#[no_mangle]
pub fn schedule(yield: bool) -> !Expand description
Schedule the envs. If yield, the current env will be moved to the tail
of the schedule list. Otherwise, the strategy will judge the rest time the
env will enjoy.
We use the priority to represent the time-slice count of a env. If the count run out, the next env will be selected.
§Return
The function is a no-return function. env_run will run the selected env.
§Panic
The list is empty when we should pick one env to run. Only in this situation, a panic will be raised.
§Safety
Actually, the list and the current env pointer SHALL be valid.