00_22/dmai_1_20_00_06/packages/ti/sdo/dmai/apps/image_decode_io/bios/main.c

Void main()
{
TSK_Attrs attrs = TSK_ATTRS;

/* Validate the arguments given to the app */
parseArgs(&passedArgs);

/* init trace */
GT_init();

/* Set printf function for GT */
GT_setprintf( (GT_PrintFxn)printf );

attrs.stacksize = 0x4000;
if (TSK_create((Fxn)appMain, &attrs, (Arg)&passedArgs) == NULL) {
exit(EXIT_FAILURE);
}

return;
}

I want to know where is function 'appMain'?

This is a DSP side program.I search the dictionary but can't find this function.

Thanks for helping me.