os_eventq_get() + timeout

[Sterling Hughes]

Hey,

I'm looking at: https://issues.apache.org/jira/browse/MYNEWT-8
I'm wondering if I should break BC on this one, and add a new parameter, 
or add a new function call:

- os_eventq_select()

OS_EVENTQ_MASK(my_mask, EVENT_T_TIMER);
OS_EVENTQ_MASK(my_mask, EVENT_T_DATA);

/* timeout after 200 ticks */
ev = os_eventq_select(&my_evq, &my_mask, 200);

Thoughts?

Sterling

PS: For the uninitiated, os_eventq_get() works as follows.

In your task, you create an eventq with os_eventq_init(), and then you 
wait (forever) on os_eventq_get().

If you (currently) want to not wait forever, you can use a callout, 
which will post an event to the eventq after a certain time expires.

  while (1) {
    ev = os_eventq_get(&my_evq);
    switch (ev->ev_type) {
        case EVENT_T_DATA: /* read data from socket */
          recv_data();
        case EVENT_T_TIMER: /* timer expired */
          os_callout_reset(&my_callout, &my_evq, 20);
    }
  }