Task execution related traits and utilities.
In the Tokio execution model, futures are lazy. When a future is created, no work is performed. In order for the work defined by the future to happen, the future must be submitted to an executor. A future that is submitted to an executor is called a "task".
The executor is responsible for ensuring that [Future::poll] is called
whenever the task is [notified]. Notification happens when the internal state of
a task transitions from "not ready" to ready. For example, a socket might have
received data and a call to read will now be able to succeed.
This crate provides traits and utilities that are necessary for building an executor, including:
The [Executor] trait describes the API for spawning a future onto an
executor.
[enter] marks that the the current thread is entering an execution
context. This prevents a second executor from accidentally starting from
within the context of one that is already running.
[DefaultExecutor] spawns tasks onto the default executor for the current
context.
[Park] abstracts over blocking and unblocking the current thread.
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