- Use Interlocked* functions in AddRef and Release.

dlls/d3dx8/d3dxbuffer.c

@@ -51,14 +51,19 @@ HRESULT WINAPI ID3DXBufferImpl_QueryInterface(LPD3DXBUFFER iface, REFIID riid, L
 
 ULONG WINAPI ID3DXBufferImpl_AddRef(LPD3DXBUFFER iface) {
   ID3DXBufferImpl *This = (ID3DXBufferImpl *)iface;
-  TRACE("(%p) : AddRef from %ld\n", This, This->ref);
-  return ++(This->ref);
+  ULONG ref = InterlockedIncrement(&This->ref);
+
+  TRACE("(%p) : AddRef from %ld\n", This, ref - 1);
+
+  return ref;
 }
 
 ULONG WINAPI ID3DXBufferImpl_Release(LPD3DXBUFFER iface) {
   ID3DXBufferImpl *This = (ID3DXBufferImpl *)iface;
-  ULONG ref = --This->ref;
-  TRACE("(%p) : ReleaseRef to %ld\n", This, This->ref);
+  ULONG ref = InterlockedDecrement(&This->ref);
+
+  TRACE("(%p) : ReleaseRef to %ld\n", This, ref);
+
   if (ref == 0) {
     HeapFree(GetProcessHeap(), 0, This->buffer);
     HeapFree(GetProcessHeap(), 0, This);

dlls/dmband/band.c

@@ -56,14 +56,19 @@ HRESULT WINAPI IDirectMusicBandImpl_IUnknown_QueryInterface (LPUNKNOWN iface, RE
 
 ULONG WINAPI IDirectMusicBandImpl_IUnknown_AddRef (LPUNKNOWN iface) {
 	ICOM_THIS_MULTI(IDirectMusicBandImpl, UnknownVtbl, iface);
-	TRACE("(%p) : AddRef from %ld\n", This, This->ref);
-	return ++(This->ref);
+        ULONG ref = InterlockedIncrement(&This->ref);
+
+	TRACE("(%p) : AddRef from %ld\n", This, ref - 1);
+
+	return ref;
 }
 
 ULONG WINAPI IDirectMusicBandImpl_IUnknown_Release (LPUNKNOWN iface) {
 	ICOM_THIS_MULTI(IDirectMusicBandImpl, UnknownVtbl, iface);
-	ULONG ref = --This->ref;
-	TRACE("(%p) : ReleaseRef to %ld\n", This, This->ref);
+	ULONG ref = InterlockedDecrement(&This->ref);
+
+	TRACE("(%p) : ReleaseRef to %ld\n", This, ref);
+
 	if (ref == 0) {
 		HeapFree(GetProcessHeap(), 0, This);
 	}

dlls/dmband/bandtrack.c

@@ -51,14 +51,19 @@ HRESULT WINAPI IDirectMusicBandTrack_IUnknown_QueryInterface (LPUNKNOWN iface, R
 
 ULONG WINAPI IDirectMusicBandTrack_IUnknown_AddRef (LPUNKNOWN iface) {
   ICOM_THIS_MULTI(IDirectMusicBandTrack, UnknownVtbl, iface);
-  TRACE("(%p) : AddRef from %ld\n", This, This->ref);
-  return ++(This->ref);
+  ULONG ref = InterlockedIncrement(&This->ref);
+
+  TRACE("(%p) : AddRef from %ld\n", This, ref - 1);
+
+  return ref;
 }
 
 ULONG WINAPI IDirectMusicBandTrack_IUnknown_Release (LPUNKNOWN iface) {
   ICOM_THIS_MULTI(IDirectMusicBandTrack, UnknownVtbl, iface);
-  ULONG ref = --This->ref;
-  TRACE("(%p) : ReleaseRef to %ld\n", This, This->ref);
+  ULONG ref = InterlockedDecrement(&This->ref);
+
+  TRACE("(%p) : ReleaseRef to %ld\n", This, ref);
+
   if (ref == 0) {
     HeapFree(GetProcessHeap(), 0, This);
   }

dlls/dmband/dmband_main.c

@@ -39,13 +39,13 @@ static HRESULT WINAPI BandCF_QueryInterface(LPCLASSFACTORY iface,REFIID riid,LPV
 
 static ULONG WINAPI BandCF_AddRef(LPCLASSFACTORY iface) {
 	IClassFactoryImpl *This = (IClassFactoryImpl *)iface;
-	return ++(This->ref);
+	return InterlockedIncrement(&This->ref);
 }
 
 static ULONG WINAPI BandCF_Release(LPCLASSFACTORY iface) {
 	IClassFactoryImpl *This = (IClassFactoryImpl *)iface;
 	/* static class, won't be  freed */
-	return --(This->ref);
+	return InterlockedDecrement(&This->ref);
 }
 
 static HRESULT WINAPI BandCF_CreateInstance(LPCLASSFACTORY iface, LPUNKNOWN pOuter, REFIID riid, LPVOID *ppobj) {
@@ -84,13 +84,13 @@ static HRESULT WINAPI BandTrackCF_QueryInterface(LPCLASSFACTORY iface,REFIID rii
 
 static ULONG WINAPI BandTrackCF_AddRef(LPCLASSFACTORY iface) {
 	IClassFactoryImpl *This = (IClassFactoryImpl *)iface;
-	return ++(This->ref);
+	return InterlockedIncrement(&This->ref);
 }
 
 static ULONG WINAPI BandTrackCF_Release(LPCLASSFACTORY iface) {
 	IClassFactoryImpl *This = (IClassFactoryImpl *)iface;
 	/* static class, won't be  freed */
-	return --(This->ref);
+	return InterlockedDecrement(&This->ref);
 }
 
 static HRESULT WINAPI BandTrackCF_CreateInstance(LPCLASSFACTORY iface, LPUNKNOWN pOuter, REFIID riid, LPVOID *ppobj) {