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Diffstat (limited to '')
-rw-r--r-- | src/seastar/demos/coroutines_demo.cc | 63 |
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 |