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// 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 (
"math/rand"
)
func testInconsistentReturn(tc *oneGuardStruct) { // +checklocksfail
if x := rand.Intn(10); x%2 == 1 {
tc.mu.Lock()
}
}
func testConsistentBranching(tc *oneGuardStruct) {
x := rand.Intn(10)
if x%2 == 1 {
tc.mu.Lock()
} else {
tc.mu.Lock()
}
tc.guardedField = 1
if x%2 == 1 {
tc.mu.Unlock()
} else {
tc.mu.Unlock()
}
}
func testInconsistentBranching(tc *oneGuardStruct) { // +checklocksfail:2
// We traverse the control flow graph in all consistent ways. We cannot
// determine however, that the first if block and second if block will
// evaluate to the same condition. Therefore, there are two consistent
// paths through this code, and two inconsistent paths. Either way, the
// guardedField should be also marked as an invalid access.
x := rand.Intn(10)
if x%2 == 1 {
tc.mu.Lock()
}
tc.guardedField = 1 // +checklocksfail
if x%2 == 1 {
tc.mu.Unlock() // +checklocksforce
}
}
func testUnboundedLocks(tc []*oneGuardStruct) {
for _, l := range tc {
l.mu.Lock()
}
// This test should have the above *not fail*, though the exact
// lock state cannot be tracked through the below. Therefore, we
// expect the next loop to actually fail, and we force the unlock
// loop to succeed in exactly the same way.
for _, l := range tc {
l.guardedField = 1 // +checklocksfail
}
for _, l := range tc {
l.mu.Unlock() // +checklocksforce
}
}
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