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
|
//
// 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: c++03, c++11, c++14, c++17
// UNSUPPORTED: no-threads
// XFAIL: availability-synchronization_library-missing
// XFAIL: !has-64-bit-atomics
// XFAIL: !has-1024-bit-atomics
// void notify_all() const noexcept;
#include <atomic>
#include <cassert>
#include <thread>
#include <type_traits>
#include <vector>
#include "atomic_helpers.h"
#include "make_test_thread.h"
#include "test_macros.h"
template <typename T>
struct TestNotifyAll {
void operator()() const {
T x(T(1));
std::atomic_ref<T> const a(x);
bool done = false;
std::atomic<int> started_num = 0;
std::atomic<int> wait_done_num = 0;
constexpr auto number_of_threads = 8;
std::vector<std::thread> threads;
threads.reserve(number_of_threads);
for (auto j = 0; j < number_of_threads; ++j) {
threads.push_back(support::make_test_thread([&a, &started_num, &done, &wait_done_num] {
started_num.fetch_add(1, std::memory_order::relaxed);
a.wait(T(1));
wait_done_num.fetch_add(1, std::memory_order::relaxed);
// likely to fail if wait did not block
assert(done);
}));
}
while (started_num.load(std::memory_order::relaxed) != number_of_threads) {
std::this_thread::yield();
}
std::this_thread::sleep_for(std::chrono::milliseconds(1));
done = true;
a.store(T(3));
a.notify_all();
// notify_all should unblock all the threads so that the loop below won't stuck
while (wait_done_num.load(std::memory_order::relaxed) != number_of_threads) {
std::this_thread::yield();
}
for (auto& thread : threads) {
thread.join();
}
ASSERT_NOEXCEPT(a.notify_all());
}
};
int main(int, char**) {
TestEachAtomicType<TestNotifyAll>()();
return 0;
}
|
