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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// UNSUPPORTED: no-localization
// UNSUPPORTED: no-threads
// UNSUPPORTED: libcpp-has-no-experimental-syncstream
// <syncstream>
// template <class charT, class traits, class Allocator>
// class basic_osyncstream;
// Basic test whether the code works in a threaded environment.
// Using timing the output order should be stable.
// several_threads.pass.cpp tests with more threads.
#include <syncstream>
#include <sstream>
#include <mutex>
#include <thread>
#include <cassert>
#include <iostream>
#include "test_macros.h"
static std::basic_ostringstream<char> ss;
static const char a = 'a';
static const char b = 'b';
static const char c = 'c';
static const char d = 'd';
void f1() {
std::basic_osyncstream<char> out(ss);
out << a;
std::this_thread::sleep_for(std::chrono::milliseconds(250));
out << b;
}
void f2() {
std::basic_osyncstream<char> out(ss);
out << c;
out << d;
}
int main(int, char**) {
std::thread t1(f1);
std::thread t2(f2);
t1.join();
t2.join();
assert(ss.str() == "cdab");
return 0;
}
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