Do need queue here. Writes async now.

src/discord-rpc.cpp

@@ -10,17 +10,45 @@
 #include <condition_variable>
 #include <thread>
 
+constexpr size_t MaxMessageSize = 16 * 1024;
+constexpr size_t MessageQueueSize = 8;
+
+struct QueuedMessage {
+    size_t length;
+    char buffer[MaxMessageSize];
+};
+
 static RpcConnection* Connection{nullptr};
 static char ApplicationId[64]{};
 static DiscordEventHandlers Handlers{};
 static std::atomic_bool WasJustConnected{false};
 static std::atomic_bool WasJustDisconnected{false};
-static int LastErrorCode = 0;
+static int LastErrorCode{0};
 static char LastErrorMessage[256];
 static std::atomic_bool KeepRunning{true};
 static std::mutex WaitForIOMutex;
 static std::condition_variable WaitForIOActivity;
 static std::thread IoThread;
+static QueuedMessage SendQueue[MessageQueueSize]{};
+static std::atomic_uint SendQueueNextAdd{0};
+static std::atomic_uint SendQueueNextSend{0};
+static std::atomic_uint SendQueuePendingSends{0};
+
+static QueuedMessage* SendQueueGetNextAddMessage() {
+    // if we are falling behind, bail
+    if (SendQueuePendingSends.load() >= MessageQueueSize) {
+        return nullptr;
+    }
+    auto index = (SendQueueNextAdd++) % MessageQueueSize;
+    return &SendQueue[index];
+}
+static QueuedMessage* SendQueueGetNextSendMessage() {
+    auto index = (SendQueueNextSend++) % MessageQueueSize;
+    return &SendQueue[index];
+}
+static void SendQueueCommitMessage() {
+    SendQueuePendingSends++;
+}
 
 void Discord_UpdateConnection()
 {
@@ -34,12 +62,18 @@ void Discord_UpdateConnection()
             // todo: do something...
             printf("Hey, I got a message\n");
         }
+
+        // writes
+        while (SendQueuePendingSends.load()) {
+            auto qmessage = SendQueueGetNextSendMessage();
+            Connection->Write(qmessage->buffer, qmessage->length);
+            --SendQueuePendingSends;
+        }
     }
 }
 
 void DiscordRpcIo()
 {
-    printf("Discord io thread start\n");
     const std::chrono::duration<int64_t, std::milli> maxWait{500LL};
     
     while (KeepRunning.load()) {
@@ -48,8 +82,6 @@ void DiscordRpcIo()
         std::unique_lock<std::mutex> lock(WaitForIOMutex);
         WaitForIOActivity.wait_for(lock, maxWait);
     }
-    Connection->Close();
-    printf("Discord io thread stop\n");
 }
 
 void SignalIOActivity()
@@ -94,13 +126,15 @@ extern "C" void Discord_Shutdown()
 
 extern "C" void Discord_UpdatePresence(const DiscordRichPresence* presence)
 {
-    char jsonBuffer[16 * 1024];
-    char* jsonWrite = jsonBuffer;
+    auto qmessage = SendQueueGetNextAddMessage();
+    if (qmessage) {
+        char* jsonWrite = qmessage->buffer;
         JsonWriteRichPresenceObj(jsonWrite, presence);
-    size_t length = jsonWrite - jsonBuffer;
-    Connection->Write(jsonBuffer, length);
+        qmessage->length = jsonWrite - qmessage->buffer;
+        SendQueueCommitMessage();
         SignalIOActivity();
     }
+}
 
 extern "C" void Discord_Update()
 {