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diff --git a/runtime/wti.h b/runtime/wti.h
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+/* Definition of the worker thread instance (wti) class.
+ *
+ * Copyright 2008-2012 Adiscon GmbH.
+ *
+ * This file is part of the rsyslog runtime library.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *       -or-
+ *       see COPYING.ASL20 in the source distribution
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WTI_H_INCLUDED
+#define WTI_H_INCLUDED
+
+#include <pthread.h>
+#include "wtp.h"
+#include "obj.h"
+#include "batch.h"
+
+
+/* the worker thread instance class */
+struct wti_s {
+	BEGINobjInstance;
+	pthread_t thrdID; 	/* thread ID */
+	int bIsRunning;	/* is this thread currently running? (must be int for atomic op!) */
+	sbool bAlwaysRunning;	/* should this thread always run? */
+	wtp_t *pWtp; /* my worker thread pool (important if only the work thread instance is passed! */
+	batch_t batch; /* pointer to an object array meaningful for current user pointer (e.g. queue pUsr data elemt) */
+	uchar *pszDbgHdr;	/* header string for debug messages */
+	DEF_ATOMIC_HELPER_MUT(mutIsRunning);
+};
+
+
+/* prototypes */
+rsRetVal wtiConstruct(wti_t **ppThis);
+rsRetVal wtiConstructFinalize(wti_t *pThis);
+rsRetVal wtiDestruct(wti_t **ppThis);
+rsRetVal wtiWorker(wti_t *pThis);
+rsRetVal wtiSetDbgHdr(wti_t *pThis, uchar *pszMsg, size_t lenMsg);
+rsRetVal wtiCancelThrd(wti_t *pThis);
+rsRetVal wtiSetAlwaysRunning(wti_t *pThis);
+rsRetVal wtiSetState(wti_t *pThis, sbool bNew);
+rsRetVal wtiWakeupThrd(wti_t *pThis);
+sbool wtiGetState(wti_t *pThis);
+PROTOTYPEObjClassInit(wti);
+PROTOTYPEpropSetMeth(wti, pszDbgHdr, uchar*);
+PROTOTYPEpropSetMeth(wti, pWtp, wtp_t*);
+
+#endif /* #ifndef WTI_H_INCLUDED */