Changeset 8897 in vbox for trunk/src/VBox/Additions/WINNT/VBoxTray

Timestamp:

May 16, 2008 2:06:46 PM (17 years ago)

Author:

vboxsync

Message:

Windows Guest VBoxTray: Implemented single instance checking (global mutex).

File:

• trunk/src/VBox/Additions/WINNT/VBoxTray/VBoxTray.cpp (modified) (1 diff)

trunk/src/VBox/Additions/WINNT/VBoxTray/VBoxTray.cpp

@@ -535 +535 @@
 int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
 {
-    dprintf(("VBoxService: WinMain\n"));
+    /* Do not use a global namespace ("Global\\") for mutex name here, will blow up NT4 compatibility! */
+    HANDLE hMutexAppRunning = CreateMutex (NULL, FALSE, "VBoxTray");
+    if (   (hMutexAppRunning != NULL) 
+        && (GetLastError() == ERROR_ALREADY_EXISTS))
+   {
+      /* Close the mutex for this application instance. */
+      CloseHandle (hMutexAppRunning);
+      hMutexAppRunning = NULL;
+      return 0;
+   }
+
+    dprintf(("VBoxService: Started.\n"));
+
     gInstance = hInstance;
     VBoxServiceStart();
-    
+
+    dprintf(("VBoxService: Ended.\n"));
+
+    /* Release instance mutex. */
+    if (hMutexAppRunning != NULL) {
+        CloseHandle (hMutexAppRunning);
+        hMutexAppRunning = NULL;
+    }
+
     return 0;
 }