Fix sporadic kdesktop hang due to unsafe usage of asynchronous POSIX signals in the main GUI thread

1 files changed, 26 insertions, 3 deletions

diff --git a/kdesktop/lockeng.h b/kdesktop/lockeng.h
index 782f779a3..9827090b4 100644
--- a/kdesktop/lockeng.h
+++ b/kdesktop/lockeng.h
@@ -9,6 +9,7 @@
 #define __LOCKENG_H__
 
 #include <tqwidget.h>
+#include <tqthread.h>
 #include <kprocess.h>
 #include <tqvaluevector.h>
 #include "KScreensaverIface.h"
@@ -21,6 +22,20 @@ class DCOPClientTransaction;
 class TQT_DBusMessage;
 class TQT_DBusProxy;
 
+class SaverEngineThreadHelperObject : public TQObject
+{
+	Q_OBJECT
+	
+public slots:
+	void terminateThread();
+	void slotLockProcessWaiting();
+	void slotLockProcessFullyActivated();
+
+signals:
+	void lockProcessWaiting();
+	void lockProcessFullyActivated();
+};
+
 //===========================================================================
 /**
  * Screen saver engine.  Handles screensaver window, starting screensaver
@@ -91,16 +106,19 @@ public:
 	 */
 	bool waitForLockEngage();
 
+signals:
+	void terminateHelperThread();
+	void asyncLock();
+
 public slots:
-	void slotLockProcessWaiting();
-	void slotLockProcessFullyActivated();
 	void slotLockProcessReady();
+	void lockProcessWaiting();
+	void lockProcessFullyActivated();
 	void handleDBusSignal(const TQT_DBusMessage&);
 
 protected slots:
 	void idleTimeout();
 	void lockProcessExited();
-	void lockProcessWaiting();
 
 private slots:
 	void handleSecureDialog();
@@ -148,7 +166,12 @@ protected:
 	bool mBlankOnly;  // only use the blanker, not the defined saver
 	TQValueVector< DCOPClientTransaction* > mLockTransactions;
 
+public:
+	SaverEngineThreadHelperObject* m_threadHelperObject;
+
 private:
+	TQEventLoopThread* m_helperThread;
+	sigset_t mThreadBlockSet;
 	TDEProcess* mSAKProcess;
 	bool mTerminationRequested;
 	bool mSaverProcessReady;