1// { dg-do run { target *-*-freebsd* *-*-dragonfly* *-*-netbsd* *-*-linux* *-*-gnu* *-*-solaris* *-*-cygwin *-*-darwin* powerpc-ibm-aix* } } 2// { dg-options " -std=gnu++11 -pthread" { target *-*-freebsd* *-*-dragonfly* *-*-netbsd* *-*-linux* *-*-gnu* powerpc-ibm-aix* } } 3// { dg-options " -std=gnu++11 -pthreads" { target *-*-solaris* } } 4// { dg-options " -std=gnu++11 " { target *-*-cygwin *-*-darwin* } } 5// { dg-require-cstdint "" } 6// { dg-require-gthreads "" } 7// { dg-require-sched-yield "" } 8 9// Copyright (C) 2011-2015 Free Software Foundation, Inc. 10// 11// This file is part of the GNU ISO C++ Library. This library is free 12// software; you can redistribute it and/or modify it under the 13// terms of the GNU General Public License as published by the 14// Free Software Foundation; either version 3, or (at your option) 15// any later version. 16 17// This library is distributed in the hope that it will be useful, 18// but WITHOUT ANY WARRANTY; without even the implied warranty of 19// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20// GNU General Public License for more details. 21 22// You should have received a copy of the GNU General Public License along 23// with this library; see the file COPYING3. If not see 24// <http://www.gnu.org/licenses/>. 25 26#include <condition_variable> 27#include <thread> 28#include <mutex> 29#include <array> 30#include <sstream> 31 32struct scoped_thread 33{ 34 ~scoped_thread() { if (t.joinable()) t.join(); } 35 std::thread t; 36}; 37 38int main() 39{ 40 typedef std::unique_lock<std::mutex> Lock; 41 42 std::mutex m; 43 std::condition_variable_any cond; 44 unsigned int product = 0; 45 const unsigned int count = 10; 46 47 // writing to stream causes timing changes which makes deadlock easier 48 // to reproduce - do not remove 49 std::ostringstream out; 50 51 // create consumers 52 std::array<scoped_thread, 2> threads; 53 for (std::size_t i = 0; i < threads.size(); ++i) 54 threads[i].t 55 = std::thread( [&] 56 { 57 for (unsigned int i = 0; i < count; ++i) 58 { 59 std::this_thread::yield(); 60 Lock lock(m); 61 while(product == 0) 62 cond.wait(lock); 63 out << "got product " 64 << std::this_thread::get_id() 65 << ' ' << product << std::endl; 66 --product; 67 } 68 } ); 69 70 // single producer 71 for (std::size_t i = 0; i < threads.size() * count; ++i) 72 { 73 std::this_thread::yield(); 74 Lock lock(m); 75 ++product; 76 out << "setting product " << std::this_thread::get_id() 77 << ' ' << product << std::endl; 78 cond.notify_one(); 79 } 80} 81