From 62e779f82d7c9427c33484baa676c09a1917b0d6 Mon Sep 17 00:00:00 2001
From: Matt Mastracci <matthew@mastracci.com>
Date: Wed, 17 May 2023 15:49:57 -0600
Subject: fix(runtime): Box the main future to avoid blowing up the stack
 (#19155)

This fixes `Unhandled exception at [...] Stack overflow` on Windows,
caused by the large size of the main future.
---
 core/task.rs | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'core')

diff --git a/core/task.rs b/core/task.rs
index 46a4c8c26..3e728a08f 100644
--- a/core/task.rs
+++ b/core/task.rs
@@ -44,6 +44,7 @@ impl<R> Future for JoinHandle<R> {
 /// Equivalent to [`tokio::task::spawn`], but does not require the future to be [`Send`]. Must only be
 /// used on a [`RuntimeFlavor::CurrentThread`] executor, though this is only checked when running with
 /// debug assertions.
+#[inline(always)]
 pub fn spawn<F: Future<Output = R> + 'static, R: 'static>(
   f: F,
 ) -> JoinHandle<R> {
@@ -60,6 +61,7 @@ pub fn spawn<F: Future<Output = R> + 'static, R: 'static>(
 
 /// Equivalent to [`tokio::task::spawn_blocking`]. Currently a thin wrapper around the tokio API, but this
 /// may change in the future.
+#[inline(always)]
 pub fn spawn_blocking<
   F: (FnOnce() -> R) + Send + 'static,
   R: Send + 'static,
@@ -89,6 +91,7 @@ impl<R> MaskResultAsSend<R> {
   }
 }
 
+#[repr(transparent)]
 pub struct MaskFutureAsSend<F> {
   future: F,
 }
@@ -102,6 +105,7 @@ impl<F> MaskFutureAsSend<F> {
   ///
   /// You must ensure that the future is actually used on the same
   /// thread, ie. always use current thread runtime flavor from Tokio.
+  #[inline(always)]
   pub unsafe fn new(future: F) -> Self {
     Self { future }
   }
-- 
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