[futures.task] and [futures.async]. Requires variadics and rvalue-ref support.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@112500 91177308-0d34-0410-b5e6-96231b3b80d8

test/thread/futures/futures.async/async.pass.cpp

@@ -0,0 +1,177 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <future>
+
+// template <class F, class... Args>
+//     future<typename result_of<F(Args...)>::type>
+//     async(F&& f, Args&&... args);
+
+// template <class F, class... Args>
+//     future<typename result_of<F(Args...)>::type>
+//     async(launch policy, F&& f, Args&&... args);
+
+#include <future>
+#include <memory>
+#include <cassert>
+
+typedef std::chrono::high_resolution_clock Clock;
+typedef std::chrono::milliseconds ms;
+
+int f0()
+{
+    std::this_thread::sleep_for(ms(200));
+    return 3;
+}
+
+int i = 0;
+
+int& f1()
+{
+    std::this_thread::sleep_for(ms(200));
+    return i;
+}
+
+void f2()
+{
+    std::this_thread::sleep_for(ms(200));
+}
+
+std::unique_ptr<int> f3(int i)
+{
+    std::this_thread::sleep_for(ms(200));
+    return std::unique_ptr<int>(new int(i));
+}
+
+std::unique_ptr<int> f4(std::unique_ptr<int>&& p)
+{
+    std::this_thread::sleep_for(ms(200));
+    return std::move(p);
+}
+
+int main()
+{
+    {
+        std::future<int> f = std::async(f0);
+        std::this_thread::sleep_for(ms(300));
+        Clock::time_point t0 = Clock::now();
+        assert(f.get() == 3);
+        Clock::time_point t1 = Clock::now();
+        assert(t1-t0 < ms(100));
+    }
+    {
+        std::future<int> f = std::async(std::launch::async, f0);
+        std::this_thread::sleep_for(ms(300));
+        Clock::time_point t0 = Clock::now();
+        assert(f.get() == 3);
+        Clock::time_point t1 = Clock::now();
+        assert(t1-t0 < ms(100));
+    }
+    {
+        std::future<int> f = std::async(std::launch::any, f0);
+        std::this_thread::sleep_for(ms(300));
+        Clock::time_point t0 = Clock::now();
+        assert(f.get() == 3);
+        Clock::time_point t1 = Clock::now();
+        assert(t1-t0 < ms(100));
+    }
+    {
+        std::future<int> f = std::async(std::launch::sync, f0);
+        std::this_thread::sleep_for(ms(300));
+        Clock::time_point t0 = Clock::now();
+        assert(f.get() == 3);
+        Clock::time_point t1 = Clock::now();
+        assert(t1-t0 > ms(100));
+    }
+
+    {
+        std::future<int&> f = std::async(f1);
+        std::this_thread::sleep_for(ms(300));
+        Clock::time_point t0 = Clock::now();
+        assert(&f.get() == &i);
+        Clock::time_point t1 = Clock::now();
+        assert(t1-t0 < ms(100));
+    }
+    {
+        std::future<int&> f = std::async(std::launch::async, f1);
+        std::this_thread::sleep_for(ms(300));
+        Clock::time_point t0 = Clock::now();
+        assert(&f.get() == &i);
+        Clock::time_point t1 = Clock::now();
+        assert(t1-t0 < ms(100));
+    }
+    {
+        std::future<int&> f = std::async(std::launch::any, f1);
+        std::this_thread::sleep_for(ms(300));
+        Clock::time_point t0 = Clock::now();
+        assert(&f.get() == &i);
+        Clock::time_point t1 = Clock::now();
+        assert(t1-t0 < ms(100));
+    }
+    {
+        std::future<int&> f = std::async(std::launch::sync, f1);
+        std::this_thread::sleep_for(ms(300));
+        Clock::time_point t0 = Clock::now();
+        assert(&f.get() == &i);
+        Clock::time_point t1 = Clock::now();
+        assert(t1-t0 > ms(100));
+    }
+
+    {
+        std::future<void> f = std::async(f2);
+        std::this_thread::sleep_for(ms(300));
+        Clock::time_point t0 = Clock::now();
+        f.get();
+        Clock::time_point t1 = Clock::now();
+        assert(t1-t0 < ms(100));
+    }
+    {
+        std::future<void> f = std::async(std::launch::async, f2);
+        std::this_thread::sleep_for(ms(300));
+        Clock::time_point t0 = Clock::now();
+        f.get();
+        Clock::time_point t1 = Clock::now();
+        assert(t1-t0 < ms(100));
+    }
+    {
+        std::future<void> f = std::async(std::launch::any, f2);
+        std::this_thread::sleep_for(ms(300));
+        Clock::time_point t0 = Clock::now();
+        f.get();
+        Clock::time_point t1 = Clock::now();
+        assert(t1-t0 < ms(100));
+    }
+    {
+        std::future<void> f = std::async(std::launch::sync, f2);
+        std::this_thread::sleep_for(ms(300));
+        Clock::time_point t0 = Clock::now();
+        f.get();
+        Clock::time_point t1 = Clock::now();
+        assert(t1-t0 > ms(100));
+    }
+
+    {
+        std::future<std::unique_ptr<int>> f = std::async(f3, 3);
+        std::this_thread::sleep_for(ms(300));
+        Clock::time_point t0 = Clock::now();
+        assert(*f.get() == 3);
+        Clock::time_point t1 = Clock::now();
+        assert(t1-t0 < ms(100));
+    }
+
+    {
+        std::future<std::unique_ptr<int>> f =
+                               std::async(f4, std::unique_ptr<int>(new int(3)));
+        std::this_thread::sleep_for(ms(300));
+        Clock::time_point t0 = Clock::now();
+        assert(*f.get() == 3);
+        Clock::time_point t1 = Clock::now();
+        assert(t1-t0 < ms(100));
+    }
+}