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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>
#include "obj.h"
/* some information about disk files used by the queue. In the long term, we may
* export this settings to a separate file module - or not (if they are too
* queue-specific. I just thought I mention it here so that everyone is aware
* of this possibility. -- rgerhards, 2008-01-07
*/
typedef struct {
int fd; /* the file descriptor, -1 if closed */
uchar *pszFileName; /* name of current file (if open) */
int iCurrFileNum;/* current file number (NOT descriptor, but the number in the file name!) */
int iCurrOffs; /* current offset */
uchar *pIOBuf; /* io Buffer */
int iBufPtrMax; /* current max Ptr in Buffer (if partial read!) */
int iBufPtr; /* pointer into current buffer */
int iUngetC; /* char set via UngetChar() call or -1 if none set */
} queueFileDescription_t;
#define qFILE_IOBUF_SIZE 4096 /* size of the IO buffer */
/* 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_DIRECT = 3 /* no queuing happens, consumer is directly called */
} 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? */
int iNumWorkerThreads;/* number of worker threads to use */
pthread_t *pWorkerThreads;/* array with ID of the worker thread(s) 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);
/* 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 iNumberFiles; /* how many files make up the queue? */
int iMaxFileSize; /* max size for a single queue file */
queueFileDescription_t fWrite; /* current file to be written */
queueFileDescription_t fRead; /* current file to be read */
} disk;
} tVars;
} queue_t;
/* prototypes */
rsRetVal queueDestruct(queue_t *pThis);
rsRetVal queueEnqObj(queue_t *pThis, void *pUsr);
rsRetVal queueStart(queue_t *pThis);
rsRetVal queueConstruct(queue_t **ppThis, queueType_t qType, int iWorkerThreads,
int iMaxQueueSize, rsRetVal (*pConsumer)(void*));
#endif /* #ifndef QUEUE_H_INCLUDED */
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