use crate::{App, PlatformDispatcher, PlatformScheduler};use futures::channel::mpsc;use futures::prelude::*;use gpui_util::TryFutureExt;use scheduler::Instant;use scheduler::Scheduler;use std::{    fmt::Debug, future::Future, marker::PhantomData, mem, pin::Pin, rc::Rc, sync::Arc,    time::Duration,}; pub use scheduler::{FallibleTask, ForegroundExecutor as SchedulerForegroundExecutor, Priority}; /// A pointer to the executor that is currently running,/// for spawning background tasks.#[derive(Clone)]pub struct BackgroundExecutor {    inner: scheduler::BackgroundExecutor,    dispatcher: Arc<dyn PlatformDispatcher>,} /// A pointer to the executor that is currently running,/// for spawning tasks on the main thread.#[derive(Clone)]pub struct ForegroundExecutor {    inner: scheduler::ForegroundExecutor,    dispatcher: Arc<dyn PlatformDispatcher>,    not_send: PhantomData<Rc<()>>,} /// Task is a primitive that allows work to happen in the background.////// It implements [`Future`] so you can `.await` on it.////// If you drop a task it will be cancelled immediately. Calling [`Task::detach`] allows/// the task to continue running, but with no way to return a value.#[must_use]#[derive(Debug)]pub struct Task<T>(scheduler::Task<T>); impl<T> Task<T> {    /// Creates a new task that will resolve with the value.    pub fn ready(val: T) -> Self {        Task(scheduler::Task::ready(val))    }     /// Returns true if the task has completed or was created with `Task::ready`.    pub fn is_ready(&self) -> bool {        self.0.is_ready()    }     /// Detaching a task runs it to completion in the background.    pub fn detach(self) {        self.0.detach()    }     /// Wraps a scheduler::Task.    pub fn from_scheduler(task: scheduler::Task<T>) -> Self {        Task(task)    }     /// Converts this task into a fallible task that returns `Option<T>`.    ///    /// Unlike the standard `Task<T>`, a [`FallibleTask`] will return `None`    /// if the task was cancelled.    ///    /// # Example    ///    /// ```ignore    /// // Background task that gracefully handles cancellation:    /// cx.background_spawn(async move {    ///     let result = foreground_task.fallible().await;    ///     if let Some(value) = result {    ///         // Process the value    ///     }    ///     // If None, task was cancelled - just exit gracefully    /// }).detach();    /// ```    pub fn fallible(self) -> FallibleTask<T> {        self.0.fallible()    }} impl<T, E> Task<Result<T, E>>where    T: 'static,    E: 'static + Debug,{    /// Run the task to completion in the background and log any errors that occur.    #[track_caller]    pub fn detach_and_log_err(self, cx: &App) {        let location = core::panic::Location::caller();        cx.foreground_executor()            .spawn(self.log_tracked_err(*location))            .detach();    }} impl<T> std::future::Future for Task<T> {    type Output = T;     fn poll(        self: std::pin::Pin<&mut Self>,        cx: &mut std::task::Context<'_>,    ) -> std::task::Poll<Self::Output> {        // SAFETY: Task is a repr(transparent) wrapper around scheduler::Task,        // and we're just projecting the pin through to the inner task.        let inner = unsafe { self.map_unchecked_mut(|t| &mut t.0) };        inner.poll(cx)    }} impl BackgroundExecutor {    /// Creates a new BackgroundExecutor from the given PlatformDispatcher.    pub fn new(dispatcher: Arc<dyn PlatformDispatcher>) -> Self {        #[cfg(any(test, feature = "test-support"))]        let scheduler: Arc<dyn Scheduler> = if let Some(test_dispatcher) = dispatcher.as_test() {            test_dispatcher.scheduler().clone()        } else {            Arc::new(PlatformScheduler::new(dispatcher.clone()))        };         #[cfg(not(any(test, feature = "test-support")))]        let scheduler: Arc<dyn Scheduler> = Arc::new(PlatformScheduler::new(dispatcher.clone()));         Self {            inner: scheduler::BackgroundExecutor::new(scheduler),            dispatcher,        }    }     /// Returns the underlying scheduler::BackgroundExecutor.    ///    /// This is used by Ex to pass the executor to thread/worktree code.    pub fn scheduler_executor(&self) -> scheduler::BackgroundExecutor {        self.inner.clone()    }     /// Enqueues the given future to be run to completion on a background thread.    #[track_caller]    pub fn spawn<R>(&self, future: impl Future<Output = R> + Send + 'static) -> Task<R>    where        R: Send + 'static,    {        self.spawn_with_priority(Priority::default(), future.boxed())    }     /// Enqueues the given future to be run to completion on a background thread with the given priority.    ///    /// When `Priority::RealtimeAudio` is used, the task runs on a dedicated thread with    /// realtime scheduling priority, suitable for audio processing.    #[track_caller]    pub fn spawn_with_priority<R>(        &self,        priority: Priority,        future: impl Future<Output = R> + Send + 'static,    ) -> Task<R>    where        R: Send + 'static,    {        if priority == Priority::RealtimeAudio {            Task::from_scheduler(self.inner.spawn_realtime(future))        } else {            Task::from_scheduler(self.inner.spawn_with_priority(priority, future))        }    }     /// Enqueues the given future to be run to completion on a background thread and blocking the current task on it.    ///    /// This allows to spawn background work that borrows from its scope. Note that the supplied future will run to    /// completion before the current task is resumed, even if the current task is slated for cancellation.    pub async fn await_on_background<R>(&self, future: impl Future<Output = R> + Send) -> R    where        R: Send,    {        use crate::RunnableMeta;        use parking_lot::{Condvar, Mutex};         struct NotifyOnDrop<'a>(&'a (Condvar, Mutex<bool>));         impl Drop for NotifyOnDrop<'_> {            fn drop(&mut self) {                *self.0.1.lock() = true;                self.0.0.notify_all();            }        }         struct WaitOnDrop<'a>(&'a (Condvar, Mutex<bool>));         impl Drop for WaitOnDrop<'_> {            fn drop(&mut self) {                let mut done = self.0.1.lock();                if !*done {                    self.0.0.wait(&mut done);                }            }        }         let dispatcher = self.dispatcher.clone();        let location = core::panic::Location::caller();         let pair = &(Condvar::new(), Mutex::new(false));        let _wait_guard = WaitOnDrop(pair);         let (runnable, task) = unsafe {            async_task::Builder::new()                .metadata(RunnableMeta { location })                .spawn_unchecked(                    move |_| async {                        let _notify_guard = NotifyOnDrop(pair);                        future.await                    },                    move |runnable| {                        dispatcher.dispatch(runnable, Priority::default());                    },                )        };        runnable.schedule();        task.await    }     /// Scoped lets you start a number of tasks and waits    /// for all of them to complete before returning.    pub async fn scoped<'scope, F>(&self, scheduler: F)    where        F: FnOnce(&mut Scope<'scope>),    {        let mut scope = Scope::new(self.clone(), Priority::default());        (scheduler)(&mut scope);        let spawned = mem::take(&mut scope.futures)            .into_iter()            .map(|f| self.spawn_with_priority(scope.priority, f))            .collect::<Vec<_>>();        for task in spawned {            task.await;        }    }     /// Scoped lets you start a number of tasks and waits    /// for all of them to complete before returning.    pub async fn scoped_priority<'scope, F>(&self, priority: Priority, scheduler: F)    where        F: FnOnce(&mut Scope<'scope>),    {        let mut scope = Scope::new(self.clone(), priority);        (scheduler)(&mut scope);        let spawned = mem::take(&mut scope.futures)            .into_iter()            .map(|f| self.spawn_with_priority(scope.priority, f))            .collect::<Vec<_>>();        for task in spawned {            task.await;        }    }     /// Get the current time.    ///    /// Calling this instead of `std::time::Instant::now` allows the use    /// of fake timers in tests.    