mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
synced 2024-06-16 05:00:35 +00:00
230 lines
6.1 KiB
Rust
230 lines
6.1 KiB
Rust
// Copyright (C) 2018-2020 Sebastian Dröge <sebastian@centricular.com>
|
|
// Copyright (C) 2019-2021 François Laignel <fengalin@free.fr>
|
|
//
|
|
// This library is free software; you can redistribute it and/or
|
|
// modify it under the terms of the GNU Library General Public
|
|
// License as published by the Free Software Foundation; either
|
|
// version 2 of the License, or (at your option) any later version.
|
|
//
|
|
// This library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
// Library General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Library General Public
|
|
// License along with this library; if not, write to the
|
|
// Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
|
|
// Boston, MA 02110-1335, USA.
|
|
|
|
use futures::future::BoxFuture;
|
|
use futures::prelude::*;
|
|
|
|
use gst::{gst_log, gst_trace, gst_warning};
|
|
|
|
use pin_project_lite::pin_project;
|
|
|
|
use std::cell::Cell;
|
|
use std::collections::{HashMap, VecDeque};
|
|
use std::fmt;
|
|
use std::pin::Pin;
|
|
use std::sync::Arc;
|
|
use std::task::Poll;
|
|
|
|
use crate::runtime::RUNTIME_CAT;
|
|
|
|
thread_local! {
|
|
static CURRENT_TASK_ID: Cell<Option<TaskId>> = Cell::new(None);
|
|
}
|
|
|
|
#[derive(Clone, Copy, Eq, PartialEq, Hash, Debug)]
|
|
pub struct TaskId(pub(super) u64);
|
|
|
|
impl TaskId {
|
|
const LAST: TaskId = TaskId(u64::MAX);
|
|
|
|
fn next(task_id: Self) -> Self {
|
|
TaskId(task_id.0.wrapping_add(1))
|
|
}
|
|
|
|
pub(super) fn current() -> Option<TaskId> {
|
|
CURRENT_TASK_ID.try_with(Cell::get).ok().flatten()
|
|
}
|
|
}
|
|
|
|
pub type SubTaskOutput = Result<(), gst::FlowError>;
|
|
|
|
pin_project! {
|
|
pub(super) struct TaskFuture<F: Future> {
|
|
id: TaskId,
|
|
#[pin]
|
|
future: F,
|
|
}
|
|
|
|
}
|
|
|
|
impl<F: Future> TaskFuture<F> {
|
|
pub fn id(&self) -> TaskId {
|
|
self.id
|
|
}
|
|
}
|
|
|
|
impl<F: Future> Future for TaskFuture<F> {
|
|
type Output = F::Output;
|
|
|
|
fn poll(self: Pin<&mut Self>, cx: &mut std::task::Context<'_>) -> Poll<Self::Output> {
|
|
struct TaskIdGuard {
|
|
prev_task_id: Option<TaskId>,
|
|
}
|
|
|
|
impl Drop for TaskIdGuard {
|
|
fn drop(&mut self) {
|
|
let _ = CURRENT_TASK_ID.try_with(|cur| cur.replace(self.prev_task_id.take()));
|
|
}
|
|
}
|
|
|
|
let task_id = self.id;
|
|
let project = self.project();
|
|
|
|
let _guard = TaskIdGuard {
|
|
prev_task_id: CURRENT_TASK_ID.with(|cur| cur.replace(Some(task_id))),
|
|
};
|
|
|
|
project.future.poll(cx)
|
|
}
|
|
}
|
|
|
|
struct Task {
|
|
id: TaskId,
|
|
sub_tasks: VecDeque<BoxFuture<'static, SubTaskOutput>>,
|
|
}
|
|
|
|
impl Task {
|
|
fn new(id: TaskId) -> Self {
|
|
Task {
|
|
id,
|
|
sub_tasks: VecDeque::new(),
|
|
}
|
|
}
|
|
|
|
