mirror of
https://github.com/DBD-SQLite/DBD-SQLite
synced 2025-06-07 14:19:10 -04:00
122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
/*
|
|
** 2008 June 18
|
|
**
|
|
** The author disclaims copyright to this source code. In place of
|
|
** a legal notice, here is a blessing:
|
|
**
|
|
** May you do good and not evil.
|
|
** May you find forgiveness for yourself and forgive others.
|
|
** May you share freely, never taking more than you give.
|
|
**
|
|
*************************************************************************
|
|
**
|
|
** This module implements the sqlite3_status() interface and related
|
|
** functionality.
|
|
**
|
|
** $Id: status.c,v 1.9 2008/09/02 00:52:52 drh Exp $
|
|
*/
|
|
#include "sqliteInt.h"
|
|
|
|
/*
|
|
** Variables in which to record status information.
|
|
*/
|
|
typedef struct sqlite3StatType sqlite3StatType;
|
|
static SQLITE_WSD struct sqlite3StatType {
|
|
int nowValue[9]; /* Current value */
|
|
int mxValue[9]; /* Maximum value */
|
|
} sqlite3Stat = { {0,}, {0,} };
|
|
|
|
|
|
/* The "wsdStat" macro will resolve to the status information
|
|
** state vector. If writable static data is unsupported on the target,
|
|
** we have to locate the state vector at run-time. In the more common
|
|
** case where writable static data is supported, wsdStat can refer directly
|
|
** to the "sqlite3Stat" state vector declared above.
|
|
*/
|
|
#ifdef SQLITE_OMIT_WSD
|
|
# define wsdStatInit sqlite3StatType *x = &GLOBAL(sqlite3StatType,sqlite3Stat)
|
|
# define wsdStat x[0]
|
|
#else
|
|
# define wsdStatInit
|
|
# define wsdStat sqlite3Stat
|
|
#endif
|
|
|
|
/*
|
|
** Return the current value of a status parameter.
|
|
*/
|
|
int sqlite3StatusValue(int op){
|
|
wsdStatInit;
|
|
assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
|
|
return wsdStat.nowValue[op];
|
|
}
|
|
|
|
/*
|
|
** Add N to the value of a status record. It is assumed that the
|
|
** caller holds appropriate locks.
|
|
*/
|
|
void sqlite3StatusAdd(int op, int N){
|
|
wsdStatInit;
|
|
assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
|
|
wsdStat.nowValue[op] += N;
|
|
if( wsdStat.nowValue[op]>wsdStat.mxValue[op] ){
|
|
wsdStat.mxValue[op] = wsdStat.nowValue[op];
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Set the value of a status to X.
|
|
*/
|
|
void sqlite3StatusSet(int op, int X){
|
|
wsdStatInit;
|
|
assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
|
|
wsdStat.nowValue[op] = X;
|
|
if( wsdStat.nowValue[op]>wsdStat.mxValue[op] ){
|
|
wsdStat.mxValue[op] = wsdStat.nowValue[op];
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Query status information.
|
|
**
|
|
** This implementation assumes that reading or writing an aligned
|
|
** 32-bit integer is an atomic operation. If that assumption is not true,
|
|
** then this routine is not threadsafe.
|
|
*/
|
|
int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetFlag){
|
|
wsdStatInit;
|
|
if( op<0 || op>=ArraySize(wsdStat.nowValue) ){
|
|
return SQLITE_MISUSE;
|
|
}
|
|
*pCurrent = wsdStat.nowValue[op];
|
|
*pHighwater = wsdStat.mxValue[op];
|
|
if( resetFlag ){
|
|
wsdStat.mxValue[op] = wsdStat.nowValue[op];
|
|
}
|
|
return SQLITE_OK;
|
|
}
|
|
|
|
/*
|
|
** Query status information for a single database connection
|
|
*/
|
|
int sqlite3_db_status(
|
|
sqlite3 *db, /* The database connection whose status is desired */
|
|
int op, /* Status verb */
|
|
int *pCurrent, /* Write current value here */
|
|
int *pHighwater, /* Write high-water mark here */
|
|
int resetFlag /* Reset high-water mark if true */
|
|
){
|
|
switch( op ){
|
|
case SQLITE_DBSTATUS_LOOKASIDE_USED: {
|
|
*pCurrent = db->lookaside.nOut;
|
|
*pHighwater = db->lookaside.mxOut;
|
|
if( resetFlag ){
|
|
db->lookaside.mxOut = db->lookaside.nOut;
|
|
}
|
|
break;
|
|
}
|
|
default: {
|
|
return SQLITE_ERROR;
|
|
}
|
|
}
|
|
return SQLITE_OK;
|
|
}
|