1 files changed, 91 insertions, 0 deletions
diff --git a/tools/checklocks/test/atomics.go b/tools/checklocks/test/atomics.go
new file mode 100644
index 000000000..8e060d8a2
--- /dev/null
+++ b/tools/checklocks/test/atomics.go
@@ -0,0 +1,91 @@
+// 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"
+	"sync/atomic"
+)
+
+type atomicStruct struct {
+	accessedNormally int32
+
+	// +checkatomic
+	accessedAtomically int32
+
+	// +checklocksignore
+	ignored int32
+}
+
+func testNormalAccess(tc *atomicStruct, v chan int32, p chan *int32) {
+	v <- tc.accessedNormally
+	p <- &tc.accessedNormally
+}
+
+func testAtomicAccess(tc *atomicStruct, v chan int32) {
+	v <- atomic.LoadInt32(&tc.accessedAtomically)
+}
+
+func testAtomicAccessInvalid(tc *atomicStruct, v chan int32) {
+	v <- atomic.LoadInt32(&tc.accessedNormally) // +checklocksfail
+}
+
+func testNormalAccessInvalid(tc *atomicStruct, v chan int32, p chan *int32) {
+	v <- tc.accessedAtomically  // +checklocksfail
+	p <- &tc.accessedAtomically // +checklocksfail
+}
+
+func testIgnored(tc *atomicStruct, v chan int32, p chan *int32) {
+	v <- atomic.LoadInt32(&tc.ignored)
+	v <- tc.ignored
+	p <- &tc.ignored
+}
+
+type atomicMixedStruct struct {
+	mu sync.Mutex
+
+	// +checkatomic
+	// +checklocks:mu
+	accessedMixed int32
+}
+
+func testAtomicMixedValidRead(tc *atomicMixedStruct, v chan int32) {
+	v <- atomic.LoadInt32(&tc.accessedMixed)
+}
+
+func testAtomicMixedInvalidRead(tc *atomicMixedStruct, v chan int32, p chan *int32) {
+	v <- tc.accessedMixed  // +checklocksfail
+	p <- &tc.accessedMixed // +checklocksfail
+}
+
+func testAtomicMixedValidLockedWrite(tc *atomicMixedStruct, v chan int32, p chan *int32) {
+	tc.mu.Lock()
+	atomic.StoreInt32(&tc.accessedMixed, 1)
+	tc.mu.Unlock()
+}
+
+func testAtomicMixedInvalidLockedWrite(tc *atomicMixedStruct, v chan int32, p chan *int32) {
+	tc.mu.Lock()
+	tc.accessedMixed = 1 // +checklocksfail:2
+	tc.mu.Unlock()
+}
+
+func testAtomicMixedInvalidAtomicWrite(tc *atomicMixedStruct, v chan int32, p chan *int32) {
+	atomic.StoreInt32(&tc.accessedMixed, 1) // +checklocksfail
+}
+
+func testAtomicMixedInvalidWrite(tc *atomicMixedStruct, v chan int32, p chan *int32) {
+	tc.accessedMixed = 1 // +checklocksfail:2
+}