summaryrefslogtreecommitdiffstats
path: root/queue.h
blob: a05c63413a4a6231e2efd2ae383827a11de4ae5e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
/* 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"
#include "wtp.h"
#include "stream.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_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;


typedef struct qWrkThrd_s {
	pthread_t thrdID;  /* thread ID */
	qWrkCmd_t tCurrCmd; /* current command to be carried out by worker */
	obj_t *pUsr;        /* current user object being processed (or NULL if none) */
	struct queue_s *pQueue; /* my queue (important if only the work thread instance is passed! */
	int iThrd;	/* my worker thread array index */
	pthread_cond_t condInitDone; /* signaled when the thread startup is done (once per thread existance) */
	pthread_mutex_t mut;
} qWrkThrd_t;	/* type for queue worker threads */

/* the queue object */
typedef struct queue_s {
	BEGINobjInstance;
	queueType_t	qType;
	int	bEnqOnly;	/* does queue run in enqueue-only mode (1) or not (0)? */
	int	bSaveOnShutdown;/* persists everthing on shutdown (if DA!)? 1-yes, 0-no */
	int	bQueueStarted;	/* has queueStart() been called on this queue? 1-yes, 0-no */
	int	bQueueInDestruction;/* 1 if queue is in destruction process, 0 otherwise */
	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;
	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 */
	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	iDiscardSeverity;/* messages of this severity above are discarded on too-full queue */
	int	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) */
	int	toEnq;		/* enqueue timeout */
	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 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 condDAReady;/* signalled when the DA queue is fully initialized and ready for processing */
	int bChildIsDone;		/* set to 1 when the child DA queue has finished processing, 0 otherwise */
	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? */
	size_t iMaxFileSize;	/* max size for a single queue file */
	int bIsDA;		/* is this queue disk assisted? */
	int bRunsDA;		/* is this queue actually *running* 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 head, tail;
			void** pBuf;		/* the queued user data structure */
		} farray;
		struct {
			qLinkedList_t *pRoot;
			qLinkedList_t *pLast;
		} linklist;
		struct {
			strm_t *pWrite; /* current file to be written */
			strm_t *pRead;  /* current file to be read */
		} disk;
	} tVars;
} queue_t;

/* some symbolic constants for easier reference */
#define QUEUE_MODE_ENQDEQ 0
#define QUEUE_MODE_ENQONLY 1

#define QUEUE_IDX_DA_WORKER 0 /* index for the DA worker (fixed) */
#define QUEUE_PTR_DA_WORKER(x) (&((pThis)->pWrkThrds[0]))

/* 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 queueDestruct(queue_t **ppThis);
rsRetVal queueEnqObj(queue_t *pThis, void *pUsr);
rsRetVal queueStart(queue_t *pThis);
rsRetVal queueSetMaxFileSize(queue_t *pThis, size_t iMaxFileSize);
rsRetVal queueSetFilePrefix(queue_t *pThis, uchar *pszPrefix, size_t iLenPrefix);
rsRetVal queueConstruct(queue_t **ppThis, queueType_t qType, int iWorkerThreads,
		        int iMaxQueueSize, rsRetVal (*pConsumer)(void*));
PROTOTYPEObjClassInit(queue);
PROTOTYPEpropSetMeth(queue, iPersistUpdCnt, int);
PROTOTYPEpropSetMeth(queue, toQShutdown, long);
PROTOTYPEpropSetMeth(queue, toActShutdown, long);
PROTOTYPEpropSetMeth(queue, toWrkShutdown, long);
PROTOTYPEpropSetMeth(queue, toEnq, long);
PROTOTYPEpropSetMeth(queue, iHighWtrMrk, int);
PROTOTYPEpropSetMeth(queue, iLowWtrMrk, int);
PROTOTYPEpropSetMeth(queue, iDiscardMrk, int);
PROTOTYPEpropSetMeth(queue, iDiscardSeverity, int);
PROTOTYPEpropSetMeth(queue, iMinMsgsPerWrkr, int);
PROTOTYPEpropSetMeth(queue, bSaveOnShutdown, int);
#define queueGetID(pThis) ((unsigned long) pThis)

#endif /* #ifndef QUEUE_H_INCLUDED */