Function execute_task 

pub fn execute_task<L, F, G>(
    locked: &mut Locked<L>,
    task_builder: TaskBuilder,
    pre_run: F,
    task_complete: G,
    ptrace_state: Option<PtraceCoreState>,
) -> Result<(), Errno>
where
    L: LockBefore<TaskRelease>,
    F: FnOnce(&mut Locked<Unlocked>, &mut CurrentTask) -> Result<(), Errno> + Send + Sync + 'static,
    G: FnOnce(Result<ExitStatus, Error>) + Send + Sync + 'static,