重构SteamMessageHandler，移除多余线程，改用定时器实现异步轮询，优化消息接收逻辑

steam/steam_message_handler.cpp

@@ -2,12 +2,11 @@
 #include <iostream>
 #include <cstring>
 #include <chrono>
-#include <thread>
 #include <steam_api.h>
 #include <isteamnetworkingsockets.h>
 
 SteamMessageHandler::SteamMessageHandler(boost::asio::io_context& io_context, ISteamNetworkingSockets* interface, std::vector<HSteamNetConnection>& connections, std::mutex& connectionsMutex, bool& g_isHost, int& localPort)
-    : io_context_(io_context), m_pInterface_(interface), connections_(connections), connectionsMutex_(connectionsMutex), g_isHost_(g_isHost), localPort_(localPort), running_(false) {}
+    : io_context_(io_context), m_pInterface_(interface), connections_(connections), connectionsMutex_(connectionsMutex), g_isHost_(g_isHost), localPort_(localPort), running_(false), currentPollInterval_(0) {}
 
 SteamMessageHandler::~SteamMessageHandler() {
     stop();
@@ -16,23 +15,15 @@ SteamMessageHandler::~SteamMessageHandler() {
 void SteamMessageHandler::start() {
     if (running_) return;
     running_ = true;
-    thread_ = std::thread([this]() { run(); });
-    // Start io_context in a separate thread
-    io_thread_ = std::thread([this]() {
-        auto work = boost::asio::make_work_guard(io_context_);
-        io_context_.run();
-    });
+    timer_ = std::make_unique<boost::asio::steady_timer>(io_context_);
+    startAsyncPoll();
 }
 
 void SteamMessageHandler::stop() {
     if (!running_) return;
     running_ = false;
-    io_context_.stop();
-    if (thread_.joinable()) {
-        thread_.join();
-    }
-    if (io_thread_.joinable()) {
-        io_thread_.join();
+    if (timer_) {
+        timer_->cancel();
     }
 }
 
@@ -43,20 +34,14 @@ std::shared_ptr<MultiplexManager> SteamMessageHandler::getMultiplexManager(HStea
     return multiplexManagers_[conn];
 }
 
-void SteamMessageHandler::run() {
-    while (running_) {
-        // Poll networking
+void SteamMessageHandler::startAsyncPoll() {
+    if (!running_) return;
+    
+    // Poll networking callbacks
     m_pInterface_->RunCallbacks();
     
-        // Receive messages
-        pollMessages();
-
-        // Sleep a bit to avoid busy loop
-        std::this_thread::sleep_for(std::chrono::milliseconds(1));
-    }
-}
-
-void SteamMessageHandler::pollMessages() {
+    // Receive messages and check if any were received
+    int totalMessages = 0;
     std::vector<HSteamNetConnection> currentConnections;
     {
         std::lock_guard<std::mutex> lockConn(connectionsMutex_);
@@ -65,6 +50,7 @@ void SteamMessageHandler::pollMessages() {
     for (auto conn : currentConnections) {
         ISteamNetworkingMessage* pIncomingMsgs[10];
         int numMsgs = m_pInterface_->ReceiveMessagesOnConnection(conn, pIncomingMsgs, 10);
+        totalMessages += numMsgs;
         for (int i = 0; i < numMsgs; ++i) {
             ISteamNetworkingMessage* pIncomingMsg = pIncomingMsgs[i];
             const char* data = (const char*)pIncomingMsg->m_pData;
@@ -77,4 +63,21 @@ void SteamMessageHandler::pollMessages() {
             pIncomingMsg->Release();
         }
     }
+    
+    // Adaptive polling: if messages received, poll immediately; otherwise increase interval
+    if (totalMessages > 0) {
+        currentPollInterval_ = 0; // 有消息，立即轮询
+    } else {
+        // 无消息，逐渐增加间隔，最大10ms
+        currentPollInterval_ = std::min(currentPollInterval_ + 1, 10);
     }
+    
+    // Schedule next poll
+    timer_->expires_after(std::chrono::milliseconds(currentPollInterval_));
+    timer_->async_wait([this](const boost::system::error_code& error) {
+        if (!error && running_) {
+            startAsyncPoll();
+        }
+    });
+}
+

steam/steam_message_handler.h

@@ -22,8 +22,7 @@ public:
     std::shared_ptr<MultiplexManager> getMultiplexManager(HSteamNetConnection conn);
 
 private:
-    void run();
-    void pollMessages();
+    void startAsyncPoll();
 
     boost::asio::io_context& io_context_;
     ISteamNetworkingSockets* m_pInterface_;
@@ -34,9 +33,9 @@ private:
 
     std::map<HSteamNetConnection, std::shared_ptr<MultiplexManager>> multiplexManagers_;
 
-    std::thread thread_;
-    std::thread io_thread_;
+    std::unique_ptr<boost::asio::steady_timer> timer_;
     bool running_;
+    int currentPollInterval_; // 当前轮询间隔（毫秒）
 };
 
 #endif // STEAM_MESSAGE_HANDLER_H