pfSense

Here's the PR:
https://github.com/pfsense/pfsense/pull/4697

Current problem:
the widget system does not work as intended - the "interval" is multiplied by the number of active widgets, and so an interval of "1" (meant to be multiplied by 1000 milliseconds) becomes [number of active widgets] seconds instead of 1 second.
Mutex can also block the execution of "refresh" of a widget, resulting in refresh of less widget per "loop".
While testing, mutex was active for about 50% of the time, and so blocked about 50% of the refreshes.
If I remove the mutex and let all the calls run normally, the results are much more predictable.

In the below scenarios, 5 widgets are used: stats, thermal, disk, interfaces (interfaces.php), traffic (ifstats.php).
The refresh intervals are:
stats, disk and interfaces: 1
traffic: 2
thermal: 5

Current behavior in the below picture (notice the irregularity in the calls)

Traffic widget seems to be refreshed as expected, "stats" widget gets called every 5 seconds instead of 1, and thermal widget only gets called once in the time window below.

Behavior after the fix - much more predictable:

1st run:
stats, disk, interfaces

2nd run:
stats, disk, interfaces, traffic

3rd:
stats, disk, interfaces

4th:
stats, disk, interfaces, traffic

5th:
stats, disk, interfaces, thermal

...

10th:
stats, disk, interfaces, traffic, thermal

This means that the "stats" widget gets called every second now, as the default multiplier is 1. I think a multiplier of 5 would be a better starting point, hence the second commit.