fix up framestep too

src/frontend/qt_sdl/EmuThread.cpp

@@ -461,10 +461,10 @@ void EmuThread::sendMessage(Message msg)
     msgMutex.unlock();
 }
 
-void EmuThread::waitMessage()
+void EmuThread::waitMessage(int num)
 {
     if (QThread::currentThread() == this) return;
-    msgSemaphore.acquire();
+    msgSemaphore.acquire(num);
 }
 
 void EmuThread::waitAllMessages()
@@ -537,6 +537,10 @@ void EmuThread::handleMessages()
             emit windowEmuStop();
             break;
 
+        case msg_EmuFrameStep:
+            emuStatus = emuStatus_FrameStep;
+            break;
+
         case msg_InitGL:
             emuInstance->initOpenGL();
             useOpenGL = true;
@@ -610,8 +614,10 @@ void EmuThread::emuExit()
 
 void EmuThread::emuFrameStep()
 {
-    //if (emuPauseStack < emuPauseStackPauseThreshold) emit windowEmuPause();
-    emuStatus = emuStatus_FrameStep;
+    if (emuPauseStack < emuPauseStackPauseThreshold)
+        sendMessage(msg_EmuPause);
+    sendMessage(msg_EmuFrameStep);
+    waitAllMessages();
 }
 
 bool EmuThread::emuIsRunning()

src/frontend/qt_sdl/EmuThread.h

@@ -63,6 +63,7 @@ public:
         msg_EmuPause,
         msg_EmuUnpause,
         msg_EmuStop,
+        msg_EmuFrameStep,
 
         msg_InitGL,
         msg_DeInitGL,
@@ -78,7 +79,7 @@ public:
     };
 
     void sendMessage(Message msg);
-    void waitMessage();
+    void waitMessage(int num = 1);
     void waitAllMessages();
 
     void sendMessage(MessageType type)