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Run linking and incremental saving / finalizing in parallel #121880
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| use crate::jobserver; | ||
| use crate::sync::{mode, DynSend, FromDyn, IntoDynSyncSend}; | ||
| use parking_lot::Condvar; | ||
| use parking_lot::Mutex; | ||
| use std::any::Any; | ||
| use std::mem; | ||
| use std::panic::{self, AssertUnwindSafe}; | ||
| use std::sync::Arc; | ||
|
|
||
| enum TaskState<T: DynSend + 'static> { | ||
| Unexecuted(Box<dyn FnOnce() -> T + DynSend>), | ||
| Running, | ||
| Joined, | ||
| Result(Result<T, IntoDynSyncSend<Box<dyn Any + Send + 'static>>>), | ||
| } | ||
|
|
||
| struct TaskData<T: DynSend + 'static> { | ||
| state: Mutex<TaskState<T>>, | ||
| waiter: Condvar, | ||
| } | ||
|
|
||
| #[must_use] | ||
| pub struct Task<T: DynSend + 'static> { | ||
| data: Arc<TaskData<T>>, | ||
| } | ||
|
|
||
| /// This attempts to run a closure in a background thread. It returns a `Task` type which | ||
| /// you must call `join` on to ensure that the closure runs. | ||
| pub fn task<T: DynSend>(f: impl FnOnce() -> T + DynSend + 'static) -> Task<T> { | ||
| let task = Task { | ||
| data: Arc::new(TaskData { | ||
| state: Mutex::new(TaskState::Unexecuted(Box::new(f))), | ||
| waiter: Condvar::new(), | ||
| }), | ||
| }; | ||
|
|
||
| #[cfg(parallel_compiler)] | ||
| if mode::is_dyn_thread_safe() { | ||
| let data = FromDyn::from(task.data.clone()); | ||
|
|
||
| // Try to execute the task on a separate thread. | ||
| rayon::spawn(move || { | ||
| let data = data.into_inner(); | ||
| let mut state = data.state.lock(); | ||
| if matches!(*state, TaskState::Unexecuted(..)) { | ||
| if let TaskState::Unexecuted(f) = mem::replace(&mut *state, TaskState::Running) { | ||
| drop(state); | ||
| let result = panic::catch_unwind(AssertUnwindSafe(f)); | ||
|
|
||
| let unblock = { | ||
| let mut state = data.state.lock(); | ||
| let unblock = matches!(*state, TaskState::Joined); | ||
| *state = TaskState::Result(result.map_err(|e| IntoDynSyncSend(e))); | ||
| unblock | ||
| }; | ||
|
|
||
| if unblock { | ||
| rayon_core::mark_unblocked(&rayon_core::Registry::current()); | ||
| } | ||
|
|
||
| data.waiter.notify_one(); | ||
| } | ||
| } | ||
| }); | ||
| } | ||
|
|
||
| task | ||
| } | ||
|
|
||
| #[inline] | ||
| fn unwind<T>(result: Result<T, IntoDynSyncSend<Box<dyn Any + Send + 'static>>>) -> T { | ||
| match result { | ||
| Ok(r) => r, | ||
| Err(err) => panic::resume_unwind(err.0), | ||
| } | ||
| } | ||
|
|
||
| impl<T: DynSend> Task<T> { | ||
| pub fn join(self) -> T { | ||
| let mut state_guard = self.data.state.lock(); | ||
|
|
||
| match mem::replace(&mut *state_guard, TaskState::Joined) { | ||
| TaskState::Unexecuted(f) => f(), | ||
| TaskState::Result(result) => unwind(result), | ||
| TaskState::Running => { | ||
| #[cfg(parallel_compiler)] | ||
| rayon_core::mark_blocked(); | ||
| jobserver::release_thread(); | ||
|
|
||
| self.data.waiter.wait(&mut state_guard); | ||
|
|
||
| jobserver::acquire_thread(); | ||
|
|
||
| match mem::replace(&mut *state_guard, TaskState::Joined) { | ||
| TaskState::Result(result) => unwind(result), | ||
| _ => panic!(), | ||
| } | ||
| } | ||
| TaskState::Joined => panic!(), | ||
| } | ||
| } | ||
| } |
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Can we keep a timer for the entire time linking takes?
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We still have
link_cratewhich covers the codegen backend part of linking.