|
sl@0
|
1 |
/*
|
|
sl@0
|
2 |
** 2008 June 18
|
|
sl@0
|
3 |
**
|
|
sl@0
|
4 |
** The author disclaims copyright to this source code. In place of
|
|
sl@0
|
5 |
** a legal notice, here is a blessing:
|
|
sl@0
|
6 |
**
|
|
sl@0
|
7 |
** May you do good and not evil.
|
|
sl@0
|
8 |
** May you find forgiveness for yourself and forgive others.
|
|
sl@0
|
9 |
** May you share freely, never taking more than you give.
|
|
sl@0
|
10 |
**
|
|
sl@0
|
11 |
*************************************************************************
|
|
sl@0
|
12 |
**
|
|
sl@0
|
13 |
** This module implements the sqlite3_status() interface and related
|
|
sl@0
|
14 |
** functionality.
|
|
sl@0
|
15 |
**
|
|
sl@0
|
16 |
** $Id: status.c,v 1.9 2008/09/02 00:52:52 drh Exp $
|
|
sl@0
|
17 |
*/
|
|
sl@0
|
18 |
#include "sqliteInt.h"
|
|
sl@0
|
19 |
|
|
sl@0
|
20 |
/*
|
|
sl@0
|
21 |
** Variables in which to record status information.
|
|
sl@0
|
22 |
*/
|
|
sl@0
|
23 |
typedef struct sqlite3StatType sqlite3StatType;
|
|
sl@0
|
24 |
static SQLITE_WSD struct sqlite3StatType {
|
|
sl@0
|
25 |
int nowValue[9]; /* Current value */
|
|
sl@0
|
26 |
int mxValue[9]; /* Maximum value */
|
|
sl@0
|
27 |
} sqlite3Stat = { {0,}, {0,} };
|
|
sl@0
|
28 |
|
|
sl@0
|
29 |
|
|
sl@0
|
30 |
/* The "wsdStat" macro will resolve to the status information
|
|
sl@0
|
31 |
** state vector. If writable static data is unsupported on the target,
|
|
sl@0
|
32 |
** we have to locate the state vector at run-time. In the more common
|
|
sl@0
|
33 |
** case where writable static data is supported, wsdStat can refer directly
|
|
sl@0
|
34 |
** to the "sqlite3Stat" state vector declared above.
|
|
sl@0
|
35 |
*/
|
|
sl@0
|
36 |
#ifdef SQLITE_OMIT_WSD
|
|
sl@0
|
37 |
# define wsdStatInit sqlite3StatType *x = &GLOBAL(sqlite3StatType,sqlite3Stat)
|
|
sl@0
|
38 |
# define wsdStat x[0]
|
|
sl@0
|
39 |
#else
|
|
sl@0
|
40 |
# define wsdStatInit
|
|
sl@0
|
41 |
# define wsdStat sqlite3Stat
|
|
sl@0
|
42 |
#endif
|
|
sl@0
|
43 |
|
|
sl@0
|
44 |
/*
|
|
sl@0
|
45 |
** Return the current value of a status parameter.
|
|
sl@0
|
46 |
*/
|
|
sl@0
|
47 |
int sqlite3StatusValue(int op){
|
|
sl@0
|
48 |
wsdStatInit;
|
|
sl@0
|
49 |
assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
|
|
sl@0
|
50 |
return wsdStat.nowValue[op];
