Module sched
A generally useful event scheduler class.
Each instance of this class manages its own queue. No multi-threading
is implied; you are supposed to hack that yourself, or use a single
instance per application.
Each instance is parametrized with two functions, one that is supposed
to return the current time, one that is supposed to implement a delay.
You can implement real-time scheduling by substituting time and sleep
from built-in module time, or you can implement simulated time by writing
your own functions. This can also be used to integrate scheduling with
STDWIN events; the delay function is allowed to modify the queue. Time
can be expressed as integers or floating point numbers, as long as it is
consistent.
Events are specified by tuples (time, priority, action, argument). As
in UNIX, lower priority numbers mean higher priority; in this way the
queue can be maintained as a priority queue. Execution of the event
means calling the action function, passing it the argument. Remember that
in Python, multiple function arguments can be packed in a tuple. The
action function may be an instance method so it has another way to
reference private data (besides global variables). Parameterless
functions or methods cannot be used, however.
Imports:
heapq