From d068c2cb620c1daeedc8b9cce488af45a6c2c889 Mon Sep 17 00:00:00 2001
From: Andy Pan <panjf2000@gmail.com>
Date: Fri, 2 Feb 2024 11:22:57 +0800
Subject: runtime: use eventfd as the event wait/notify mechanism for epoll

Fixes #65443

Change-Id: I9ad4689b36e87ee930d35a38322a8797896483b4
Reviewed-on: https://go-review.googlesource.com/c/go/+/560615
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Jorropo <jorropo.pgm@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
---
 src/runtime/internal/syscall/syscall_linux.go | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/runtime/internal/syscall/syscall_linux.go')

diff --git a/src/runtime/internal/syscall/syscall_linux.go b/src/runtime/internal/syscall/syscall_linux.go
index 7209634edb..cb88659394 100644
--- a/src/runtime/internal/syscall/syscall_linux.go
+++ b/src/runtime/internal/syscall/syscall_linux.go
@@ -60,3 +60,8 @@ func EpollCtl(epfd, op, fd int32, event *EpollEvent) (errno uintptr) {
 	_, _, e := Syscall6(SYS_EPOLL_CTL, uintptr(epfd), uintptr(op), uintptr(fd), uintptr(unsafe.Pointer(event)), 0, 0)
 	return e
 }
+
+func Eventfd(initval, flags int32) (fd int32, errno uintptr) {
+	r1, _, e := Syscall6(SYS_EVENTFD2, uintptr(initval), uintptr(flags), 0, 0, 0, 0)
+	return int32(r1), e
+}
-- 
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