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//! [ArceOS](https://github.com/arceos-org/arceos) task management module.
//!
//! This module provides primitives for task management, including task
//! creation, scheduling, sleeping, termination, etc. The scheduler algorithm
//! is configurable by cargo features.
//!
//! # Cargo Features
//!
//! - `multitask`: Enable multi-task support. If it's enabled, complex task
//! management and scheduling is used, as well as more task-related APIs.
//! Otherwise, only a few APIs with naive implementation is available.
//! - `irq`: Interrupts are enabled. If this feature is enabled, timer-based
//! APIs can be used, such as [`sleep`], [`sleep_until`], and
//! [`WaitQueue::wait_timeout`].
//! - `preempt`: Enable preemptive scheduling.
//! - `sched-fifo`: Use the [FIFO cooperative scheduler][1]. It also enables the
//! `multitask` feature if it is enabled. This feature is enabled by default,
//! and it can be overriden by other scheduler features.
//! - `sched-rr`: Use the [Round-robin preemptive scheduler][2]. It also enables
//! the `multitask` and `preempt` features if it is enabled.
//! - `sched-cfs`: Use the [Completely Fair Scheduler][3]. It also enables the
//! the `multitask` and `preempt` features if it is enabled.
//!
//! [1]: ax_sched::FifoScheduler
//! [2]: ax_sched::RRScheduler
//! [3]: ax_sched::CFScheduler
cfg_if!