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
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
// UNSUPPORTED: c++03, c++11, c++14
// <mutex>
// template <class ...Mutex> class scoped_lock;
// explicit scoped_lock(mutex_type& m);
#include <mutex>
#include <cassert>
#include "test_macros.h"
struct TestMutex {
bool locked = false;
TestMutex() = default;
~TestMutex() { assert(!locked); }
void lock() { assert(!locked); locked = true; }
bool try_lock() { if (locked) return false; locked = true; return true; }
void unlock() { assert(locked); locked = false; }
TestMutex(TestMutex const&) = delete;
TestMutex& operator=(TestMutex const&) = delete;
};
#if !defined(TEST_HAS_NO_EXCEPTIONS)
struct TestMutexThrows {
bool locked = false;
bool throws_on_lock = false;
TestMutexThrows() = default;
~TestMutexThrows() { assert(!locked); }
void lock() {
assert(!locked);
if (throws_on_lock) {
throw 42;
}
locked = true;
}
bool try_lock() {
if (locked) return false;
lock();
return true;
}
void unlock() { assert(locked); locked = false; }
TestMutexThrows(TestMutexThrows const&) = delete;
TestMutexThrows& operator=(TestMutexThrows const&) = delete;
};
#endif // !defined(TEST_HAS_NO_EXCEPTIONS)
int main(int, char**)
{
{
using LG = std::scoped_lock<>;
LG lg;
}
{
using LG = std::scoped_lock<TestMutex>;
TestMutex m1;
{
LG lg(m1);
assert(m1.locked);
}
assert(!m1.locked);
}
{
using LG = std::scoped_lock<TestMutex, TestMutex>;
TestMutex m1, m2;
{
LG lg(m1, m2);
assert(m1.locked && m2.locked);
}
assert(!m1.locked && !m2.locked);
}
{
using LG = std::scoped_lock<TestMutex, TestMutex, TestMutex>;
TestMutex m1, m2, m3;
{
LG lg(m1, m2, m3);
assert(m1.locked && m2.locked && m3.locked);
}
assert(!m1.locked && !m2.locked && !m3.locked);
}
#if !defined(TEST_HAS_NO_EXCEPTIONS)
{
using MT = TestMutexThrows;
using LG = std::scoped_lock<MT>;
MT m1;
m1.throws_on_lock = true;
try {
LG lg(m1);
assert(false);
} catch (int) {}
assert(!m1.locked);
}
{
using MT = TestMutexThrows;
using LG = std::scoped_lock<MT, MT>;
MT m1, m2;
m1.throws_on_lock = true;
try {
LG lg(m1, m2);
assert(false);
} catch (int) {}
assert(!m1.locked && !m2.locked);
}
{
using MT = TestMutexThrows;
using LG = std::scoped_lock<MT, MT, MT>;
MT m1, m2, m3;
m2.throws_on_lock = true;
try {
LG lg(m1, m2, m3);
assert(false);
} catch (int) {}
assert(!m1.locked && !m2.locked && !m3.locked);
}
#endif
#ifdef __cpp_deduction_guides
{
TestMutex m1, m2, m3;
{
std::scoped_lock sl{};
static_assert((std::is_same<decltype(sl), std::scoped_lock<>>::value), "" );
}
{
std::scoped_lock sl{m1};
static_assert((std::is_same<decltype(sl), std::scoped_lock<decltype(m1)>>::value), "" );
}
{
std::scoped_lock sl{m1, m2};
static_assert((std::is_same<decltype(sl), std::scoped_lock<decltype(m1), decltype(m2)>>::value), "" );
}
{
std::scoped_lock sl{m1, m2, m3};
static_assert((std::is_same<decltype(sl), std::scoped_lock<decltype(m1), decltype(m2), decltype(m3)>>::value), "" );
}
}
#endif
return 0;
}
|
