pub fn enter() -> Result<Enter, EnterError>Expand description
Marks the current thread as being within the dynamic extent of an executor.
Executor implementations should call this function before beginning to
execute tasks and drop the returned Enter value after
completing task execution:
let enter = enter().expect("...");
/* run task */
drop(enter);Doing so ensures that executors aren’t accidentally invoked in a nested fashion.
§Error
Returns an error if the current thread is already marked, in which case the caller should panic with a tailored error message.