From 2b6d99468d4d988fd5f5ea3e9be41a3dc95a1291 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Fri, 10 Jul 2020 10:51:40 -0700
Subject: libgo: update to Go 1.14.4 release

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/241999
---
 libgo/go/runtime/proc.go | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'libgo/go/runtime/proc.go')

diff --git a/libgo/go/runtime/proc.go b/libgo/go/runtime/proc.go
index f75cacf..e098137 100644
--- a/libgo/go/runtime/proc.go
+++ b/libgo/go/runtime/proc.go
@@ -1704,10 +1704,16 @@ func startTemplateThread() {
 	if GOARCH == "wasm" { // no threads on wasm yet
 		return
 	}
+
+	// Disable preemption to guarantee that the template thread will be
+	// created before a park once haveTemplateThread is set.
+	mp := acquirem()
 	if !atomic.Cas(&newmHandoff.haveTemplateThread, 0, 1) {
+		releasem(mp)
 		return
 	}
 	newm(templateThread, nil)
+	releasem(mp)
 }
 
 // templateThread is a thread in a known-good state that exists solely
-- 
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