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/* Definition of the threading support module.
 *
 * Copyright 2007 Rainer Gerhards and Adiscon GmbH.
 *
 * This file is part of rsyslog.
 *
 * Rsyslog is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Rsyslog is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Rsyslog.  If not, see <http://www.gnu.org/licenses/>.
 *
 * A copy of the GPL can be found in the file "COPYING" in this distribution.
 */

#ifndef THREADS_H_INCLUDED
#define THREADS_H_INCLUDED


/* type of sync tools for terminating the thread */
typedef enum eTermSyncType {
	eTermSync_NONE = 0,	/* no cleanup necessary, just cancel thread */
	eTermSync_SIGNAL	/* termination via pthread_kill() */
} eTermSyncType_t;

/* the thread object */
typedef struct thrdInfo {
	eTermSyncType_t	eTermTool;
	pthread_mutex_t *mutTermOK;	/* Is it ok to terminate that thread now? */
	int bIsActive;		/* Is thread running? */
	int bShallStop;		/* set to 1 if the thread should be stopped ? */
	rsRetVal (*pUsrThrdMain)(struct thrdInfo*); /* user thread main to be called in new thread */
	rsRetVal (*pAfterRun)(struct thrdInfo*);   /* cleanup function */
	pthread_t thrdID;
} thrdInfo_t;

/* this is the first approach to a queue, this time with static
 * memory.
 */
typedef struct {
	void** pbuf;
	long head, tail;
	int full, empty;
	pthread_mutex_t *mut;
	pthread_cond_t *notFull, *notEmpty;
} msgQueue;

/* prototypes */
rsRetVal thrdExit(void);
rsRetVal thrdInit(void);
rsRetVal thrdTerminate(thrdInfo_t *pThis);
rsRetVal thrdTerminateAll(void);
rsRetVal thrdCreate(rsRetVal (*thrdMain)(thrdInfo_t*), eTermSyncType_t eTermSyncType, rsRetVal(*afterRun)(thrdInfo_t *));
rsRetVal thrdSleep(thrdInfo_t *pThis, int iSeconds, int iuSeconds);
msgQueue *queueInit (void);
void queueDelete (msgQueue *q);
void queueAdd (msgQueue *q, void* in);
void queueDel (msgQueue *q, void **out);

/* go-away's */
extern int iMainMsgQueueSize;
extern msgQueue *pMsgQueue;


/* macros (replace inline functions) */
/*TODO: remove these macros once we now we can live without -- rgerhards, 2007-12-20
 * #define thrdBlockTermination(pThis) {dbgprintf("lock mutex\n"); pthread_mutex_lock((pThis)->mutTermOK)  ;}
 * #define thrdUnblockTermination(pThis) {dbgprintf("unlock mutex\n"); pthread_mutex_unlock((pThis)->mutTermOK)  ;}
 */
#define thrdBlockTermination(pThis)
#define thrdUnblockTermination(pThis)

#endif /* #ifndef THREADS_H_INCLUDED */