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/* Definition of the queue support module.
*
* Copyright 2008 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 QUEUE_H_INCLUDED
#define QUEUE_H_INCLUDED
#include <pthread.h>
/* queue types */
typedef enum {
QUEUETYPE_FIXED_ARRAY = 0,/* a simple queue made out of a fixed (initially malloced) array fast but memoryhog */
QUEUETYPE_LINKEDLIST = 1, /* linked list used as buffer, lower fixed memory overhead but slower */
QUEUETYPE_DISK = 2 /* disk files used as buffer */
} queueType_t;
/* list member definition for linked list types of queues: */
typedef struct qLinkedList_S {
struct qLinkedList_S *pNext;
void *pUsr;
} qLinkedList_t;
/* the queue object */
typedef struct queue_s {
queueType_t qType;
int iQueueSize; /* Current number of elements in the queue */
int iMaxQueueSize; /* how large can the queue grow? */
pthread_t thrdWorker; /* ID of the worker thread associated with this queue */
int bDoRun; /* 1 - run queue, 0 - shutdown of queue requested */
rsRetVal (*pConsumer)(void *); /* user-supplied consumer function for dequeued messages */
/* type-specific handlers (set during construction) */
rsRetVal (*qConstruct)(struct queue_s *pThis);
rsRetVal (*qDestruct)(struct queue_s *pThis);
rsRetVal (*qAdd)(struct queue_s *pThis, void *pUsr);
rsRetVal (*qDel)(struct queue_s *pThis, void **ppUsr);
/* the following two are currently only required for disk queuing, but
* we keep them global because we otherwise needed to change the interface
* too much.
*/
rsRetVal (*serializer)(uchar **ppOutBuf, size_t *lenBuf, void *pUsr);
rsRetVal (*deSerializer)(void *ppUsr, uchar *ppBuf, size_t lenBuf);
/* end type-specific handler */
/* synchronization variables */
pthread_mutex_t *mut;
pthread_cond_t *notFull, *notEmpty;
/* end sync variables */
union { /* different data elements based on queue type (qType) */
struct {
long head, tail;
void** pBuf; /* the queued user data structure */
} farray;
struct {
qLinkedList_t *pRoot;
qLinkedList_t *pLast;
} linklist;
struct {
uchar *pszSpoolDir;
size_t lenSpoolDir;
uchar *pszFilePrefix;
size_t lenFilePrefix;
int iCurrFileNum; /* number of file currently processed */
int fd; /* current file descriptor */
long iWritePos; /* next write position offset */
long iReadPos; /* next read position offset */
} disk;
} tVars;
} queue_t;
/* prototypes */
rsRetVal queueDestruct(queue_t *pThis);
rsRetVal queueEnqObj(queue_t *pThis, void *pUsr);
rsRetVal queueConstruct(queue_t **ppThis, queueType_t qType, int iMaxQueueSize, rsRetVal (*pConsumer)(void*),
rsRetVal (*serializer)(uchar **ppOutBuf, size_t *lenBuf, void *pUsr),
rsRetVal (*deSerializer)(void *ppUsr, uchar *ppBuf, size_t lenBuf)
);
#endif /* #ifndef QUEUE_H_INCLUDED */
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