diff -r 71ca22bcf22a -r 5a06f39ad45b khronosfws/openmax_al/src/engine/xathreadsyncitf.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/khronosfws/openmax_al/src/engine/xathreadsyncitf.c	Fri Apr 16 15:29:42 2010 +0300
@@ -0,0 +1,134 @@
+/*
+* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description: 
+*
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#include "xathreadsyncitf.h"
+
+/**
+ * Base interface XAThreadSyncItf Implementation
+ */
+XAresult XAThreadSyncItfImpl_EnterCriticalSection(XAThreadSyncItf self)
+{
+    XAresult ret = XA_RESULT_SUCCESS;
+    XAThreadSyncItfImpl* impl = NULL;
+
+    DEBUG_API("->XAThreadSyncItfImpl_EnterCriticalSection");
+
+    impl = (XAThreadSyncItfImpl*)(*self);
+    if( !impl || impl != impl->self )
+    {
+        DEBUG_ERR("XA_RESULT_PARAMETER_INVALID");
+        DEBUG_API("<-XAThreadSyncItfImpl_EnterCriticalSection");
+        return XA_RESULT_PARAMETER_INVALID;
+    }
+
+    if( impl->engInCritical )
+    {
+        /* The calling context must not already be in
+           critical section state. */
+        DEBUG_ERR("XA_RESULT_PRECONDITIONS_VIOLATED");
+        ret = XA_RESULT_PRECONDITIONS_VIOLATED;
+    }
+    else
+    {
+        ret = XAImpl_LockMutex( impl->engCriticalSection );
+        if(ret == XA_RESULT_SUCCESS)
+        {
+            impl->engInCritical = XA_BOOLEAN_TRUE;
+        }
+    }
+    DEBUG_API("<-XAThreadSyncItfImpl_EnterCriticalSection");
+    return ret;
+}
+
+XAresult XAThreadSyncItfImpl_ExitCriticalSection(XAThreadSyncItf self)
+{
+    XAThreadSyncItfImpl* impl = NULL;
+    XAresult ret = XA_RESULT_SUCCESS;
+
+    impl = (XAThreadSyncItfImpl*)(*self);
+    DEBUG_API("->XAThreadSyncItfImpl_ExitCriticalSection");
+
+    if( !impl || impl != impl->self )
+    {
+        DEBUG_ERR("XA_RESULT_PARAMETER_INVALID");
+        DEBUG_API("<-XAThreadSyncItfImpl_ExitCriticalSection");
+        return XA_RESULT_PARAMETER_INVALID;
+    }
+
+    if( impl->engInCritical  )
+    {
+        ret = XAImpl_UnlockMutex( impl->engCriticalSection );
+        if(ret == XA_RESULT_SUCCESS)
+        {
+            impl->engInCritical = XA_BOOLEAN_FALSE;
+        }
+    }
+    else
+    {
+        /* The engine must be in critical section state */
+        DEBUG_ERR("XA_RESULT_PRECONDITIONS_VIOLATED");
+        ret = XA_RESULT_PRECONDITIONS_VIOLATED;
+    }
+    DEBUG_API("<-XAThreadSyncItfImpl_ExitCriticalSection");
+    return ret;
+}
+
+/**
+ * XAThreadSyncItfImpl -specific methods
+ **/
+
+XAThreadSyncItfImpl* XAThreadSyncItfImpl_Create()
+{
+    XAThreadSyncItfImpl *self = NULL;
+    DEBUG_API("->XAThreadSyncItfImpl_Create");
+
+    self = (XAThreadSyncItfImpl*)calloc(1,sizeof(XAThreadSyncItfImpl));
+
+    if( self )
+    {
+        /* init itf default implementation */
+        self->itf.EnterCriticalSection = XAThreadSyncItfImpl_EnterCriticalSection;
+        self->itf.ExitCriticalSection = XAThreadSyncItfImpl_ExitCriticalSection;
+
+        if( XAImpl_CreateMutex( &(self->engCriticalSection) )
+            != XA_RESULT_SUCCESS )
+        {
+            DEBUG_ERR("Mutex creation failed, abort");
+            free(self);
+            DEBUG_API("<-XAThreadSyncItfImpl_Create");
+            return NULL;
+        }
+
+        self->self = self;
+    }
+    DEBUG_API("<-XAThreadSyncItfImpl_Create");
+    return self;
+}
+
+void XAThreadSyncItfImpl_Free(XAThreadSyncItfImpl* self)
+{
+    DEBUG_API("->XAThreadSyncItfImpl_Free");
+    assert(self==self->self);
+    XAImpl_DeleteMutex(self->engCriticalSection);
+    free(self);
+    DEBUG_API("<-XAThreadSyncItfImpl_Free");
+}
+