Tasks dont resume after preempted

I succesfully compiled microC/OS to be run on an ARM7TDMI processor. I create a task like this one;

void task1(void* pdata)
{
  while (1)
  {
     vs_printf("Hello from task1\n");
    OSTimeDlyHMSM(0, 0, 0, 5);
  }
}
void task2(void*  pdata)
{
  while (1)
  {
    vs_printf("Hello from  task2\n");
    //OSTimeDlyHMSM(0, 0, 0, 5);
    OSTimeDly(3);
   }
}
void task3(void* pdata)
{
  while (1)
  {
     vs_printf("Hello from task3\n");
    OSTimeDlyResume(4);
     OSTimeDlyHMSM(0, 0, 0, 5);
  }
}
int main(void)
{
   CVPTESTPlatform platform;
  platform.FullPlatformInit();
   OSInit();
  OSTaskCreate(task1, (void *)0,  &task1_stk, TASK1_PRIORITY);
  OSTaskCreate(task2, (void *)0, &task2_stk,  TASK2_PRIORITY);
  OSTaskCreate(task3, (void *)0,  &task3_stk, TASK3_PRIORITY);
  OSStart();
   return 0;
}

Hello from task1
Hello from  task2
Hello from task3
Hello from task1