Use a thread for dispatch events

src/wine-host/plugin-bridge.cpp

@@ -108,15 +108,19 @@ PluginBridge::PluginBridge(std::string plugin_dll_path,
     // We only needed this little hack during initialization
     current_bridge_isntance = nullptr;
     plugin->ptr1 = this;
+
+    // For our communication we use simple threads and blocking operations
+    // instead of asynchronous IO since communication has to be handled in
+    // lockstep anyway
+    dispatch_handler = std::thread([&]() {
+        while (true) {
+            passthrough_event(host_vst_dispatch, plugin, plugin->dispatcher);
+        }
+    });
 }
 
-// TODO: Replace blocking loop with async readers or threads for all of the
-//       sockets. Also extract this functionality somewhere since the host event
-//       callback needs to do exactly the same thing.
-void PluginBridge::dispatch_loop() {
-    while (true) {
-        passthrough_event(host_vst_dispatch, plugin, plugin->dispatcher);
-    }
+void PluginBridge::wait() {
+    dispatch_handler.join();
 }
 
 intptr_t PluginBridge::host_callback(AEffect* /*plugin*/,

src/wine-host/plugin-bridge.h

@@ -24,6 +24,8 @@
 #include <vestige/aeffect.h>
 #include <windows.h>
 
+#include <thread>
+
 /**
  * This handles the communication between the Linux native VST plugin and the
  * Wine VST host. The functions below should be used as callback functions in an
@@ -45,13 +47,13 @@ class PluginBridge {
      */
     PluginBridge(std::string plugin_dll_path, std::string socket_endpoint_path);
 
+    /**
+     * Block the main thread until the plugin shuts down.
+     */
+    void wait();
+
     intptr_t host_callback(AEffect*, int32_t, int32_t, intptr_t, void*, float);
 
-    // TODO: Remove debug loop
-    void dispatch_loop();
-
-    // TODO: Set up all callback handlers
-
    private:
     /**
      * The shared library handle of the VST plugin. I sadly could not get
@@ -82,4 +84,11 @@ class PluginBridge {
      * pass the Wine plugin's information to the host.
      */
     boost::asio::local::stream_protocol::socket vst_host_aeffect;
+
+    /**
+     * The thread that handles dispatch events from the host.
+     */
+    std::thread dispatch_handler;
+
+    // TODO: Set up all other callback handlers
 };

src/wine-host/vst-host.cpp

@@ -33,10 +33,10 @@ int main(int argc, char* argv[]) {
     const std::string socket_endpoint_path(argv[2]);
 
     try {
-        PluginBridge Pluginbridge(plugin_dll_path, socket_endpoint_path);
+        PluginBridge bridge(plugin_dll_path, socket_endpoint_path);
 
-        // TODO: Remove debug
-        Pluginbridge.dispatch_loop();
+        // Block the main thread until the plugin shuts down
+        bridge.wait();
     } catch (const std::runtime_error& error) {
         std::cerr << "Error while initializing plugin:" << std::endl;
         std::cerr << error.what() << std::endl;