threading?

CMakeLists.txt

@@ -6,7 +6,7 @@ include(CMakePrintHelpers)
 set(CMAKE_C_COMPILER clang)
 set(CMAKE_CXX_COMPILER clang++)
 
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS true)

inc/graph/plugins/plugin.h

@@ -11,13 +11,13 @@ typedef struct {
   double x, y;
 } point_t;
 
-typedef bool (*start_t)();
+typedef int (*run_method_t)();
 typedef void (*destroy_t)();
 typedef void (*update_callback_t)(unsigned int chartIndex, const char* seriesName, const point_t* points, int count);
 
 typedef struct {
   uint32_t version;
-  start_t init_method;
+  run_method_t run_method;
   destroy_t destroy_method;
   update_callback_t update_callback;
 } plugin_t;

inc/graph/server/plugin.h

@@ -1,24 +1,31 @@
 #pragma once
 
 #include <graph/plugins/plugin.h>
+#include <QThread>
 #include <QAbstractListModel>
 #include <string>
 
 namespace Graph {
 
-class Plugin {
+class Plugin : public QObject {
+  Q_OBJECT
+
  private:
   plugin_t* plugin;
   const std::string path;
   const void* handle;
 
+ public slots:
+  void run();
+
+ signals:
+  void exited(int code);
+
  public:
-  Plugin(const std::string& path);
+  Plugin(const std::string& path, update_callback_t callback);
   ~Plugin();
 
-  bool init(update_callback_t callback);
-
-  const std::string& get_path() const { return this->path; }
+  const std::string& getPath() const { return this->path; }
 };
 
 class PluginModel : public QAbstractListModel {

src/graph/plugins/http/http.cpp

@@ -8,9 +8,7 @@
 
 extern "C" {
 
-plugin_t plugin = {.version = 1, .init_method = &init, .destroy_method = &destroy};
-
-bool init() {
+int run() {
   std::cout << "init" << std::endl;
   point_t points[100];
   for (int i = 0; i < 100; i++) {
@@ -19,10 +17,12 @@ bool init() {
   }
 
   plugin.update_callback(0, "1st", points, 100);
-  return true;
+  return 0;
 }
 
 void destroy() {
   std::cout << "destory" << std::endl;
 }
+
+plugin_t plugin = {.version = 1, .run_method = &run, .destroy_method = &destroy};
 }

src/graph/server/gui/mainwindow.cpp

@@ -4,7 +4,8 @@
 #include <graph/server/plugin.h>
 #include <graph/server/spec.h>
 #include <graph/server/ui_mainwindow.h>
-#include <qfiledialog.h>
+#include <qobject.h>
+#include <qthread.h>
 #include <QFileDialog>
 #include <QMessageBox>
 #include <iostream>
@@ -126,9 +127,16 @@ void MainWindow::on_action_Load_triggered() {
 
   for (QString file : fileDialog->selectedFiles()) {
     try {
-      Plugin* plugin = new Plugin(file.toStdString());
-      plugin->init(&Graph::GUI::addData);
+      Plugin* plugin = new Plugin(file.toStdString(), &Graph::GUI::addData);
       pluginModel->add(plugin);
+
+      QThread* thread = new QThread();
+      plugin->moveToThread(thread);
+      connect(plugin, &Plugin::exited, this, [](int code) { std::cout << "plugin exited: " << code << std::endl; });
+      connect(thread, &QThread::started, plugin, &Plugin::run);
+      connect(plugin, &Plugin::exited, thread, &QThread::quit);
+      connect(thread, &QThread::finished, thread, &QThread::deleteLater);
+      thread->start();
     } catch (std::runtime_error e) {
       std::cout << e.what() << std::endl;
       QMessageBox::critical(this, "Error", "Failed to load plugin:\n" + file, QMessageBox::StandardButton::Ignore);

src/graph/server/plugin.cpp

@@ -1,42 +1,43 @@
 #include <dlfcn.h>
 #include <graph/server/plugin.h>
+#include <qthread.h>
+#include <iostream>
 #include <stdexcept>
 #include <string>
 
 namespace Graph {
-Plugin::Plugin(const std::string& path) : path(path) {
-  this->handle = dlopen(path.c_str(), RTLD_LAZY);
-  if (!this->handle)
+Plugin::Plugin(const std::string& path, update_callback_t callback) : path(path) {
+  handle = dlopen(path.c_str(), RTLD_LAZY);
+  if (!handle)
     throw std::runtime_error(dlerror());
 
-  this->plugin = (plugin_t*)dlsym((void*)this->handle, "plugin");
-  if (!this->plugin)
+  plugin = (plugin_t*)dlsym((void*)this->handle, "plugin");
+  if (!plugin)
     throw std::runtime_error(dlerror());
 
-  this->plugin->update_callback = nullptr;
+  plugin->update_callback = callback;
+}
+
+void Plugin::run() {
+  emit exited(plugin->run_method());
 }
 
 Plugin::~Plugin() {
-  if (this->plugin->destroy_method)
-    this->plugin->destroy_method();
+  if (plugin->destroy_method)
+    plugin->destroy_method();
 
   if (handle)
-    dlclose((void*)this->handle);
-}
-
-bool Plugin::init(update_callback_t callback) {
-  this->plugin->update_callback = callback;
-  return this->plugin->init_method();
+    dlclose((void*)handle);
 }
 
 PluginModel::~PluginModel() {
-  for (Plugin* plugin : this->plugins) {
+  for (Plugin* plugin : plugins) {
     delete plugin;
   }
 }
 
 int PluginModel::rowCount(const QModelIndex& parent) const {
-  return this->plugins.size();
+  return plugins.size();
 }
 
 QVariant PluginModel::data(const QModelIndex& index, int role) const {
@@ -44,7 +45,7 @@ QVariant PluginModel::data(const QModelIndex& index, int role) const {
     return QVariant();
 
   if (role == Qt::DisplayRole) {
-    return QString(plugins[index.row()]->get_path().c_str());
+    return QString(plugins[index.row()]->getPath().c_str());
   }
 
   return QVariant();