1 //===-------------- thread_local_destruction_order.pass.cpp ---------------===//
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: c++03
10 // UNSUPPORTED: libcxxabi-no-threads
11 
12 #include <cassert>
13 #include <thread>
14 
15 int seq = 0;
16 
17 class OrderChecker {
18 public:
19   explicit OrderChecker(int n) : n_{n} { }
20 
21   ~OrderChecker() {
22     assert(seq++ == n_);
23   }
24 
25 private:
26   int n_;
27 };
28 
29 template <int ID>
30 class CreatesThreadLocalInDestructor {
31 public:
32   ~CreatesThreadLocalInDestructor() {
33     thread_local OrderChecker checker{ID};
34   }
35 };
36 
37 OrderChecker global{7};
38 
39 void thread_fn() {
40   static OrderChecker fn_static{5};
41   thread_local CreatesThreadLocalInDestructor<2> creates_tl2;
42   thread_local OrderChecker fn_thread_local{1};
43   thread_local CreatesThreadLocalInDestructor<0> creates_tl0;
44 }
45 
46 int main(int, char**) {
47   static OrderChecker fn_static{6};
48 
49   std::thread{thread_fn}.join();
50   assert(seq == 3);
51 
52   thread_local OrderChecker fn_thread_local{4};
53   thread_local CreatesThreadLocalInDestructor<3> creates_tl;
54 
55   return 0;
56 }
57