Sets a function to be called at regular intervals, with the given priority.
The function is called repeatedly until it returns false, at which point the timeout is automatically
destroyed and the function will not be called again. The
notify function is called when the timeout is destroyed. The first call to
the function will be at the end of the first
Note that timeout functions may be delayed, due to the processing of other event sources. Thus they should not be relied on for precise timing. After each call to the timeout function, the time of the next timeout is recalculated based on the current time and the given interval (it does not try to 'catch up' time lost in delays).
See memory management of sources for details on how to handle the return value and memory management of
This internally creates a main loop source using TimeoutSource and attaches it to the global MainContext using attach, so the callback will be invoked in whichever thread is running that main context. You can do these steps manually if you need greater control or to use a custom main context.
The interval given is in terms of monotonic time, not wall clock time. See get_monotonic_time.
the time between calls to the function, in milliseconds (1/1000ths of a second)
function to call
data to pass to
function to call when the timeout is removed, or null
the ID (greater than 0) of the event source.