fn add_sub_task<T>(&mut self, sub_task: T)
|
|
where
|
|
T: Future<Output = SubTaskOutput> + Send + 'static,
|
|
{
|
|
self.sub_tasks.push_back(sub_task.boxed());
|
|
}
|
|
|
|
fn drain_sub_tasks(&mut self) -> VecDeque<BoxFuture<'static, SubTaskOutput>> {
|
|
std::mem::take(&mut self.sub_tasks)
|
|
}
|
|
}
|
|
|
|
impl fmt::Debug for Task {
|
|
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
fmt.debug_struct("Task")
|
|
.field("id", &self.id)
|
|
.field("sub_tasks len", &self.sub_tasks.len())
|
|
.finish()
|
|
}
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
pub(super) struct TaskQueue {
|
|
last_task_id: TaskId,
|
|
tasks: HashMap<TaskId, Task>,
|
|
context_name: Arc<str>,
|
|
}
|
|
|
|
impl TaskQueue {
|
|
pub fn new(context_name: Arc<str>) -> Self {
|
|
TaskQueue {
|
|
last_task_id: TaskId::LAST,
|
|
tasks: HashMap::default(),
|
|
context_name,
|
|
}
|
|
}
|
|
|
|
pub fn add<F: Future>(&mut self, future: F) -> TaskFuture<F> {
|
|
self.last_task_id = TaskId::next(self.last_task_id);
|
|
self.tasks
|
|
.insert(self.last_task_id, Task::new(self.last_task_id));
|
|
|
|
TaskFuture {
|
|
id: self.last_task_id,
|
|
future,
|
|
}
|
|
}
|
|
|
|
pub fn remove(&mut self, task_id: TaskId) {
|
|
if let Some(task) = self.tasks.remove(&task_id) {
|
|
if !task.sub_tasks.is_empty() {
|
|
gst_warning!(
|
|
RUNTIME_CAT,
|
|
"Task {:?} on context {} has {} pending sub tasks",
|
|
task_id,
|
|
self.context_name,
|
|
task.sub_tasks.len(),
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn has_sub_tasks(&self, task_id: TaskId) -> bool {
|
|
self.tasks
|
|
.get(&task_id)
|
|
.map(|t| !t.sub_tasks.is_empty())
|
|
.unwrap_or(false)
|
|
}
|
|
|
|
pub fn add_sub_task<T>(&mut self, task_id: TaskId, sub_task: T) -> Result<(), T>
|
|
where
|
|
T: Future<Output = SubTaskOutput> + Send + 'static,
|
|
{
|
|
match self.tasks.get_mut(&task_id) {
|
|
Some(task) => {
|
|
gst_trace!(
|
|
RUNTIME_CAT,
|
|
"Adding subtask to {:?} on context {}",
|
|
task_id,
|
|
self.context_name
|
|
);
|
|
task.add_sub_task(sub_task);
|
|
Ok(())
|
|
}
|
|
None => {
|
|
gst_trace!(RUNTIME_CAT, "Task was removed in the meantime");
|
|
Err(sub_task)
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn drain_sub_tasks(
|
|
&mut self,
|
|
task_id: TaskId,
|
|
) -> impl Future<Output = SubTaskOutput> + Send + 'static {
|
|
let sub_tasks = self
|
|
.tasks
|
|
.get_mut(&task_id)
|
|
.map(|task| (task.drain_sub_tasks(), Arc::clone(&self.context_name)));
|
|
|
|
async move {
|
|
if let Some((mut sub_tasks, context_name)) = sub_tasks {
|
|
if !sub_tasks.is_empty() {
|
|
gst_log!(
|
|
RUNTIME_CAT,
|
|
"Scheduling draining {} sub tasks from {:?} on '{}'",
|
|
sub_tasks.len(),
|
|
task_id,
|
|
&context_name,
|
|
);
|
|
|
|
for sub_task in sub_tasks.drain(..) {
|
|
sub_task.await?;
|
|
}
|
|
}
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
}
|
|
}
|