gst-plugins-rs/generic/threadshare/src/runtime/mod.rs
Sebastian Dröge 4ad101b53b Use once_cell crate directly again
The glib crate does not depend on it anymore and also does not re-export
it anymore.

Also switch some usages of OnceCell to OnceLock from std.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1441>
2024-01-31 18:07:57 +02:00

56 lines
2.3 KiB
Rust

// Copyright (C) 2019-2022 François Laignel <fengalin@free.fr>
//
// Take a look at the license at the top of the repository in the LICENSE file.
//! A `runtime` for the `threadshare` GStreamer plugins framework.
//!
//! Many `GStreamer` `Element`s internally spawn OS `thread`s. For most applications, this is not an
//! issue. However, in applications which process many `Stream`s in parallel, the high number of
//! `threads` leads to reduced efficiency due to:
//!
//! * context switches,
//! * scheduler overhead,
//! * most of the threads waiting for some resources to be available.
//!
//! The `threadshare` `runtime` is a framework to build `Element`s for such applications. It
//! uses light-weight threading to allow multiple `Element`s share a reduced number of OS `thread`s.
//!
//! See this [talk] ([slides]) for a presentation of the motivations and principles,
//! and this [blog post].
//!
//! Current implementation uses a custom executor mostly based on the [`smol`] ecosystem.
//!
//! Most `Element`s implementations should use the high-level features provided by [`PadSrc`] &
//! [`PadSink`].
//!
//! [talk]: https://gstconf.ubicast.tv/videos/when-adding-more-threads-adds-more-problems-thread-sharing-between-elements-in-gstreamer/
//! [slides]: https://gstreamer.freedesktop.org/data/events/gstreamer-conference/2018/Sebastian%20Dr%C3%B6ge%20-%20When%20adding%20more%20threads%20adds%20more%20problems:%20Thread-sharing%20between%20elements%20in%20GStreamer.pdf
//! [blog post]: https://coaxion.net/blog/2018/04/improving-gstreamer-performance-on-a-high-number-of-network-streams-by-sharing-threads-between-elements-with-rusts-tokio-crate
//! [`smol`]: https://github.com/smol-rs/
//! [`PadSrc`]: pad/struct.PadSrc.html
//! [`PadSink`]: pad/struct.PadSink.html
pub mod executor;
pub use executor::{timer, Async, Context, JoinHandle, SubTaskOutput};
pub mod pad;
pub use pad::{PadSink, PadSinkRef, PadSinkWeak, PadSrc, PadSrcRef, PadSrcWeak};
pub mod task;
pub use task::{Task, TaskState};
pub mod prelude {
pub use super::pad::{PadSinkHandler, PadSrcHandler};
pub use super::task::TaskImpl;
}
use once_cell::sync::Lazy;
static RUNTIME_CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
gst::DebugCategory::new(
"ts-runtime",
gst::DebugColorFlags::empty(),
Some("Thread-sharing Runtime"),
)
});