snapshot: sagernet/gvisor v0.0.0-20250811.0-sing-box-mod.1

Содержимое пина, зафиксированного в go.mod sing-box-lx, одним коммитом
без истории. Полная история SagerNet/gvisor — 1.45 ГБ и клонируется в
каждой CI-джобе; наша дельта — одна вставка в одну функцию, история для
неё не нужна.

Module path github.com/sagernet/gvisor сохранён намеренно: на него
опирается replace-директива суперпроекта.

Патч поверх — отдельным коммитом, чтобы дельта читалась одним git show
и переносилась на новый пин копированием.

SPECS/TASKS/048-GVISOR_HANDSHAKE_NIL_CRASH

pkg/syncevent/syncevent.go

@@ -0,0 +1,32 @@
+// Copyright 2020 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package syncevent provides efficient primitives for goroutine
+// synchronization based on event bitmasks.
+package syncevent
+
+// Set is a bitmask where each bit represents a distinct user-defined event.
+// The event package does not treat any bits in Set specially.
+type Set uint64
+
+const (
+	// NoEvents is a Set containing no events.
+	NoEvents = Set(0)
+
+	// AllEvents is a Set containing all possible events.
+	AllEvents = ^Set(0)
+
+	// MaxEvents is the number of distinct events that can be represented by a Set.
+	MaxEvents = 64
+)