pub fn now(&self) -> Instant {        self.inner.scheduler().clock().now()    }     /// Returns a task that will complete after the given duration.    /// Depending on other concurrent tasks the elapsed duration may be longer    /// than requested.    #[track_caller]    pub fn timer(&self, duration: Duration) -> Task<()> {        if duration.is_zero() {            return Task::ready(());        }        self.spawn(self.inner.scheduler().timer(duration))    }     /// In tests, run an arbitrary number of tasks (determined by the SEED environment variable)    #[cfg(any(test, feature = "test-support"))]    pub fn simulate_random_delay(&self) -> impl Future<Output = ()> + use<> {        self.dispatcher.as_test().unwrap().simulate_random_delay()    }     /// In tests, move time forward. This does not run any tasks, but does make `timer`s ready.    #[cfg(any(test, feature = "test-support"))]    pub fn advance_clock(&self, duration: Duration) {        self.dispatcher.as_test().unwrap().advance_clock(duration)    }     /// In tests, run one task.    #[cfg(any(test, feature = "test-support"))]    pub fn tick(&self) -> bool {        self.dispatcher.as_test().unwrap().scheduler().tick()    }     /// In tests, run tasks until the scheduler would park.    ///    /// Under the scheduler-backed test dispatcher, `tick()` will not advance the clock, so a pending    /// timer can keep `has_pending_tasks()` true even after all currently-runnable tasks have been    /// drained. To preserve the historical semantics that tests relied on (drain all work that can    /// make progress), we advance the clock to the next timer when no runnable tasks remain.    #[cfg(any(test, feature = "test-support"))]    pub fn run_until_parked(&self) {        let scheduler = self.dispatcher.as_test().unwrap().scheduler();        scheduler.run();    }     /// In tests, prevents `run_until_parked` from panicking if there are outstanding tasks.    #[cfg(any(test, feature = "test-support"))]    pub fn allow_parking(&self) {        self.dispatcher            .as_test()            .unwrap()            .scheduler()            .allow_parking();         if std::env::var("GPUI_RUN_UNTIL_PARKED_LOG").ok().as_deref() == Some("1") {            log::warn!("[gpui::executor] allow_parking: enabled");        }    }     /// Sets the range of ticks to run before timing out in block_on.    #[cfg(any(test, feature = "test-support"))]    pub fn set_block_on_ticks(&self, range: std::ops::RangeInclusive<usize>) {        self.dispatcher            .as_test()            .unwrap()            .scheduler()            .set_timeout_ticks(range);    }     /// Undoes the effect of [`Self::allow_parking`].    #[cfg(any(test, feature = "test-support"))]    pub fn forbid_parking(&self) {        self.dispatcher            .as_test()            .unwrap()            .scheduler()            .forbid_parking();    }     /// In tests, returns the rng used by the dispatcher.    #[cfg(any(test, feature = "test-support"))]    pub fn rng(&self) -> scheduler::SharedRng {        self.dispatcher.as_test().unwrap().scheduler().rng()    }     /// How many CPUs are available to the dispatcher.    pub fn num_cpus(&self) -> usize {        #[cfg(any(test, feature = "test-support"))]        if let Some(test) = self.dispatcher.as_test() {            return test.num_cpus_override().unwrap_or(4);        }        num_cpus::get()    }     /// Override the number of CPUs reported by this executor in tests.    /// Panics if not called on a test executor.    #[cfg(any(test, feature = "test-support"))]    pub fn set_num_cpus(&self, count: usize) {        self.dispatcher            .as_test()            .expect("set_num_cpus can only be called on a test executor")            .set_num_cpus(count);    }     /// Whether we're on the main thread.    pub fn is_main_thread(&self) -> bool {        self.dispatcher.is_main_thread()    }     #[doc(hidden)]    pub fn dispatcher(&self) -> &Arc<dyn PlatformDispatcher> {        &self.dispatcher    }} impl ForegroundExecutor {    /// Creates a new ForegroundExecutor from the given PlatformDispatcher.    