# TaskManager in os::task - Rust
API documentation for the Rust `TaskManager` struct in crate `os`.
Keywords: rust, rustlang, rust-lang, TaskManager

# Struct os::task::TaskManager

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    pub struct TaskManager {
        num_app: usize,
        inner: UPSafeCell<TaskManagerInner>,
    }

## Fields

`num_app: usize`

total number of tasks

`inner: UPSafeCell<TaskManagerInner>`

use inner value to get mutable access

## Implementations

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### impl TaskManager

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#### fn run_first_task(&self) -> !

Run the first task in task list.

Generally, the first task in task list is an idle task (we call it zero process later). But in ch3, we load apps statically, so the first task is a real app.

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#### fn mark_current_suspended(&self)

Change the status of current `Running` task into `Ready`.

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#### fn mark_current_exited(&self)

Change the status of current `Running` task into `Exited`.

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#### fn find_next_task(&self) -> Option<usize>

Find next task to run and return app id.

In this case, we only return the first `Ready` task in task list.

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#### fn run_next_task(&self)

Switch current `Running` task to the task we have found, or there is no `Ready` task and we can exit with all applications completed

## Auto Trait Implementations

### impl !RefUnwindSafe for TaskManager

### impl Send for TaskManager

### impl Sync for TaskManager

### impl Unpin for TaskManager

### impl UnwindSafe for TaskManager

## Blanket Implementations

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### impl<T> Any for T where
T: 'static + ?Sized,

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#### pub fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more

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### impl<T> Borrow<T> for T where
T: ?Sized,

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#### pub fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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### impl<T> BorrowMut<T> for T where
T: ?Sized,

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#### pub fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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### impl<T> From<T> for T

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#### pub fn from(t: T) -> T

Performs the conversion.

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### impl<T, U> Into<U> for T where
U: From<T>,

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#### pub fn into(self) -> U

Performs the conversion.

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### impl<T, U> TryFrom<U> for T where
U: Into<T>,

#### type Error = Infallible

The type returned in the event of a conversion error.

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#### pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

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### impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

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#### pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.