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-rw-r--r--pkg/sync/BUILD1
-rw-r--r--pkg/sync/spin_legacy_unsafe.go25
-rw-r--r--pkg/sync/spin_unsafe.go2
3 files changed, 27 insertions, 1 deletions
diff --git a/pkg/sync/BUILD b/pkg/sync/BUILD
index 410e9a3ca..5bd4d09d1 100644
--- a/pkg/sync/BUILD
+++ b/pkg/sync/BUILD
@@ -40,6 +40,7 @@ go_library(
"race_unsafe.go",
"rwmutex_unsafe.go",
"seqcount.go",
+ "spin_legacy_unsafe.go",
"spin_unsafe.go",
"sync.go",
],
diff --git a/pkg/sync/spin_legacy_unsafe.go b/pkg/sync/spin_legacy_unsafe.go
new file mode 100644
index 000000000..61fc7320e
--- /dev/null
+++ b/pkg/sync/spin_legacy_unsafe.go
@@ -0,0 +1,25 @@
+// 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 !go1.14
+
+package sync
+
+import (
+ "runtime"
+ _ "unsafe" // for go:linkname
+)
+
+//go:linkname canSpin sync.runtime_canSpin
+func canSpin(i int) bool
+
+//go:linkname doSpin sync.runtime_doSpin
+func doSpin()
+
+func goyield() {
+ // goyield is not available until Go 1.14.
+ runtime.Gosched()
+}
diff --git a/pkg/sync/spin_unsafe.go b/pkg/sync/spin_unsafe.go
index cafb2d065..18e8fc743 100644
--- a/pkg/sync/spin_unsafe.go
+++ b/pkg/sync/spin_unsafe.go
@@ -3,7 +3,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
-// +build go1.13
+// +build go1.14
// +build !go1.17
// Check go:linkname function signatures when updating Go version.