Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 63 insertions, 0 deletions

diff --git a/src/seastar/demos/coroutines_demo.cc b/src/seastar/demos/coroutines_demo.cc
new file mode 100644
index 000000000..58c881c93
--- /dev/null
+++ b/src/seastar/demos/coroutines_demo.cc
@@ -0,0 +1,63 @@
+/*
+ * This file is open source software, licensed to you under the terms
+ * of the Apache License, Version 2.0 (the "License").  See the NOTICE file
+ * distributed with this work for additional information regarding copyright
+ * ownership.  You may not use this file except in compliance with the License.
+ *
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+/*
+ * Copyright (C) 2019 ScyllaDB Ltd.
+ */
+
+#include <iostream>
+
+#include <seastar/util/std-compat.hh>
+
+#ifndef SEASTAR_COROUTINES_ENABLED
+
+int main(int argc, char** argv) {
+    std::cout << "coroutines not available\n";
+    return 0;
+}
+
+#else
+
+#include <seastar/core/app-template.hh>
+#include <seastar/core/coroutine.hh>
+#include <seastar/core/fstream.hh>
+#include <seastar/core/sleep.hh>
+#include <seastar/core/seastar.hh>
+#include <seastar/core/loop.hh>
+
+int main(int argc, char** argv) {
+    seastar::app_template app;
+    app.run(argc, argv, [] () -> seastar::future<> {
+        std::cout << "this is a completely useless program\nplease stand by...\n";
+        auto f = seastar::parallel_for_each(std::vector<int> { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }, [] (int i) -> seastar::future<> {
+            co_await seastar::sleep(std::chrono::seconds(i));
+            std::cout << i << "\n";
+        });
+
+        auto file = co_await seastar::open_file_dma("useless_file.txt", seastar::open_flags::create | seastar::open_flags::wo);
+        auto out = co_await seastar::make_file_output_stream(file);
+        seastar::sstring str = "nothing to see here, move along now\n";
+        co_await out.write(str);
+        co_await out.flush();
+        co_await out.close();
+
+        co_await std::move(f);
+        std::cout << "done\n";
+    });
+}
+
+#endif