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//! [ArceOS](https://github.com/rcore-os/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]: scheduler::FifoScheduler
//! [2]: scheduler::RRScheduler
//! [3]: scheduler::CFScheduler

#![cfg_attr(not(test), no_std)]
#![feature(doc_cfg)]
#![feature(doc_auto_cfg)]
#![feature(stmt_expr_attributes)]
cfg_if::cfg_if! {
    if #[cfg(feature = "multitask")] {
        #[macro_use]
        extern crate log;
        extern crate alloc;

        mod run_queue;
        pub use run_queue::{IDLE_TASK, RUN_QUEUE, EXITED_TASKS, VforkSet};
        mod task;
        pub use task::{TaskState, VforkCheck};
        mod api;
        mod wait_queue;
        mod stat;

        #[cfg(feature = "signal")]
        pub use stat::SignalCaller;
        pub use task::{SchedPolicy, SchedStatus};

        #[cfg(feature = "irq")]
        mod timers;

        #[doc(cfg(feature = "multitask"))]
        pub use self::api::*;
        pub use self::api::{sleep, sleep_until, yield_now};
    } else {
        mod api_s;
        pub use self::api_s::{sleep, sleep_until, yield_now};
    }
}