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git-subtree-dir: src/ipc/libmultiprocess git-subtree-split: 35944ffd23fa26652b82210351d50e896ce16c8f
72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
// Copyright (c) 2021 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <filesystem>
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#include <fstream>
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#include <future>
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#include <init.capnp.h>
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#include <init.capnp.proxy.h>
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#include <iostream>
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#include <mp/proxy-io.h>
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#include <mp/util.h>
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#include <stdexcept>
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#include <string>
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#include <thread>
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#include <tuple>
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#include <vector>
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namespace fs = std::filesystem;
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static auto Spawn(mp::EventLoop& loop, const std::string& process_argv0, const std::string& new_exe_name)
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{
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int pid;
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const int fd = mp::SpawnProcess(pid, [&](int fd) -> std::vector<std::string> {
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fs::path path = process_argv0;
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path.remove_filename();
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path.append(new_exe_name);
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return {path.string(), std::to_string(fd)};
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});
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return std::make_tuple(mp::ConnectStream<InitInterface>(loop, fd), pid);
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}
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static void LogPrint(bool raise, const std::string& message)
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{
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if (raise) throw std::runtime_error(message);
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std::ofstream("debug.log", std::ios_base::app) << message << std::endl;
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}
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int main(int argc, char** argv)
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{
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if (argc != 1) {
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std::cout << "Usage: mpexample\n";
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return 1;
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}
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std::promise<mp::EventLoop*> promise;
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std::thread loop_thread([&] {
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mp::EventLoop loop("mpexample", LogPrint);
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promise.set_value(&loop);
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loop.loop();
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});
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mp::EventLoop* loop = promise.get_future().get();
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auto [printer_init, printer_pid] = Spawn(*loop, argv[0], "mpprinter");
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auto [calc_init, calc_pid] = Spawn(*loop, argv[0], "mpcalculator");
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auto calc = calc_init->makeCalculator(printer_init->makePrinter());
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while (true) {
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std::string eqn;
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std::cout << "Enter the equation, or \"exit\" to quit: ";
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std::getline(std::cin, eqn);
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if (eqn == "exit") break;
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calc->solveEquation(eqn);
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}
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calc.reset();
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calc_init.reset();
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mp::WaitProcess(calc_pid);
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printer_init.reset();
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mp::WaitProcess(printer_pid);
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loop_thread.join();
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std::cout << "Bye!" << std::endl;
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return 0;
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}
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