libstdc++-v3/testsuite/30_threads/condition_variable_any/53830.cc

   1 // { dg-do run }
   2 // { dg-additional-options "-pthread" { target pthread } }
   3 // { dg-require-effective-target c++11 }
   4 // { dg-require-gthreads "" }
   5 // { dg-require-sched-yield "" }
   6 // { dg-require-sleep "" }
   7
   8 // Copyright (C) 2012-2024 Free Software Foundation, Inc.
   9 //
  10 // This file is part of the GNU ISO C++ Library.  This library is free
  11 // software; you can redistribute it and/or modify it under the
  12 // terms of the GNU General Public License as published by the
  13 // Free Software Foundation; either version 3, or (at your option)
  14 // any later version.
  15
  16 // This library is distributed in the hope that it will be useful,
  17 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 // GNU General Public License for more details.
  20
  21 // You should have received a copy of the GNU General Public License along
  22 // with this library; see the file COPYING3.  If not see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 // PR libstdc++/53830
  26 // Test for deadlock in condition_variable_any::wait_for
  27
  28 #include <thread>
  29 #include <mutex>
  30 #include <condition_variable>
  31 #include <chrono>
  32 #include <atomic>
  33
  34 std::mutex mutex;
  35 std::condition_variable_any cv;
  36
  37 std::atomic<int> barrier(0);
  38
  39 // waits for data from another thread
  40 void wait_for_data()
  41 {
  42   std::unique_lock<std::mutex> lock(mutex);
  43   barrier = 1;
  44   cv.wait_for(lock, std::chrono::milliseconds(100), []{ return false; });
  45   // read data
  46 }
  47
  48 // passes data to waiting thread
  49 void provide_data()
  50 {
  51   while (barrier == 0)
  52     std::this_thread::yield();
  53   std::unique_lock<std::mutex> lock(mutex);
  54   // pass data
  55   std::this_thread::sleep_for(std::chrono::seconds(1));
  56   cv.notify_one();
  57 }
  58
  59 int main()
  60 {
  61   std::thread thread1(wait_for_data);
  62   provide_data();
  63   thread1.join();
  64   return 0;
  65 }
  66