fedimint_core::task

Struct TaskGroup

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pub struct TaskGroup {
    inner: Arc<TaskGroupInner>,
}
Expand description

A group of task working together

Using this struct it is possible to spawn one or more main thread collaborating, which can cooperatively gracefully shut down, either due to external request, or failure of one of them.

Each thread should periodically check TaskHandle or rely on condition like channel disconnection to detect when it is time to finish.

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§inner: Arc<TaskGroupInner>

Implementations§

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impl TaskGroup

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pub fn new() -> Self

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pub fn make_handle(&self) -> TaskHandle

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pub fn make_subgroup(&self) -> Self

Create a sub-group

Task subgroup works like an independent TaskGroup, but the parent TaskGroup will propagate the shut down signal to a sub-group.

In contrast to using the parent group directly, a subgroup allows calling Self::join_all and detecting any panics on just a subset of tasks.

The code create a subgroup is responsible for calling Self::join_all. If it won’t, the parent subgroup will not detect any panics in the tasks spawned by the subgroup.

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pub fn shutdown(&self)

Tell all tasks in the group to shut down. This only initiates the shutdown process, it does not wait for the tasks to shut down.

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pub async fn shutdown_join_all( self, join_timeout: impl Into<Option<Duration>>, ) -> Result<(), Error>

Tell all tasks in the group to shut down and wait for them to finish.

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pub fn install_kill_handler(&self)

Add a task to the group that waits for CTRL+C or SIGTERM, then tells the rest of the task group to shut down.

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pub fn spawn<Fut, R>( &self, name: impl Into<String>, f: impl FnOnce(TaskHandle) -> Fut + MaybeSend + 'static, ) -> Receiver<R>
where Fut: Future<Output = R> + MaybeSend + 'static, R: MaybeSend + 'static,

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pub fn spawn_cancellable<R>( &self, name: impl Into<String>, future: impl Future<Output = R> + MaybeSend + 'static, ) -> Receiver<Result<R, ShuttingDownError>>
where R: MaybeSend + 'static,

Spawn a task that will get cancelled automatically on TaskGroup shutdown.

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pub async fn join_all(self, timeout: Option<Duration>) -> Result<(), Error>

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pub fn join_all_inner<'life0, 'async_recursion>( self, deadline: Option<SystemTime>, errors: &'life0 mut Vec<JoinError>, ) -> Pin<Box<dyn Future<Output = ()> + Send + 'async_recursion>>
where 'life0: 'async_recursion,

Trait Implementations§

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impl Clone for TaskGroup

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fn clone(&self) -> TaskGroup

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for TaskGroup

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for TaskGroup

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fn default() -> TaskGroup

Returns the “default value” for a type. Read more

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