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#include <Wt/WServer.h>
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#include <Wt/WApplication.h>
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#include <Wt/WContainerWidget.h>
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#include <Wt/WText.h>
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#include <Wt/WVBoxLayout.h>
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#include <Wt/WCompositeWidget.h>
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#include <iostream>
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#include <memory>
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#include <thread>
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#include <random>
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#include <atomic>
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// CMD:
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// C:> wt-deadlock-test --http-address 0.0.0.0 --docroot C:\Users\Benutzter\source\repos\emweb\wt-4.3.1-build-debug-install\share\Wt
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// <Meta + R> http://localhost/
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class MyApp : public Wt::WApplication {
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private:
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Wt::WText* text{};
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std::atomic<int> count{};
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public:
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static std::unique_ptr<Wt::WApplication> CreateApp(const Wt::WEnvironment& env)
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{
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return std::make_unique<MyApp>(env);
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}
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MyApp (const Wt::WEnvironment& env)
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: Wt::WApplication(env)
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{
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auto layout = root()->setLayout(std::make_unique<Wt::WVBoxLayout>());
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text = layout->addWidget(std::make_unique<Wt::WText>("warming up..."));
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layout->addStretch(1);
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const auto sessionid = wApp->sessionId();
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const auto finishcb = bindSafe([&] () {
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if (--count == 0) {
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text->setText("done");
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}
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else {
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text->setText("loading: " + std::to_string(count));
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}
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wApp->triggerUpdate();
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wApp->enableUpdates(false);
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});
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constexpr int CONCURRENCY = 32;
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for (int i = 0; i < CONCURRENCY; ++i) {
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++count;
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wApp->enableUpdates(true);
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std::thread{[sessionid, finishcb] () {
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std::random_device rd;
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std::mt19937 gen(rd());
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std::uniform_int_distribution<> distrib(1, 6);
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std::this_thread::sleep_for(std::chrono::seconds(distrib(gen)));
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Wt::WServer::instance()->post(sessionid, finishcb);
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}}.detach();
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}
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}
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};
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int main(int argc, char** argv)
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try {
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Wt::WServer wserver{argc, argv};
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wserver.addEntryPoint(Wt::EntryPointType::Application, &MyApp::CreateApp);
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wserver.run();
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return wserver.waitForShutdown();
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}
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catch (std::exception& e) {
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std::cerr << e.what() << std::endl;
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return EXIT_FAILURE;
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}
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