Phonon: improve locking to make it safer to load a source

Task-number: 259482

2 files changed, 25 insertions, 17 deletions

diff --git a/src/3rdparty/phonon/ds9/mediaobject.cpp b/src/3rdparty/phonon/ds9/mediaobject.cpp
index 23e392c0a7..f7fd6aec0e 100644
--- a/src/3rdparty/phonon/ds9/mediaobject.cpp
+++ b/src/3rdparty/phonon/ds9/mediaobject.cpp
@@ -192,8 +192,11 @@ namespace Phonon
 
             HRESULT hr = S_OK;
 
-            m_currentRender = w.graph;
-			m_currentRenderId = w.id;
+            {
+                QMutexLocker locker(&m_currentMutex);
+                m_currentRender = w.graph;
+                m_currentRenderId = w.id;
+            }
             if (w.task == ReplaceGraph) {
                 HANDLE h;
 
@@ -218,9 +221,6 @@ namespace Phonon
                     m_graphHandle[index].handle = h;
                 }
             } else if (w.task == Render) {
-                //we need to unlock here because the use might trigger a call to abort
-                //which uses the same mutex
-                locker.unlock();
                 if (w.filter) {
                     //let's render pins
                     w.graph->AddFilter(w.filter, 0);
@@ -239,7 +239,6 @@ namespace Phonon
                 if (hr != E_ABORT) {
 					emit asyncRenderFinished(w.id, hr, w.graph);
                 }
-                locker.relock();
             } else if (w.task == Seek) {
                 //that's a seekrequest
                 ComPointer<IMediaSeeking> mediaSeeking(w.graph, IID_IMediaSeeking);
@@ -312,13 +311,22 @@ namespace Phonon
                 }
             }
 
-            m_currentRender = Graph();
-			m_currentRenderId = 0;
-
+            {
+                QMutexLocker locker(&m_currentMutex);
+                m_currentRender = Graph();
+                m_currentRenderId = 0;
+            }
         }
 
-		void WorkerThread::abortCurrentRender(qint16 renderId)
-		{
+        void WorkerThread::abortCurrentRender(qint16 renderId)
+        {
+            {
+                QMutexLocker locker(&m_currentMutex);
+                if (m_currentRender && m_currentRenderId == renderId) {
+                    m_currentRender->Abort();
+                }
+            }
+
             QMutexLocker locker(&m_mutex);
             bool found = false;
             //we try to see if there is already an attempt to seek and we remove it
@@ -327,13 +335,12 @@ namespace Phonon
                 if (w.id == renderId) {
                     found = true;
                     m_queue.removeAt(i);
+                    if (m_queue.isEmpty()) {
+                        m_waitCondition.reset();
+                    }
                 }
             }
-
-			if (m_currentRender && m_currentRenderId == renderId) {
-				m_currentRender->Abort();
-			}
-		}
+        }
 
         //tells the thread to stop processing
         void WorkerThread::signalStop()
diff --git a/src/3rdparty/phonon/ds9/mediaobject.h b/src/3rdparty/phonon/ds9/mediaobject.h
index fe52604aeb..a6beb5f593 100644
--- a/src/3rdparty/phonon/ds9/mediaobject.h
+++ b/src/3rdparty/phonon/ds9/mediaobject.h
@@ -143,7 +143,8 @@ namespace Phonon
             bool m_finished;
             quint16 m_currentWorkId;
             QWinWaitCondition m_waitCondition;
-            QMutex m_mutex;
+            QMutex m_mutex; // mutex for the m_queue, m_finished and m_currentWorkId
+            QMutex m_currentMutex; //mutex for current renderer and id
 
             //this is for WaitForMultipleObjects
             struct