66 lines
1.7 KiB
C++
66 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// UNSUPPORTED: no-threads
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// UNSUPPORTED: c++03
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// There's currently no release of OS X whose dylib contains the patch for
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// PR38682. Since the fix for future<void> is in the dylib, this test may fail.
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// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
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// This test is designed to cause and allow TSAN to detect a race condition
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// in std::async, as reported in https://llvm.org/PR38682.
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#include <cassert>
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#include <functional>
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#include <future>
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#include <numeric>
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#include <vector>
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#include "test_macros.h"
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static int worker(std::vector<int> const& data) {
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return std::accumulate(data.begin(), data.end(), 0);
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}
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static int& worker_ref(int& i) { return i; }
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static void worker_void() { }
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int main(int, char**) {
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// future<T>
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{
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std::vector<int> const v{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
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for (int i = 0; i != 20; ++i) {
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std::future<int> fut = std::async(std::launch::async, worker, v);
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int answer = fut.get();
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assert(answer == 55);
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}
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}
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// future<T&>
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{
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for (int i = 0; i != 20; ++i) {
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std::future<int&> fut = std::async(std::launch::async, worker_ref, std::ref(i));
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int& answer = fut.get();
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assert(answer == i);
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}
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}
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// future<void>
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{
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for (int i = 0; i != 20; ++i) {
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std::future<void> fut = std::async(std::launch::async, worker_void);
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fut.get();
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}
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}
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return 0;
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}
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