1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// UNSUPPORTED: no-threads
10
11// <thread>
12
13// class thread
14
15// void join();
16
17#include <thread>
18#include <new>
19#include <cstdlib>
20#include <cassert>
21#include <system_error>
22#include <atomic>
23
24#include "make_test_thread.h"
25#include "test_macros.h"
26
27std::atomic_bool done(false);
28
29class G
30{
31 int alive_;
32public:
33 static int n_alive;
34 static bool op_run;
35
36 G() : alive_(1) {++n_alive;}
37 G(const G& g) : alive_(g.alive_) {++n_alive;}
38 ~G() {alive_ = 0; --n_alive;}
39
40 void operator()()
41 {
42 assert(alive_ == 1);
43 assert(n_alive >= 1);
44 op_run = true;
45 }
46};
47
48int G::n_alive = 0;
49bool G::op_run = false;
50
51void foo() { done = true; }
52
53int main(int, char**)
54{
55 {
56 G g;
57 std::thread t0 = support::make_test_thread(g);
58 assert(t0.joinable());
59 t0.join();
60 assert(!t0.joinable());
61#ifndef TEST_HAS_NO_EXCEPTIONS
62 try {
63 t0.join();
64 assert(false);
65 } catch (std::system_error const&) {
66 }
67#endif
68 }
69#ifndef TEST_HAS_NO_EXCEPTIONS
70 {
71 std::thread t0 = support::make_test_thread(foo);
72 t0.detach();
73 try {
74 t0.join();
75 assert(false);
76 } catch (std::system_error const&) {
77 }
78 // Wait to make sure that the detached thread has started up.
79 // Without this, we could exit main and start destructing global
80 // resources that are needed when the thread starts up, while the
81 // detached thread would start up only later.
82 while (!done) {}
83 }
84#endif
85
86 return 0;
87}
88

source code of libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/join.pass.cpp