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: c++03, c++11, c++14, c++17 10 // UNSUPPORTED: no-localization 11 // UNSUPPORTED: no-threads 12 // UNSUPPORTED: libcpp-has-no-experimental-syncstream 13 14 // <syncstream> 15 16 // template <class charT, class traits, class Allocator> 17 // class basic_osyncstream; 18 19 // Basic test whether the code works in a threaded environment. 20 // Using timing the output order should be stable. 21 // several_threads.pass.cpp tests with more threads. 22 23 #include <syncstream> 24 #include <sstream> 25 #include <mutex> 26 #include <thread> 27 #include <cassert> 28 #include <iostream> 29 30 #include "test_macros.h" 31 32 static std::basic_ostringstream<char> ss; 33 static const char a = 'a'; 34 static const char b = 'b'; 35 static const char c = 'c'; 36 static const char d = 'd'; 37 f1()38void f1() { 39 std::basic_osyncstream<char> out(ss); 40 out << a; 41 std::this_thread::sleep_for(std::chrono::milliseconds(250)); 42 out << b; 43 } 44 f2()45void f2() { 46 std::basic_osyncstream<char> out(ss); 47 out << c; 48 out << d; 49 } 50 main(int,char **)51int main(int, char**) { 52 std::thread t1(f1); 53 std::thread t2(f2); 54 t1.join(); 55 t2.join(); 56 57 assert(ss.str() == "cdab"); 58 59 return 0; 60 } 61