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/* Definition of the queue support module.
*
* Copyright 2008 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of the rsyslog runtime library.
*
* The rsyslog runtime library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The rsyslog runtime library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the rsyslog runtime library. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
* A copy of the LGPL can be found in the file "COPYING.LESSER" in this distribution.
*/
#ifndef QUEUE_H_INCLUDED
#define QUEUE_H_INCLUDED
#include <pthread.h>
#include "obj.h"
#include "wtp.h"
#include "batch.h"
#include "stream.h"
#include "statsobj.h"
/* support for the toDelete list */
typedef struct toDeleteLst_s toDeleteLst_t;
struct toDeleteLst_s {
qDeqID deqID;
int nElemDeq; /* numbe of elements that were dequeued and as such must now be discarded */
struct toDeleteLst_s *pNext;
};
/* 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 */
struct queue_s {
BEGINobjInstance;
queueType_t qType;
int nLogDeq; /* number of elements currently logically dequeued */
int bShutdownImmediate; /* should all workers cease processing messages? */
sbool bEnqOnly; /* does queue run in enqueue-only mode (1) or not (0)? */
sbool bSaveOnShutdown;/* persists everthing on shutdown (if DA!)? 1-yes, 0-no */
sbool bQueueStarted; /* has queueStart() been called on this queue? 1-yes, 0-no */
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 */
int iCurNumWrkThrd;/* current number of active worker threads */
int iMinMsgsPerWrkr;/* minimum nbr of msgs per worker thread, if more, a new worker is started until max wrkrs */
wtp_t *pWtpDA;
wtp_t *pWtpReg;
void *pUsr; /* a global, user-supplied pointer. Is passed back to consumer. */
int iUpdsSincePersist;/* nbr of queue updates since the last persist call */
int iPersistUpdCnt; /* persits queue info after this nbr of updates - 0 -> persist only on shutdown */
sbool bSyncQueueFiles;/* if working with files, sync them after each write? */
int iHighWtrMrk; /* high water mark for disk-assisted memory queues */
int iLowWtrMrk; /* low water mark for disk-assisted memory queues */
int iDiscardMrk; /* if the queue is above this mark, low-severity messages are discarded */
int iFullDlyMrk; /* if the queue is above this mark, FULL_DELAYable message are put on hold */
int iLightDlyMrk; /* if the queue is above this mark, LIGHT_DELAYable message are put on hold */
int iDiscardSeverity;/* messages of this severity above are discarded on too-full queue */
sbool bNeedDelQIF; /* does the QIF file need to be deleted when queue becomes empty? */
int toQShutdown; /* timeout for regular queue shutdown in ms */
int toActShutdown; /* timeout for long-running action shutdown in ms */
int toWrkShutdown; /* timeout for idle workers in ms, -1 means indefinite (0 is immediate) */
toDeleteLst_t *toDeleteLst;/* this queue's to-delete list */
int toEnq; /* enqueue timeout */
int iDeqBatchSize; /* max number of elements that shall be dequeued at once */
/* rate limiting settings (will be expanded) */
int iDeqSlowdown; /* slow down dequeue by specified nbr of microseconds */
/* end rate limiting */
/* dequeue time window settings (may also be expanded) */
int iDeqtWinFromHr; /* begin of dequeue time window (hour only) */
int iDeqtWinToHr; /* end of dequeue time window (hour only), set to 25 to disable deq window! */
/* note that begin and end have specific semantics. It is a big difference if we have
* begin 4, end 22 or begin 22, end 4. In the later case, dequeuing will run from 10p,
* throughout the night and stop at 4 in the morning. In the first case, it will start
* at 4am, run throughout the day, and stop at 10 in the evening! So far, not logic is
* applied to detect user configuration errors (and tell me how should we detect what
* the user really wanted...). -- rgerhards, 2008-04-02
*/
/* end dequeue time window */
rsRetVal (*pConsumer)(void *,batch_t*,int*); /* user-supplied consumer function for dequeued messages */
/* calling interface for pConsumer: arg1 is the global user pointer from this structure, arg2 is the
* user pointer array that was dequeued (actual sample: for actions, arg1 is the pAction and arg2
* is pointer to an array of message message pointers), arg3 is a pointer to an interger which is zero
* during normal operations and one if the consumer must urgently shut down.
*/
/* 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 (*qDeq)(struct queue_s *pThis, void **ppUsr);
rsRetVal (*qDel)(struct queue_s *pThis);
/* end type-specific handler */
/* public entry points (set during construction, permit to set best algorithm for params selected) */
rsRetVal (*MultiEnq)(qqueue_t *pThis, multi_submit_t *pMultiSub);
/* end public entry points */
/* synchronization variables */
pthread_mutex_t mutThrdMgmt; /* mutex for the queue's thread management */
pthread_mutex_t *mut; /* mutex for enqueing and dequeueing messages */
pthread_cond_t notFull, notEmpty;
pthread_cond_t belowFullDlyWtrMrk; /* below eFLOWCTL_FULL_DELAY watermark */
pthread_cond_t belowLightDlyWtrMrk; /* below eFLOWCTL_FULL_DELAY watermark */
int bThrdStateChanged; /* at least one thread state has changed if 1 */
/* end sync variables */
/* the following variables are always present, because they
* are not only used for the "disk" queueing mode but also for
* any other queueing mode if it is set to "disk assisted".