|
|
sl@0
|
51 |
}
|
|
sl@0
|
52 |
|
|
sl@0
|
53 |
/*
|
|
sl@0
|
54 |
** Add N to the value of a status record. It is assumed that the
|
|
sl@0
|
55 |
** caller holds appropriate locks.
|
|
sl@0
|
56 |
*/
|
|
sl@0
|
57 |
void sqlite3StatusAdd(int op, int N){
|
|
sl@0
|
58 |
wsdStatInit;
|
|
sl@0
|
59 |
assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
|
|
sl@0
|
60 |
wsdStat.nowValue[op] += N;
|
|
sl@0
|
61 |
if( wsdStat.nowValue[op]>wsdStat.mxValue[op] ){
|
|
sl@0
|
62 |
wsdStat.mxValue[op] = wsdStat.nowValue[op];
|
|
sl@0
|
63 |
}
|
|
sl@0
|
64 |
}
|
|
sl@0
|
65 |
|
|
sl@0
|
66 |
/*
|
|
sl@0
|
67 |
** Set the value of a status to X.
|
|
sl@0
|
68 |
*/
|
|
sl@0
|
69 |
void sqlite3StatusSet(int op, int X){
|
|
sl@0
|
70 |
wsdStatInit;
|
|
sl@0
|
71 |
assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
|
|
sl@0
|
72 |
wsdStat.nowValue[op] = X;
|
|
sl@0
|
73 |
if( wsdStat.nowValue[op]>wsdStat.mxValue[op] ){
|
|
sl@0
|
74 |
wsdStat.mxValue[op] = wsdStat.nowValue[op];
|
|
sl@0
|
75 |
}
|
|
sl@0
|
76 |
}
|
|
sl@0
|
77 |
|
|
sl@0
|
78 |
/*
|
|
sl@0
|
79 |
** Query status information.
|
|
sl@0
|
80 |
**
|
|
sl@0
|
81 |
** This implementation assumes that reading or writing an aligned
|
|
sl@0
|
82 |
** 32-bit integer is an atomic operation. If that assumption is not true,
|
|
sl@0
|
83 |
** then this routine is not threadsafe.
|
|
sl@0
|
84 |
*/
|
|
sl@0
|
85 |
int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetFlag){
|
|
sl@0
|
86 |
wsdStatInit;
|
|
sl@0
|
87 |
if( op<0 || op>=ArraySize(wsdStat.nowValue) ){
|
|
sl@0
|
88 |
return SQLITE_MISUSE;
|
|
sl@0
|
89 |
}
|
|
sl@0
|
90 |
*pCurrent = wsdStat.nowValue[op];
|
|
sl@0
|
91 |
*pHighwater = wsdStat.mxValue[op];
|
|
sl@0
|
92 |
if( resetFlag ){
|
|
sl@0
|
93 |
wsdStat.mxValue[op] = wsdStat.nowValue[op];
|
|
sl@0
|
94 |
}
|
|
sl@0
|
95 |
return SQLITE_OK;
|
|
sl@0
|
96 |
}
|
|
sl@0
|
97 |
|
|
sl@0
|
98 |
/*
|
|
sl@0
|
99 |
** Query status information for a single database connection
|
|
sl@0
|
100 |
*/
|
|
sl@0
|
101 |
int sqlite3_db_status(
|
|
sl@0
|
102 |
sqlite3 *db, /* The database connection whose status is desired */
|
|
sl@0
|
103 |
int op, /* Status verb */
|
|
sl@0
|
104 |
int *pCurrent, /* Write current value here */
|
|
sl@0
|
105 |
int *pHighwater, /* Write high-water mark here */
|
|
sl@0
|
106 |
int resetFlag /* Reset high-water mark if true */
|
|
sl@0
|
107 |
){
|
|
sl@0
|
108 |
switch( op ){
|
|
sl@0
|
109 |
case SQLITE_DBSTATUS_LOOKASIDE_USED: {
|
|
sl@0
|
110 |
*pCurrent = db->lookaside.nOut;
|
|
sl@0
|
111 |
*pHighwater = db->lookaside.mxOut;
|
|
sl@0
|
112 |
if( resetFlag ){
|
|
sl@0
|
113 |
db->lookaside.mxOut = db->lookaside.nOut;
|
|
sl@0
|
114 |
}
|
|
sl@0
|
115 |
break;
|
|
sl@0
|
116 |
}
|
|
sl@0
|
117 |
default: {
|
|
sl@0
|
118 |
return SQLITE_ERROR;
|
|
sl@0
|
119 |
}
|
|
sl@0
|
120 |
}
|
|
sl@0
|
121 |
return SQLITE_OK;
|
|
sl@0
|
122 |
}
|