Can I close a file descriptor in VxWorks without using FIOCANCEL?

Question

I am trying to find a proper way of closing/cancelling the file descriptor ( fd ) in VxWorks. As shown in the example, I have a task that does read operation forever, and I have a second task that will close the fd . In my system, FIOCANCEL is not supported, so I need to find an alternative way. So I am wondering if anyone have some ideas of how I can properly close the fd from the second task?

//Task 1
while (1)
{
  if (running == false)
  break;

  ret = read(fd, buf, size);
 }


// Task 2
running = false;
/* ioctl(fd, FIOCANCEL, 0); (not supported)*/
close(fd);

Answer 1

Probably this is just a small programming error. The close() should work fine. You should just set the running -variable in task 2 to false .