1 files changed, 24 insertions, 0 deletions
diff --git a/pkg/sync/spin_unsafe.go b/pkg/sync/spin_unsafe.go
new file mode 100644
index 000000000..f721449e3
--- /dev/null
+++ b/pkg/sync/spin_unsafe.go
@@ -0,0 +1,24 @@
+// Copyright 2020 The gVisor Authors.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build go1.13
+// +build !go1.16
+
+// Check go:linkname function signatures when updating Go version.
+
+package sync
+
+import (
+	_ "unsafe" // for go:linkname
+)
+
+//go:linkname canSpin sync.runtime_canSpin
+func canSpin(i int) bool
+
+//go:linkname doSpin sync.runtime_doSpin
+func doSpin()
+
+//go:linkname goyield runtime.goyield
+func goyield()