From 77aa209b386a184e7f4b44938f2a05a1b5c5a3cf Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Thu, 10 Jun 2021 15:35:05 -0700
Subject: [PATCH] runtime: loop on EINTR in macOS sigNoteSleep

Fixes #46466

Change-Id: I8fb15d0c8ef7ef6e6fc1b9e0e033d213255fe0df
Reviewed-on: https://go-review.googlesource.com/c/go/+/326778
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
---
 src/runtime/os_darwin.go | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/runtime/os_darwin.go b/src/runtime/os_darwin.go
index 00139351ab..079be107d7 100644
--- a/src/runtime/os_darwin.go
+++ b/src/runtime/os_darwin.go
@@ -118,10 +118,15 @@ func sigNoteWakeup(*note) {
 
 // sigNoteSleep waits for a note created by sigNoteSetup to be woken.
 func sigNoteSleep(*note) {
-	entersyscallblock()
-	var b byte
-	read(sigNoteRead, unsafe.Pointer(&b), 1)
-	exitsyscall()
+	for {
+		var b byte
+		entersyscallblock()
+		n := read(sigNoteRead, unsafe.Pointer(&b), 1)
+		exitsyscall()
+		if n != -_EINTR {
+			return
+		}
+	}
 }
 
 // BSD interface for threading.
-- 
2.50.0