libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/joinable.pass.cpp

   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 // bool joinable() const;
  16
  17 #include <thread>
  18 #include <new>
  19 #include <cstdlib>
  20 #include <cassert>
  21
  22 #include "make_test_thread.h"
  23 #include "test_macros.h"
  24
  25 class G
  26 {
  27     int alive_;
  28 public:
  29     static int n_alive;
  30     static bool op_run;
  31
  32     G() : alive_(1) {++n_alive;}
  33     G(const G& g) : alive_(g.alive_) {++n_alive;}
  34     ~G() {alive_ = 0; --n_alive;}
  35
  36     void operator()()
  37     {
  38         assert(alive_ == 1);
  39         assert(n_alive >= 1);
  40         op_run = true;
  41     }
  42 };
  43
  44 int G::n_alive = 0;
  45 bool G::op_run = false;
  46
  47 int main(int, char**)
  48 {
  49     {
  50         G g;
  51         std::thread t0 = support::make_test_thread(g);
  52         assert(t0.joinable());
  53         t0.join();
  54         assert(!t0.joinable());
  55     }
  56
  57   return 0;
  58 }