From ef9403371f2d4759cd7b0d0a276e63aae2ce68fe Mon Sep 17 00:00:00 2001
From: John Kåre Alsaker <john.kare.alsaker@gmail.com>
Date: Sat, 2 Mar 2024 18:32:42 +0100
Subject: Drop AST on a separate thread and prefetch `hir_crate`

---
 compiler/rustc_data_structures/src/sync/parallel.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'compiler/rustc_data_structures/src/sync/parallel.rs')

diff --git a/compiler/rustc_data_structures/src/sync/parallel.rs b/compiler/rustc_data_structures/src/sync/parallel.rs
index ba3c85ef5b1..64db39cc4c6 100644
--- a/compiler/rustc_data_structures/src/sync/parallel.rs
+++ b/compiler/rustc_data_structures/src/sync/parallel.rs
@@ -93,6 +93,17 @@ macro_rules! parallel {
         };
     }
 
+pub fn spawn(func: impl FnOnce() + DynSend + 'static) {
+    if mode::is_dyn_thread_safe() {
+        let func = FromDyn::from(func);
+        rayon_core::spawn(|| {
+            (func.into_inner())();
+        });
+    } else {
+        func()
+    }
+}
+
 // This function only works when `mode::is_dyn_thread_safe()`.
 pub fn scope<'scope, OP, R>(op: OP) -> R
 where
-- 
cgit 1.4.1-3-g733a5