1 files changed, 22 insertions, 0 deletions
diff --git a/src/sync/runtime2_lockrank.go b/src/sync/runtime2_lockrank.go
new file mode 100644
index 0000000..cdb1af4
--- /dev/null
+++ b/src/sync/runtime2_lockrank.go
@@ -0,0 +1,22 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.staticlockranking
+
+package sync
+
+import "unsafe"
+
+// Approximation of notifyList in runtime/sema.go. Size and alignment must
+// agree.
+type notifyList struct {
+	wait   uint32
+	notify uint32
+	rank   int     // rank field of the mutex
+	pad    int     // pad field of the mutex
+	lock   uintptr // key field of the mutex
+
+	head unsafe.Pointer
+	tail unsafe.Pointer
+}