Struct glib::ThreadPool

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pub struct ThreadPool(_);
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The ThreadPool struct represents a thread pool. It has three public read-only members, but the underlying struct is bigger, so you must not copy this struct.

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impl ThreadPool

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pub fn shared(max_threads: Option<u32>) -> Result<Self, Error>

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pub fn exclusive(max_threads: u32) -> Result<Self, Error>

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pub fn push<F: FnOnce() + Send + 'static>(&self, func: F) -> Result<(), Error>

Inserts data into the list of tasks to be executed by self.

When the number of currently running threads is lower than the maximal allowed number of threads, a new thread is started (or reused) with the properties given to [new()][Self::new()]. Otherwise, data stays in the queue until a thread in this pool finishes its previous task and processes data.

error can be None to ignore errors, or non-None to report errors. An error can only occur when a new thread couldn’t be created. In that case data is simply appended to the queue of work to do.

Before version 2.32, this function did not return a success status.

Returns

true on success, false if an error occurred

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pub fn push_future<T: Send + 'static, F: FnOnce() -> T + Send + 'static>( &self, func: F ) -> Result<impl Future<Output = T> + Send + Sync + 'static, Error>

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pub fn set_max_threads(&self, max_threads: Option<u32>) -> Result<(), Error>

Sets the maximal allowed number of threads for self. A value of -1 means that the maximal number of threads is unlimited. If self is an exclusive thread pool, setting the maximal number of threads to -1 is not allowed.

Setting max_threads to 0 means stopping all work for self. It is effectively frozen until max_threads is set to a non-zero value again.

A thread is never terminated while calling func, as supplied by [new()][Self::new()]. Instead the maximal number of threads only has effect for the allocation of new threads in push(). A new thread is allocated, whenever the number of currently running threads in self is smaller than the maximal number.

error can be None to ignore errors, or non-None to report errors. An error can only occur when a new thread couldn’t be created.

Before version 2.32, this function did not return a success status.

max_threads

a new maximal number of threads for self, or -1 for unlimited

Returns

true on success, false if an error occurred

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pub fn max_threads(&self) -> Option<u32>

Returns the maximal number of threads for self.

Returns

the maximal number of threads

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pub fn num_threads(&self) -> u32

Returns the number of threads currently running in self.

Returns

the number of threads currently running

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pub fn unprocessed(&self) -> u32

Returns the number of tasks still unprocessed in self.

Returns

the number of unprocessed tasks

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pub fn set_max_unused_threads(max_threads: Option<u32>)

Sets the maximal number of unused threads to max_threads. If max_threads is -1, no limit is imposed on the number of unused threads.

The default value is 2.

max_threads

maximal number of unused threads

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pub fn max_unused_threads() -> Option<u32>

Returns the maximal allowed number of unused threads.

Returns

the maximal number of unused threads

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pub fn num_unused_threads() -> u32

Returns the number of currently unused threads.

Returns

the number of currently unused threads

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pub fn stop_unused_threads()

Stops all currently unused threads. This does not change the maximal number of unused threads. This function can be used to regularly stop all unused threads e.g. from g_timeout_add().

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pub fn set_max_idle_time(max_idle_time: u32)

This function will set the maximum interval that a thread waiting in the pool for new tasks can be idle for before being stopped. This function is similar to calling stop_unused_threads() on a regular timeout, except this is done on a per thread basis.

By setting interval to 0, idle threads will not be stopped.

The default value is 15000 (15 seconds).

interval

the maximum interval (in milliseconds) a thread can be idle

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pub fn max_idle_time() -> u32

This function will return the maximum interval that a thread will wait in the thread pool for new tasks before being stopped.

If this function returns 0, threads waiting in the thread pool for new work are not stopped.

Returns

the maximum interval (milliseconds) to wait for new tasks in the thread pool before stopping the thread

Trait Implementations§

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impl Debug for ThreadPool

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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 Drop for ThreadPool

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fn drop(&mut self)

Executes the destructor for this type. Read more
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impl Send for ThreadPool

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impl Sync for ThreadPool

Auto Trait Implementations§

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

const: unstable · source§

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

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

const: unstable · source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

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 Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
const: unstable · source§

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

Performs the conversion.