1 files changed, 85 insertions, 0 deletions
diff --git a/tools/checklocks/test/globals.go b/tools/checklocks/test/globals.go
new file mode 100644
index 000000000..656b0c9a3
--- /dev/null
+++ b/tools/checklocks/test/globals.go
@@ -0,0 +1,85 @@
+// 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 test
+
+import (
+	"sync"
+)
+
+var (
+	globalMu   sync.Mutex
+	globalRWMu sync.RWMutex
+)
+
+var globalStruct struct {
+	mu sync.Mutex
+	// +checklocks:mu
+	guardedField int
+}
+
+var otherStruct struct {
+	// +checklocks:globalMu
+	guardedField1 int
+	// +checklocks:globalRWMu
+	guardedField2 int
+	// +checklocks:globalStruct.mu
+	guardedField3 int
+}
+
+func testGlobalValid() {
+	globalMu.Lock()
+	otherStruct.guardedField1 = 1
+	globalMu.Unlock()
+
+	globalRWMu.Lock()
+	otherStruct.guardedField2 = 1
+	globalRWMu.Unlock()
+
+	globalRWMu.RLock()
+	_ = otherStruct.guardedField2
+	globalRWMu.RUnlock()
+
+	globalStruct.mu.Lock()
+	globalStruct.guardedField = 1
+	otherStruct.guardedField3 = 1
+	globalStruct.mu.Unlock()
+}
+
+// +checklocks:globalStruct.mu
+func testGlobalValidPreconditions0() {
+	globalStruct.guardedField = 1
+}
+
+// +checklocks:globalMu
+func testGlobalValidPreconditions1() {
+	otherStruct.guardedField1 = 1
+}
+
+// +checklocks:globalRWMu
+func testGlobalValidPreconditions2() {
+	otherStruct.guardedField2 = 1
+}
+
+// +checklocks:globalStruct.mu
+func testGlobalValidPreconditions3() {
+	otherStruct.guardedField3 = 1
+}
+
+func testGlobalInvalid() {
+	globalStruct.guardedField = 1 // +checklocksfail
+	otherStruct.guardedField1 = 1 // +checklocksfail
+	otherStruct.guardedField2 = 1 // +checklocksfail
+	otherStruct.guardedField3 = 1 // +checklocksfail
+}