1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
// Copyright 2018 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 semaphore
import (
"testing"
"gvisor.googlesource.com/gvisor/pkg/abi/linux"
"gvisor.googlesource.com/gvisor/pkg/sentry/context"
"gvisor.googlesource.com/gvisor/pkg/sentry/context/contexttest"
"gvisor.googlesource.com/gvisor/pkg/sentry/kernel/auth"
"gvisor.googlesource.com/gvisor/pkg/syserror"
)
func executeOps(ctx context.Context, t *testing.T, set *Set, ops []linux.Sembuf, block bool) chan struct{} {
ch, _, err := set.executeOps(ctx, ops, 123)
if err != nil {
t.Fatalf("ExecuteOps(ops) failed, err: %v, ops: %+v", err, ops)
}
if block {
if ch == nil {
t.Fatalf("ExecuteOps(ops) got: nil, expected: !nil, ops: %+v", ops)
}
if signalled(ch) {
t.Fatalf("ExecuteOps(ops) channel should not have been signalled, ops: %+v", ops)
}
} else {
if ch != nil {
t.Fatalf("ExecuteOps(ops) got: %v, expected: nil, ops: %+v", ch, ops)
}
}
return ch
}
func signalled(ch chan struct{}) bool {
select {
case <-ch:
return true
default:
return false
}
}
func TestBasic(t *testing.T) {
ctx := contexttest.Context(t)
set := &Set{ID: 123, sems: make([]sem, 1)}
ops := []linux.Sembuf{
{SemOp: 1},
}
executeOps(ctx, t, set, ops, false)
ops[0].SemOp = -1
executeOps(ctx, t, set, ops, false)
ops[0].SemOp = -1
ch1 := executeOps(ctx, t, set, ops, true)
ops[0].SemOp = 1
executeOps(ctx, t, set, ops, false)
if !signalled(ch1) {
t.Fatalf("ExecuteOps(ops) channel should not have been signalled, ops: %+v", ops)
}
}
func TestWaitForZero(t *testing.T) {
ctx := contexttest.Context(t)
set := &Set{ID: 123, sems: make([]sem, 1)}
ops := []linux.Sembuf{
{SemOp: 0},
}
executeOps(ctx, t, set, ops, false)
ops[0].SemOp = -2
ch1 := executeOps(ctx, t, set, ops, true)
ops[0].SemOp = 0
executeOps(ctx, t, set, ops, false)
ops[0].SemOp = 1
executeOps(ctx, t, set, ops, false)
ops[0].SemOp = 0
chZero1 := executeOps(ctx, t, set, ops, true)
ops[0].SemOp = 0
chZero2 := executeOps(ctx, t, set, ops, true)
ops[0].SemOp = 1
executeOps(ctx, t, set, ops, false)
if !signalled(ch1) {
t.Fatalf("ExecuteOps(ops) channel should have been signalled, ops: %+v, set: %+v", ops, set)
}
ops[0].SemOp = -2
executeOps(ctx, t, set, ops, false)
if !signalled(chZero1) {
t.Fatalf("ExecuteOps(ops) channel zero 1 should have been signalled, ops: %+v, set: %+v", ops, set)
}
if !signalled(chZero2) {
t.Fatalf("ExecuteOps(ops) channel zero 2 should have been signalled, ops: %+v, set: %+v", ops, set)
}
}
func TestNoWait(t *testing.T) {
ctx := contexttest.Context(t)
set := &Set{ID: 123, sems: make([]sem, 1)}
ops := []linux.Sembuf{
{SemOp: 1},
}
executeOps(ctx, t, set, ops, false)
ops[0].SemOp = -2
ops[0].SemFlg = linux.IPC_NOWAIT
if _, _, err := set.executeOps(ctx, ops, 123); err != syserror.ErrWouldBlock {
t.Fatalf("ExecuteOps(ops) wrong result, got: %v, expected: %v", err, syserror.ErrWouldBlock)
}
ops[0].SemOp = 0
ops[0].SemFlg = linux.IPC_NOWAIT
if _, _, err := set.executeOps(ctx, ops, 123); err != syserror.ErrWouldBlock {
t.Fatalf("ExecuteOps(ops) wrong result, got: %v, expected: %v", err, syserror.ErrWouldBlock)
}
}
func TestUnregister(t *testing.T) {
ctx := contexttest.Context(t)
r := NewRegistry(auth.NewRootUserNamespace())
set, err := r.FindOrCreate(ctx, 123, 2, linux.FileMode(0x600), true, true, true)
if err != nil {
t.Fatalf("FindOrCreate() failed, err: %v", err)
}
if got := r.FindByID(set.ID); got.ID != set.ID {
t.Fatalf("FindById(%d) failed, got: %+v, expected: %+v", set.ID, got, set)
}
ops := []linux.Sembuf{
{SemOp: -1},
}
chs := make([]chan struct{}, 0, 5)
for i := 0; i < 5; i++ {
ch := executeOps(ctx, t, set, ops, true)
chs = append(chs, ch)
}
creds := auth.CredentialsFromContext(ctx)
if err := r.RemoveID(set.ID, creds); err != nil {
t.Fatalf("RemoveID(%d) failed, err: %v", set.ID, err)
}
if !set.dead {
t.Fatalf("set is not dead: %+v", set)
}
if got := r.FindByID(set.ID); got != nil {
t.Fatalf("FindById(%d) failed, got: %+v, expected: nil", set.ID, got)
}
for i, ch := range chs {
if !signalled(ch) {
t.Fatalf("channel %d should have been signalled", i)
}
}
}
|