* rgerhards, 2008-01-09
*/
uchar *pszSpoolDir;
size_t lenSpoolDir;
uchar *pszFilePrefix;
size_t lenFilePrefix;
int iNumberFiles; /* how many files make up the queue? */
int64 iMaxFileSize; /* max size for a single queue file */
int64 sizeOnDiskMax; /* maximum size on disk allowed */
qDeqID deqIDAdd; /* next dequeue ID to use during add to queue store */
qDeqID deqIDDel; /* queue store delete position */
int bIsDA; /* is this queue disk assisted? */
struct queue_s *pqDA; /* queue for disk-assisted modes */
struct queue_s *pqParent;/* pointer to the parent (if this is a child queue) */
int bDAEnqOnly; /* EnqOnly setting for DA queue */
/* now follow queueing mode specific data elements */
union { /* different data elements based on queue type (qType) */
struct {
long deqhead, head, tail;
void** pBuf; /* the queued user data structure */
} farray;
struct {
qLinkedList_t *pDeqRoot;
qLinkedList_t *pDelRoot;
qLinkedList_t *pLast;
} linklist;
struct {
int64 sizeOnDisk; /* current amount of disk space used */
int64 bytesRead; /* number of bytes read from current (undeleted!) file */
strm_t *pWrite; /* current file to be written */
strm_t *pReadDeq; /* current file for dequeueing */
strm_t *pReadDel; /* current file for deleting */
} disk;
} tVars;
DEF_ATOMIC_HELPER_MUT(mutQueueSize);
DEF_ATOMIC_HELPER_MUT(mutLogDeq);
/* for statistics subsystem */
statsobj_t *statsobj;
STATSCOUNTER_DEF(ctrEnqueued, mutCtrEnqueued);
STATSCOUNTER_DEF(ctrFull, mutCtrFull);
int ctrMaxqsize;
};
/* the define below is an "eternal" timeout for the timeout settings which require a value.
* It is one day, which is not really eternal, but comes close to it if we think about
* rsyslog (e.g.: do you want to wait on shutdown for more than a day? ;))
* rgerhards, 2008-01-17
*/
#define QUEUE_TIMEOUT_ETERNAL 24 * 60 * 60 * 1000
/* prototypes */
rsRetVal qqueueDestruct(qqueue_t **ppThis);
rsRetVal qqueueEnqObjDirect(qqueue_t *pThis, void *pUsr);
rsRetVal qqueueEnqObj(qqueue_t *pThis, flowControl_t flwCtlType, void *pUsr);
rsRetVal qqueueStart(qqueue_t *pThis);
rsRetVal qqueueSetMaxFileSize(qqueue_t *pThis, size_t iMaxFileSize);
rsRetVal qqueueSetFilePrefix(qqueue_t *pThis, uchar *pszPrefix, size_t iLenPrefix);
rsRetVal qqueueConstruct(qqueue_t **ppThis, queueType_t qType, int iWorkerThreads,
int iMaxQueueSize, rsRetVal (*pConsumer)(void*,batch_t*, int*));
rsRetVal qqueueEnqObjDirectBatch(qqueue_t *pThis, batch_t *pBatch);
PROTOTYPEObjClassInit(qqueue);
PROTOTYPEpropSetMeth(qqueue, iPersistUpdCnt, int);
PROTOTYPEpropSetMeth(qqueue, bSyncQueueFiles, int);
PROTOTYPEpropSetMeth(qqueue, iDeqtWinFromHr, int);
PROTOTYPEpropSetMeth(qqueue, iDeqtWinToHr, int);
PROTOTYPEpropSetMeth(qqueue, toQShutdown, long);
PROTOTYPEpropSetMeth(qqueue, toActShutdown, long);
PROTOTYPEpropSetMeth(qqueue, toWrkShutdown, long);
PROTOTYPEpropSetMeth(qqueue, toEnq, long);
PROTOTYPEpropSetMeth(qqueue, iHighWtrMrk, int);
PROTOTYPEpropSetMeth(qqueue, iLowWtrMrk, int);
PROTOTYPEpropSetMeth(qqueue, iDiscardMrk, int);
PROTOTYPEpropSetMeth(qqueue, iDiscardSeverity, int);
PROTOTYPEpropSetMeth(qqueue, iMinMsgsPerWrkr, int);
PROTOTYPEpropSetMeth(qqueue, bSaveOnShutdown, int);
PROTOTYPEpropSetMeth(qqueue, pUsr, void*);
PROTOTYPEpropSetMeth(qqueue, iDeqSlowdown, int);
PROTOTYPEpropSetMeth(qqueue, sizeOnDiskMax, int64);
PROTOTYPEpropSetMeth(qqueue, iDeqBatchSize, int);
#define qqueueGetID(pThis) ((unsigned long) pThis)
#endif /* #ifndef QUEUE_H_INCLUDED */
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