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/*
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** 2008 June 18
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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**
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** This module implements the sqlite3_status() interface and related
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** functionality.
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**
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** $Id: status.c,v 1.7 2008/08/05 17:53:23 drh Exp $
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*/
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#include "sqliteInt.h"
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/*
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** Variables in which to record status information.
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*/
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static struct {
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int nowValue[9]; /* Current value */
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int mxValue[9]; /* Maximum value */
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} sqlite3Stat;
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/*
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** Reset the status records. This routine is called by
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** sqlite3_initialize().
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*/
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void sqlite3StatusReset(void){
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memset(&sqlite3Stat, 0, sizeof(sqlite3Stat));
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}
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/*
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** Return the current value of a status parameter.
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*/
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int sqlite3StatusValue(int op){
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assert( op>=0 && op<ArraySize(sqlite3Stat.nowValue) );
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return sqlite3Stat.nowValue[op];
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}
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/*
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** Add N to the value of a status record. It is assumed that the
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** caller holds appropriate locks.
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*/
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void sqlite3StatusAdd(int op, int N){
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assert( op>=0 && op<ArraySize(sqlite3Stat.nowValue) );
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sqlite3Stat.nowValue[op] += N;
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if( sqlite3Stat.nowValue[op]>sqlite3Stat.mxValue[op] ){
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sqlite3Stat.mxValue[op] = sqlite3Stat.nowValue[op];
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}
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}
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/*
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** Set the value of a status to X.
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*/
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void sqlite3StatusSet(int op, int X){
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assert( op>=0 && op<ArraySize(sqlite3Stat.nowValue) );
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sqlite3Stat.nowValue[op] = X;
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if( sqlite3Stat.nowValue[op]>sqlite3Stat.mxValue[op] ){
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sqlite3Stat.mxValue[op] = sqlite3Stat.nowValue[op];
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}
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}
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/*
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** Query status information.
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**
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** This implementation assumes that reading or writing an aligned
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** 32-bit integer is an atomic operation. If that assumption is not true,
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** then this routine is not threadsafe.
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*/
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int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetFlag){
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if( op<0 || op>=ArraySize(sqlite3Stat.nowValue) ){
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return SQLITE_MISUSE;
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}
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*pCurrent = sqlite3Stat.nowValue[op];
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*pHighwater = sqlite3Stat.mxValue[op];
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if( resetFlag ){
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sqlite3Stat.mxValue[op] = sqlite3Stat.nowValue[op];
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}
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return SQLITE_OK;
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}
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/*
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** Query status information for a single database connection
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*/
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int sqlite3_db_status(
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sqlite3 *db, /* The database connection whose status is desired */
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int op, /* Status verb */
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int *pCurrent, /* Write current value here */
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int *pHighwater, /* Write high-water mark here */
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int resetFlag /* Reset high-water mark if true */
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){
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switch( op ){
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case SQLITE_DBSTATUS_LOOKASIDE_USED: {
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*pCurrent = db->lookaside.nOut;
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*pHighwater = db->lookaside.mxOut;
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if( resetFlag ){
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db->lookaside.mxOut = db->lookaside.nOut;
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}
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break;
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}
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default: {
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return SQLITE_ERROR;
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}
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}
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return SQLITE_OK;
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}
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