69 lines
1.7 KiB
C++
69 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// UNSUPPORTED: libcpp-has-no-threads
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// UNSUPPORTED: c++98, c++03
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// <future>
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// template <class F, class... Args>
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// future<typename result_of<F(Args...)>::type>
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// async(F&& f, Args&&... args);
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// template <class F, class... Args>
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// future<typename result_of<F(Args...)>::type>
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// async(launch policy, F&& f, Args&&... args);
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// This test is designed to cause and allow TSAN to detect the race condition
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// reported in PR23293: https://bugs.llvm.org/show_bug.cgi?id=23293
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#include <future>
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#include <chrono>
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#include <thread>
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#include <memory>
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#include <cassert>
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int f_async() {
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typedef std::chrono::milliseconds ms;
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std::this_thread::sleep_for(ms(200));
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return 42;
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}
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bool ran = false;
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int f_deferred() {
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ran = true;
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return 42;
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}
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void test_each() {
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{
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std::future<int> f = std::async(f_async);
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int const result = f.get();
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assert(result == 42);
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}
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{
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std::future<int> f = std::async(std::launch::async, f_async);
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int const result = f.get();
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assert(result == 42);
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}
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{
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ran = false;
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std::future<int> f = std::async(std::launch::deferred, f_deferred);
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assert(ran == false);
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int const result = f.get();
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assert(ran == true);
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assert(result == 42);
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}
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}
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int main() {
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for (int i=0; i < 25; ++i) test_each();
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}
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