pub fn new(dispatcher: Arc<dyn PlatformDispatcher>) -> Self {        #[cfg(any(test, feature = "test-support"))]        let (scheduler, session_id): (Arc<dyn Scheduler>, _) =            if let Some(test_dispatcher) = dispatcher.as_test() {                (                    test_dispatcher.scheduler().clone(),                    test_dispatcher.session_id(),                )            } else {                let platform_scheduler = Arc::new(PlatformScheduler::new(dispatcher.clone()));                let session_id = platform_scheduler.allocate_session_id();                (platform_scheduler, session_id)            };         #[cfg(not(any(test, feature = "test-support")))]        let (scheduler, session_id): (Arc<dyn Scheduler>, _) = {            let platform_scheduler = Arc::new(PlatformScheduler::new(dispatcher.clone()));            let session_id = platform_scheduler.allocate_session_id();            (platform_scheduler, session_id)        };         let inner = scheduler::ForegroundExecutor::new(session_id, scheduler);         Self {            inner,            dispatcher,            not_send: PhantomData,        }    }     /// Enqueues the given Task to run on the main thread.    #[track_caller]    pub fn spawn<R>(&self, future: impl Future<Output = R> + 'static) -> Task<R>    where        R: 'static,    {        Task::from_scheduler(self.inner.spawn(future.boxed_local()))    }     /// Enqueues the given Task to run on the main thread with the given priority.    #[track_caller]    pub fn spawn_with_priority<R>(        &self,        _priority: Priority,        future: impl Future<Output = R> + 'static,    ) -> Task<R>    where        R: 'static,    {        // Priority is ignored for foreground tasks - they run in order on the main thread        Task::from_scheduler(self.inner.spawn(future))    }     /// Used by the test harness to run an async test in a synchronous fashion.    #[cfg(any(test, feature = "test-support"))]    #[track_caller]    pub fn block_test<R>(&self, future: impl Future<Output = R>) -> R {        use std::cell::Cell;         let scheduler = self.inner.scheduler();         let output = Cell::new(None);        let future = async {            output.set(Some(future.await));        };        let mut future = std::pin::pin!(future);         // In async GPUI tests, we must allow foreground tasks scheduled by the test itself        // (which are associated with the test session) to make progress while we block.        // Otherwise, awaiting futures that depend on same-session foreground work can deadlock.        scheduler.block(None, future.as_mut(), None);         output.take().expect("block_test future did not complete")    }     /// Block the current thread until the given future resolves.    /// Consider using `block_with_timeout` instead.    pub fn block_on<R>(&self, future: impl Future<Output = R>) -> R {        self.inner.block_on(future)    }     /// Block the current thread until the given future resolves or the timeout elapses.    pub fn block_with_timeout<R, Fut: Future<Output = R>>(        &self,        duration: Duration,        future: Fut,    ) -> Result<R, impl Future<Output = R> + use<R, Fut>> {        self.inner.block_with_timeout(duration, future)    }     #[doc(hidden)]    pub fn dispatcher(&self) -> &Arc<dyn PlatformDispatcher> {        &self.dispatcher    }     #[doc(hidden)]    pub fn scheduler_executor(&self) -> SchedulerForegroundExecutor {        self.inner.clone()    }} /// Scope manages a set of tasks that are enqueued and waited on together. See [`BackgroundExecutor::scoped`].pub struct Scope<'a> {    executor: BackgroundExecutor,    priority: Priority,    futures: Vec<Pin<Box<dyn Future<Output = ()> + Send + 'static>>>,    tx: Option<mpsc::Sender<()>>,    rx: mpsc::Receiver<()>,    lifetime: PhantomData<&'a ()>,} impl<'a> Scope<'a> {    fn new(executor: BackgroundExecutor, priority: Priority) -> Self {        let (tx, rx) = mpsc::channel(1);        Self {            executor,            priority,            tx: Some(tx),            rx,            futures: Default::default(),            lifetime: PhantomData,        }    } 

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