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RTX TINY LCD PROBLEM

HI, I HAVE CREATED TWO TASK IN TASK1 I AM DOING RELAY ON OFF AND IN TASK2 I AM DISPLAING "HELLOW WORLD"ON LCD BUT ONLY TASK1 IS FUNCTIONING,LCD SOME TIME SHOWS GARBADGE AND SOMTIME ONLY CURSOR. my program
void job1(void)_task_ 0
{

lcd_init();

while(1)

{

os_create_task (1); os_create_task (2);

}
}

void lcd (void) _task_ 1
{

strcpy(lcd_buffer,"HELLOW WORLD "); lcd_display(lcd_buffer);
} void relay (void) _task_ 2
{ RELAY=~RELAY;
DELAY(20);//ms
}

i am using 4 line lcd .this is the problem of delay which i am using in lcd routine or something else.
plz help me.